472dfe74b3
This removes the `Primitive::{bits, bytes, is_signed}` methods and removes the operator trait constraints, for the reasons outlined below:
- The `Primitive::{bits, bytes}` associated functions were originally added to reflect the existing `BITS` and `BYTES` statics included in the numeric modules. These statics are only exist as a workaround for Rust's lack of CTFE, and should probably be deprecated in the future in favor of using the `std::mem::size_of` function (see #11621).
- `Primitive::is_signed` seems to be of little utility and does not seem to be used anywhere in the Rust compiler or libraries. It is also rather ugly to call due to the `Option<Self>` workaround for #8888.
- The operator trait constraints are already covered by the `Num` trait.
1627 lines
58 KiB
Rust
1627 lines
58 KiB
Rust
// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution and at
|
|
// http://rust-lang.org/COPYRIGHT.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
//! Numeric traits and functions for generic mathematics
|
|
//!
|
|
//! These are implemented for the primitive numeric types in `std::{u8, u16,
|
|
//! u32, u64, uint, i8, i16, i32, i64, int, f32, f64, float}`.
|
|
|
|
#[allow(missing_doc)];
|
|
|
|
use clone::{Clone, DeepClone};
|
|
use cmp::{Eq, Ord};
|
|
use mem::size_of;
|
|
use ops::{Add, Sub, Mul, Div, Rem, Neg};
|
|
use ops::{Not, BitAnd, BitOr, BitXor, Shl, Shr};
|
|
use option::{Option, Some, None};
|
|
|
|
pub mod strconv;
|
|
|
|
/// The base trait for numeric types
|
|
pub trait Num: Eq + Zero + One
|
|
+ Neg<Self>
|
|
+ Add<Self,Self>
|
|
+ Sub<Self,Self>
|
|
+ Mul<Self,Self>
|
|
+ Div<Self,Self>
|
|
+ Rem<Self,Self> {}
|
|
|
|
pub trait Orderable: Ord {
|
|
// These should be methods on `Ord`, with overridable default implementations. We don't want
|
|
// to encumber all implementors of Ord by requiring them to implement these functions, but at
|
|
// the same time we want to be able to take advantage of the speed of the specific numeric
|
|
// functions (like the `fmin` and `fmax` intrinsics).
|
|
fn min(&self, other: &Self) -> Self;
|
|
fn max(&self, other: &Self) -> Self;
|
|
fn clamp(&self, mn: &Self, mx: &Self) -> Self;
|
|
}
|
|
|
|
/// Return the smaller number.
|
|
#[inline(always)] pub fn min<T: Orderable>(x: T, y: T) -> T { x.min(&y) }
|
|
/// Return the larger number.
|
|
#[inline(always)] pub fn max<T: Orderable>(x: T, y: T) -> T { x.max(&y) }
|
|
/// Returns the number constrained within the range `mn <= self <= mx`.
|
|
#[inline(always)] pub fn clamp<T: Orderable>(value: T, mn: T, mx: T) -> T { value.clamp(&mn, &mx) }
|
|
|
|
pub trait Zero {
|
|
fn zero() -> Self; // FIXME (#5527): This should be an associated constant
|
|
fn is_zero(&self) -> bool;
|
|
}
|
|
|
|
/// Returns `0` of appropriate type.
|
|
#[inline(always)] pub fn zero<T: Zero>() -> T { Zero::zero() }
|
|
|
|
pub trait One {
|
|
fn one() -> Self; // FIXME (#5527): This should be an associated constant
|
|
}
|
|
|
|
/// Returns `1` of appropriate type.
|
|
#[inline(always)] pub fn one<T: One>() -> T { One::one() }
|
|
|
|
pub trait Signed: Num
|
|
+ Neg<Self> {
|
|
fn abs(&self) -> Self;
|
|
fn abs_sub(&self, other: &Self) -> Self;
|
|
fn signum(&self) -> Self;
|
|
|
|
fn is_positive(&self) -> bool;
|
|
fn is_negative(&self) -> bool;
|
|
}
|
|
|
|
/// Computes the absolute value.
|
|
///
|
|
/// For float, f32, and f64, `NaN` will be returned if the number is `NaN`
|
|
#[inline(always)] pub fn abs<T: Signed>(value: T) -> T { value.abs() }
|
|
/// The positive difference of two numbers.
|
|
///
|
|
/// Returns `zero` if the number is less than or equal to `other`,
|
|
/// otherwise the difference between `self` and `other` is returned.
|
|
#[inline(always)] pub fn abs_sub<T: Signed>(x: T, y: T) -> T { x.abs_sub(&y) }
|
|
/// Returns the sign of the number.
|
|
///
|
|
/// For float, f32, f64:
|
|
/// - `1.0` if the number is positive, `+0.0` or `INFINITY`
|
|
/// - `-1.0` if the number is negative, `-0.0` or `NEG_INFINITY`
|
|
/// - `NAN` if the number is `NAN`
|
|
///
|
|
/// For int:
|
|
/// - `0` if the number is zero
|
|
/// - `1` if the number is positive
|
|
/// - `-1` if the number is negative
|
|
#[inline(always)] pub fn signum<T: Signed>(value: T) -> T { value.signum() }
|
|
|
|
pub trait Unsigned: Num {}
|
|
|
|
/// Times trait
|
|
///
|
|
/// ```rust
|
|
/// let ten = 10u;
|
|
/// let mut accum = 0;
|
|
/// ten.times(|| { accum += 1; })
|
|
/// ```
|
|
///
|
|
pub trait Times {
|
|
fn times(&self, it: ||);
|
|
}
|
|
|
|
pub trait Integer: Num
|
|
+ Orderable
|
|
+ Div<Self,Self>
|
|
+ Rem<Self,Self> {
|
|
fn div_rem(&self, other: &Self) -> (Self,Self);
|
|
|
|
fn div_floor(&self, other: &Self) -> Self;
|
|
fn mod_floor(&self, other: &Self) -> Self;
|
|
fn div_mod_floor(&self, other: &Self) -> (Self,Self);
|
|
|
|
fn gcd(&self, other: &Self) -> Self;
|
|
fn lcm(&self, other: &Self) -> Self;
|
|
|
|
fn is_multiple_of(&self, other: &Self) -> bool;
|
|
fn is_even(&self) -> bool;
|
|
fn is_odd(&self) -> bool;
|
|
}
|
|
|
|
/// Calculates the Greatest Common Divisor (GCD) of the number and `other`.
|
|
///
|
|
/// The result is always positive.
|
|
#[inline(always)] pub fn gcd<T: Integer>(x: T, y: T) -> T { x.gcd(&y) }
|
|
/// Calculates the Lowest Common Multiple (LCM) of the number and `other`.
|
|
#[inline(always)] pub fn lcm<T: Integer>(x: T, y: T) -> T { x.lcm(&y) }
|
|
|
|
/// A collection of rounding operations.
|
|
pub trait Round {
|
|
/// Return the largest integer less than or equal to a number.
|
|
fn floor(&self) -> Self;
|
|
|
|
/// Return the smallest integer greater than or equal to a number.
|
|
fn ceil(&self) -> Self;
|
|
|
|
/// Return the nearest integer to a number. Round half-way cases away from
|
|
/// `0.0`.
|
|
fn round(&self) -> Self;
|
|
|
|
/// Return the integer part of a number.
|
|
fn trunc(&self) -> Self;
|
|
|
|
/// Return the fractional part of a number.
|
|
fn fract(&self) -> Self;
|
|
}
|
|
|
|
/// Defines constants and methods common to real numbers
|
|
pub trait Real: Signed
|
|
+ Orderable
|
|
+ Round
|
|
+ Div<Self,Self> {
|
|
// Common Constants
|
|
// FIXME (#5527): These should be associated constants
|
|
fn pi() -> Self;
|
|
fn two_pi() -> Self;
|
|
fn frac_pi_2() -> Self;
|
|
fn frac_pi_3() -> Self;
|
|
fn frac_pi_4() -> Self;
|
|
fn frac_pi_6() -> Self;
|
|
fn frac_pi_8() -> Self;
|
|
fn frac_1_pi() -> Self;
|
|
fn frac_2_pi() -> Self;
|
|
fn frac_2_sqrtpi() -> Self;
|
|
fn sqrt2() -> Self;
|
|
fn frac_1_sqrt2() -> Self;
|
|
fn e() -> Self;
|
|
fn log2_e() -> Self;
|
|
fn log10_e() -> Self;
|
|
fn ln_2() -> Self;
|
|
fn ln_10() -> Self;
|
|
|
|
// Fractional functions
|
|
|
|
/// Take the reciprocal (inverse) of a number, `1/x`.
|
|
fn recip(&self) -> Self;
|
|
|
|
// Algebraic functions
|
|
|
|
/// Raise a number to a power.
|
|
fn pow(&self, n: &Self) -> Self;
|
|
/// Take the square root of a number.
|
|
fn sqrt(&self) -> Self;
|
|
/// Take the reciprocal (inverse) square root of a number, `1/sqrt(x)`.
|
|
fn rsqrt(&self) -> Self;
|
|
/// Take the cubic root of a number.
|
|
fn cbrt(&self) -> Self;
|
|
/// Calculate the length of the hypotenuse of a right-angle triangle given
|
|
/// legs of length `x` and `y`.
|
|
fn hypot(&self, other: &Self) -> Self;
|
|
|
|
// Trigonometric functions
|
|
|
|
/// Computes the sine of a number (in radians).
|
|
fn sin(&self) -> Self;
|
|
/// Computes the cosine of a number (in radians).
|
|
fn cos(&self) -> Self;
|
|
/// Computes the tangent of a number (in radians).
|
|
fn tan(&self) -> Self;
|
|
|
|
/// Computes the arcsine of a number. Return value is in radians in
|
|
/// the range [-pi/2, pi/2] or NaN if the number is outside the range
|
|
/// [-1, 1].
|
|
fn asin(&self) -> Self;
|
|
/// Computes the arccosine of a number. Return value is in radians in
|
|
/// the range [0, pi] or NaN if the number is outside the range
|
|
/// [-1, 1].
|
|
fn acos(&self) -> Self;
|
|
/// Computes the arctangent of a number. Return value is in radians in the
|
|
/// range [-pi/2, pi/2];
|
|
fn atan(&self) -> Self;
|
|
/// Computes the four quadrant arctangent of a number, `y`, and another
|
|
/// number `x`. Return value is in radians in the range [-pi, pi].
|
|
fn atan2(&self, other: &Self) -> Self;
|
|
/// Simultaneously computes the sine and cosine of the number, `x`. Returns
|
|
/// `(sin(x), cos(x))`.
|
|
fn sin_cos(&self) -> (Self, Self);
|
|
|
|
// Exponential functions
|
|
|
|
/// Returns `e^(self)`, (the exponential function).
|
|
fn exp(&self) -> Self;
|
|
/// Returns 2 raised to the power of the number, `2^(self)`.
|
|
fn exp2(&self) -> Self;
|
|
/// Returns the natural logarithm of the number.
|
|
fn ln(&self) -> Self;
|
|
/// Returns the logarithm of the number with respect to an arbitrary base.
|
|
fn log(&self, base: &Self) -> Self;
|
|
/// Returns the base 2 logarithm of the number.
|
|
fn log2(&self) -> Self;
|
|
/// Returns the base 10 logarithm of the number.
|
|
fn log10(&self) -> Self;
|
|
|
|
// Hyperbolic functions
|
|
|
|
/// Hyperbolic sine function.
|
|
fn sinh(&self) -> Self;
|
|
/// Hyperbolic cosine function.
|
|
fn cosh(&self) -> Self;
|
|
/// Hyperbolic tangent function.
|
|
fn tanh(&self) -> Self;
|
|
/// Inverse hyperbolic sine function.
|
|
fn asinh(&self) -> Self;
|
|
/// Inverse hyperbolic cosine function.
|
|
fn acosh(&self) -> Self;
|
|
/// Inverse hyperbolic tangent function.
|
|
fn atanh(&self) -> Self;
|
|
|
|
// Angular conversions
|
|
|
|
/// Convert radians to degrees.
|
|
fn to_degrees(&self) -> Self;
|
|
/// Convert degrees to radians.
|
|
fn to_radians(&self) -> Self;
|
|
}
|
|
|
|
/// Raise a number to a power.
|
|
///
|
|
/// # Example
|
|
///
|
|
/// ```rust
|
|
/// use std::num;
|
|
///
|
|
/// let sixteen: f64 = num::pow(2.0, 4.0);
|
|
/// assert_eq!(sixteen, 16.0);
|
|
/// ```
|
|
#[inline(always)] pub fn pow<T: Real>(value: T, n: T) -> T { value.pow(&n) }
|
|
/// Take the square root of a number.
|
|
#[inline(always)] pub fn sqrt<T: Real>(value: T) -> T { value.sqrt() }
|
|
/// Take the reciprocal (inverse) square root of a number, `1/sqrt(x)`.
|
|
#[inline(always)] pub fn rsqrt<T: Real>(value: T) -> T { value.rsqrt() }
|
|
/// Take the cubic root of a number.
|
|
#[inline(always)] pub fn cbrt<T: Real>(value: T) -> T { value.cbrt() }
|
|
/// Calculate the length of the hypotenuse of a right-angle triangle given legs of length `x` and
|
|
/// `y`.
|
|
#[inline(always)] pub fn hypot<T: Real>(x: T, y: T) -> T { x.hypot(&y) }
|
|
/// Sine function.
|
|
#[inline(always)] pub fn sin<T: Real>(value: T) -> T { value.sin() }
|
|
/// Cosine function.
|
|
#[inline(always)] pub fn cos<T: Real>(value: T) -> T { value.cos() }
|
|
/// Tangent function.
|
|
#[inline(always)] pub fn tan<T: Real>(value: T) -> T { value.tan() }
|
|
/// Compute the arcsine of the number.
|
|
#[inline(always)] pub fn asin<T: Real>(value: T) -> T { value.asin() }
|
|
/// Compute the arccosine of the number.
|
|
#[inline(always)] pub fn acos<T: Real>(value: T) -> T { value.acos() }
|
|
/// Compute the arctangent of the number.
|
|
#[inline(always)] pub fn atan<T: Real>(value: T) -> T { value.atan() }
|
|
/// Compute the arctangent with 2 arguments.
|
|
#[inline(always)] pub fn atan2<T: Real>(x: T, y: T) -> T { x.atan2(&y) }
|
|
/// Simultaneously computes the sine and cosine of the number.
|
|
#[inline(always)] pub fn sin_cos<T: Real>(value: T) -> (T, T) { value.sin_cos() }
|
|
/// Returns `e^(value)`, (the exponential function).
|
|
#[inline(always)] pub fn exp<T: Real>(value: T) -> T { value.exp() }
|
|
/// Returns 2 raised to the power of the number, `2^(value)`.
|
|
#[inline(always)] pub fn exp2<T: Real>(value: T) -> T { value.exp2() }
|
|
/// Returns the natural logarithm of the number.
|
|
#[inline(always)] pub fn ln<T: Real>(value: T) -> T { value.ln() }
|
|
/// Returns the logarithm of the number with respect to an arbitrary base.
|
|
#[inline(always)] pub fn log<T: Real>(value: T, base: T) -> T { value.log(&base) }
|
|
/// Returns the base 2 logarithm of the number.
|
|
#[inline(always)] pub fn log2<T: Real>(value: T) -> T { value.log2() }
|
|
/// Returns the base 10 logarithm of the number.
|
|
#[inline(always)] pub fn log10<T: Real>(value: T) -> T { value.log10() }
|
|
/// Hyperbolic sine function.
|
|
#[inline(always)] pub fn sinh<T: Real>(value: T) -> T { value.sinh() }
|
|
/// Hyperbolic cosine function.
|
|
#[inline(always)] pub fn cosh<T: Real>(value: T) -> T { value.cosh() }
|
|
/// Hyperbolic tangent function.
|
|
#[inline(always)] pub fn tanh<T: Real>(value: T) -> T { value.tanh() }
|
|
/// Inverse hyperbolic sine function.
|
|
#[inline(always)] pub fn asinh<T: Real>(value: T) -> T { value.asinh() }
|
|
/// Inverse hyperbolic cosine function.
|
|
#[inline(always)] pub fn acosh<T: Real>(value: T) -> T { value.acosh() }
|
|
/// Inverse hyperbolic tangent function.
|
|
#[inline(always)] pub fn atanh<T: Real>(value: T) -> T { value.atanh() }
|
|
|
|
pub trait Bounded {
|
|
// FIXME (#5527): These should be associated constants
|
|
fn min_value() -> Self;
|
|
fn max_value() -> Self;
|
|
}
|
|
|
|
/// Numbers with a fixed binary representation.
|
|
pub trait Bitwise: Bounded
|
|
+ Not<Self>
|
|
+ BitAnd<Self,Self>
|
|
+ BitOr<Self,Self>
|
|
+ BitXor<Self,Self>
|
|
+ Shl<Self,Self>
|
|
+ Shr<Self,Self> {
|
|
/// Returns the number of bits set in the number.
|
|
///
|
|
/// # Example
|
|
///
|
|
/// ```rust
|
|
/// use std::num::Bitwise;
|
|
///
|
|
/// let n = 0b0101000u16;
|
|
/// assert_eq!(n.population_count(), 2);
|
|
/// ```
|
|
fn population_count(&self) -> Self;
|
|
/// Returns the number of leading zeros in the number.
|
|
///
|
|
/// # Example
|
|
///
|
|
/// ```rust
|
|
/// use std::num::Bitwise;
|
|
///
|
|
/// let n = 0b0101000u16;
|
|
/// assert_eq!(n.leading_zeros(), 10);
|
|
/// ```
|
|
fn leading_zeros(&self) -> Self;
|
|
/// Returns the number of trailing zeros in the number.
|
|
///
|
|
/// # Example
|
|
///
|
|
/// ```rust
|
|
/// use std::num::Bitwise;
|
|
///
|
|
/// let n = 0b0101000u16;
|
|
/// assert_eq!(n.trailing_zeros(), 3);
|
|
/// ```
|
|
fn trailing_zeros(&self) -> Self;
|
|
}
|
|
|
|
/// Specifies the available operations common to all of Rust's core numeric primitives.
|
|
/// These may not always make sense from a purely mathematical point of view, but
|
|
/// may be useful for systems programming.
|
|
pub trait Primitive: Clone
|
|
+ DeepClone
|
|
+ Num
|
|
+ NumCast
|
|
+ Orderable
|
|
+ Bounded {}
|
|
|
|
/// A collection of traits relevant to primitive signed and unsigned integers
|
|
pub trait Int: Integer
|
|
+ Primitive
|
|
+ Bitwise {}
|
|
|
|
/// Used for representing the classification of floating point numbers
|
|
#[deriving(Eq)]
|
|
pub enum FPCategory {
|
|
/// "Not a Number", often obtained by dividing by zero
|
|
FPNaN,
|
|
/// Positive or negative infinity
|
|
FPInfinite ,
|
|
/// Positive or negative zero
|
|
FPZero,
|
|
/// De-normalized floating point representation (less precise than `FPNormal`)
|
|
FPSubnormal,
|
|
/// A regular floating point number
|
|
FPNormal,
|
|
}
|
|
|
|
/// Primitive floating point numbers
|
|
pub trait Float: Real
|
|
+ Signed
|
|
+ Primitive {
|
|
// FIXME (#5527): These should be associated constants
|
|
fn nan() -> Self;
|
|
fn infinity() -> Self;
|
|
fn neg_infinity() -> Self;
|
|
fn neg_zero() -> Self;
|
|
|
|
fn is_nan(&self) -> bool;
|
|
fn is_infinite(&self) -> bool;
|
|
fn is_finite(&self) -> bool;
|
|
fn is_normal(&self) -> bool;
|
|
fn classify(&self) -> FPCategory;
|
|
|
|
// FIXME (#8888): Removing `unused_self` requires #8888 to be fixed.
|
|
fn mantissa_digits(unused_self: Option<Self>) -> uint;
|
|
fn digits(unused_self: Option<Self>) -> uint;
|
|
fn epsilon() -> Self;
|
|
fn min_exp(unused_self: Option<Self>) -> int;
|
|
fn max_exp(unused_self: Option<Self>) -> int;
|
|
fn min_10_exp(unused_self: Option<Self>) -> int;
|
|
fn max_10_exp(unused_self: Option<Self>) -> int;
|
|
|
|
fn ldexp(x: Self, exp: int) -> Self;
|
|
fn frexp(&self) -> (Self, int);
|
|
|
|
fn exp_m1(&self) -> Self;
|
|
fn ln_1p(&self) -> Self;
|
|
fn mul_add(&self, a: Self, b: Self) -> Self;
|
|
fn next_after(&self, other: Self) -> Self;
|
|
|
|
fn integer_decode(&self) -> (u64, i16, i8);
|
|
}
|
|
|
|
/// Returns the exponential of the number, minus `1`, `exp(n) - 1`, in a way
|
|
/// that is accurate even if the number is close to zero.
|
|
#[inline(always)] pub fn exp_m1<T: Float>(value: T) -> T { value.exp_m1() }
|
|
/// Returns the natural logarithm of the number plus `1`, `ln(n + 1)`, more
|
|
/// accurately than if the operations were performed separately.
|
|
#[inline(always)] pub fn ln_1p<T: Float>(value: T) -> T { value.ln_1p() }
|
|
/// Fused multiply-add. Computes `(a * b) + c` with only one rounding error.
|
|
///
|
|
/// This produces a more accurate result with better performance (on some
|
|
/// architectures) than a separate multiplication operation followed by an add.
|
|
#[inline(always)] pub fn mul_add<T: Float>(a: T, b: T, c: T) -> T { a.mul_add(b, c) }
|
|
|
|
/// A generic trait for converting a value to a number.
|
|
pub trait ToPrimitive {
|
|
/// Converts the value of `self` to an `int`.
|
|
#[inline]
|
|
fn to_int(&self) -> Option<int> {
|
|
self.to_i64().and_then(|x| x.to_int())
|
|
}
|
|
|
|
/// Converts the value of `self` to an `i8`.
|
|
#[inline]
|
|
fn to_i8(&self) -> Option<i8> {
|
|
self.to_i64().and_then(|x| x.to_i8())
|
|
}
|
|
|
|
/// Converts the value of `self` to an `i16`.
|
|
#[inline]
|
|
fn to_i16(&self) -> Option<i16> {
|
|
self.to_i64().and_then(|x| x.to_i16())
|
|
}
|
|
|
|
/// Converts the value of `self` to an `i32`.
|
|
#[inline]
|
|
fn to_i32(&self) -> Option<i32> {
|
|
self.to_i64().and_then(|x| x.to_i32())
|
|
}
|
|
|
|
/// Converts the value of `self` to an `i64`.
|
|
fn to_i64(&self) -> Option<i64>;
|
|
|
|
/// Converts the value of `self` to an `uint`.
|
|
#[inline]
|
|
fn to_uint(&self) -> Option<uint> {
|
|
self.to_u64().and_then(|x| x.to_uint())
|
|
}
|
|
|
|
/// Converts the value of `self` to an `u8`.
|
|
#[inline]
|
|
fn to_u8(&self) -> Option<u8> {
|
|
self.to_u64().and_then(|x| x.to_u8())
|
|
}
|
|
|
|
/// Converts the value of `self` to an `u16`.
|
|
#[inline]
|
|
fn to_u16(&self) -> Option<u16> {
|
|
self.to_u64().and_then(|x| x.to_u16())
|
|
}
|
|
|
|
/// Converts the value of `self` to an `u32`.
|
|
#[inline]
|
|
fn to_u32(&self) -> Option<u32> {
|
|
self.to_u64().and_then(|x| x.to_u32())
|
|
}
|
|
|
|
/// Converts the value of `self` to an `u64`.
|
|
#[inline]
|
|
fn to_u64(&self) -> Option<u64>;
|
|
|
|
/// Converts the value of `self` to an `f32`.
|
|
#[inline]
|
|
fn to_f32(&self) -> Option<f32> {
|
|
self.to_f64().and_then(|x| x.to_f32())
|
|
}
|
|
|
|
/// Converts the value of `self` to an `f64`.
|
|
#[inline]
|
|
fn to_f64(&self) -> Option<f64> {
|
|
self.to_i64().and_then(|x| x.to_f64())
|
|
}
|
|
}
|
|
|
|
macro_rules! impl_to_primitive_int_to_int(
|
|
($SrcT:ty, $DstT:ty) => (
|
|
{
|
|
if size_of::<$SrcT>() <= size_of::<$DstT>() {
|
|
Some(*self as $DstT)
|
|
} else {
|
|
let n = *self as i64;
|
|
let min_value: $DstT = Bounded::min_value();
|
|
let max_value: $DstT = Bounded::max_value();
|
|
if min_value as i64 <= n && n <= max_value as i64 {
|
|
Some(*self as $DstT)
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
}
|
|
)
|
|
)
|
|
|
|
macro_rules! impl_to_primitive_int_to_uint(
|
|
($SrcT:ty, $DstT:ty) => (
|
|
{
|
|
let zero: $SrcT = Zero::zero();
|
|
let max_value: $DstT = Bounded::max_value();
|
|
if zero <= *self && *self as u64 <= max_value as u64 {
|
|
Some(*self as $DstT)
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
)
|
|
)
|
|
|
|
macro_rules! impl_to_primitive_int(
|
|
($T:ty) => (
|
|
impl ToPrimitive for $T {
|
|
#[inline]
|
|
fn to_int(&self) -> Option<int> { impl_to_primitive_int_to_int!($T, int) }
|
|
#[inline]
|
|
fn to_i8(&self) -> Option<i8> { impl_to_primitive_int_to_int!($T, i8) }
|
|
#[inline]
|
|
fn to_i16(&self) -> Option<i16> { impl_to_primitive_int_to_int!($T, i16) }
|
|
#[inline]
|
|
fn to_i32(&self) -> Option<i32> { impl_to_primitive_int_to_int!($T, i32) }
|
|
#[inline]
|
|
fn to_i64(&self) -> Option<i64> { impl_to_primitive_int_to_int!($T, i64) }
|
|
|
|
#[inline]
|
|
fn to_uint(&self) -> Option<uint> { impl_to_primitive_int_to_uint!($T, uint) }
|
|
#[inline]
|
|
fn to_u8(&self) -> Option<u8> { impl_to_primitive_int_to_uint!($T, u8) }
|
|
#[inline]
|
|
fn to_u16(&self) -> Option<u16> { impl_to_primitive_int_to_uint!($T, u16) }
|
|
#[inline]
|
|
fn to_u32(&self) -> Option<u32> { impl_to_primitive_int_to_uint!($T, u32) }
|
|
#[inline]
|
|
fn to_u64(&self) -> Option<u64> { impl_to_primitive_int_to_uint!($T, u64) }
|
|
|
|
#[inline]
|
|
fn to_f32(&self) -> Option<f32> { Some(*self as f32) }
|
|
#[inline]
|
|
fn to_f64(&self) -> Option<f64> { Some(*self as f64) }
|
|
}
|
|
)
|
|
)
|
|
|
|
impl_to_primitive_int!(int)
|
|
impl_to_primitive_int!(i8)
|
|
impl_to_primitive_int!(i16)
|
|
impl_to_primitive_int!(i32)
|
|
impl_to_primitive_int!(i64)
|
|
|
|
macro_rules! impl_to_primitive_uint_to_int(
|
|
($DstT:ty) => (
|
|
{
|
|
let max_value: $DstT = Bounded::max_value();
|
|
if *self as u64 <= max_value as u64 {
|
|
Some(*self as $DstT)
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
)
|
|
)
|
|
|
|
macro_rules! impl_to_primitive_uint_to_uint(
|
|
($SrcT:ty, $DstT:ty) => (
|
|
{
|
|
if size_of::<$SrcT>() <= size_of::<$DstT>() {
|
|
Some(*self as $DstT)
|
|
} else {
|
|
let zero: $SrcT = Zero::zero();
|
|
let max_value: $DstT = Bounded::max_value();
|
|
if zero <= *self && *self as u64 <= max_value as u64 {
|
|
Some(*self as $DstT)
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
}
|
|
)
|
|
)
|
|
|
|
macro_rules! impl_to_primitive_uint(
|
|
($T:ty) => (
|
|
impl ToPrimitive for $T {
|
|
#[inline]
|
|
fn to_int(&self) -> Option<int> { impl_to_primitive_uint_to_int!(int) }
|
|
#[inline]
|
|
fn to_i8(&self) -> Option<i8> { impl_to_primitive_uint_to_int!(i8) }
|
|
#[inline]
|
|
fn to_i16(&self) -> Option<i16> { impl_to_primitive_uint_to_int!(i16) }
|
|
#[inline]
|
|
fn to_i32(&self) -> Option<i32> { impl_to_primitive_uint_to_int!(i32) }
|
|
#[inline]
|
|
fn to_i64(&self) -> Option<i64> { impl_to_primitive_uint_to_int!(i64) }
|
|
|
|
#[inline]
|
|
fn to_uint(&self) -> Option<uint> { impl_to_primitive_uint_to_uint!($T, uint) }
|
|
#[inline]
|
|
fn to_u8(&self) -> Option<u8> { impl_to_primitive_uint_to_uint!($T, u8) }
|
|
#[inline]
|
|
fn to_u16(&self) -> Option<u16> { impl_to_primitive_uint_to_uint!($T, u16) }
|
|
#[inline]
|
|
fn to_u32(&self) -> Option<u32> { impl_to_primitive_uint_to_uint!($T, u32) }
|
|
#[inline]
|
|
fn to_u64(&self) -> Option<u64> { impl_to_primitive_uint_to_uint!($T, u64) }
|
|
|
|
#[inline]
|
|
fn to_f32(&self) -> Option<f32> { Some(*self as f32) }
|
|
#[inline]
|
|
fn to_f64(&self) -> Option<f64> { Some(*self as f64) }
|
|
}
|
|
)
|
|
)
|
|
|
|
impl_to_primitive_uint!(uint)
|
|
impl_to_primitive_uint!(u8)
|
|
impl_to_primitive_uint!(u16)
|
|
impl_to_primitive_uint!(u32)
|
|
impl_to_primitive_uint!(u64)
|
|
|
|
macro_rules! impl_to_primitive_float_to_float(
|
|
($SrcT:ty, $DstT:ty) => (
|
|
if size_of::<$SrcT>() <= size_of::<$DstT>() {
|
|
Some(*self as $DstT)
|
|
} else {
|
|
let n = *self as f64;
|
|
let max_value: $SrcT = Bounded::max_value();
|
|
if -max_value as f64 <= n && n <= max_value as f64 {
|
|
Some(*self as $DstT)
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
)
|
|
)
|
|
|
|
macro_rules! impl_to_primitive_float(
|
|
($T:ty) => (
|
|
impl ToPrimitive for $T {
|
|
#[inline]
|
|
fn to_int(&self) -> Option<int> { Some(*self as int) }
|
|
#[inline]
|
|
fn to_i8(&self) -> Option<i8> { Some(*self as i8) }
|
|
#[inline]
|
|
fn to_i16(&self) -> Option<i16> { Some(*self as i16) }
|
|
#[inline]
|
|
fn to_i32(&self) -> Option<i32> { Some(*self as i32) }
|
|
#[inline]
|
|
fn to_i64(&self) -> Option<i64> { Some(*self as i64) }
|
|
|
|
#[inline]
|
|
fn to_uint(&self) -> Option<uint> { Some(*self as uint) }
|
|
#[inline]
|
|
fn to_u8(&self) -> Option<u8> { Some(*self as u8) }
|
|
#[inline]
|
|
fn to_u16(&self) -> Option<u16> { Some(*self as u16) }
|
|
#[inline]
|
|
fn to_u32(&self) -> Option<u32> { Some(*self as u32) }
|
|
#[inline]
|
|
fn to_u64(&self) -> Option<u64> { Some(*self as u64) }
|
|
|
|
#[inline]
|
|
fn to_f32(&self) -> Option<f32> { impl_to_primitive_float_to_float!($T, f32) }
|
|
#[inline]
|
|
fn to_f64(&self) -> Option<f64> { impl_to_primitive_float_to_float!($T, f64) }
|
|
}
|
|
)
|
|
)
|
|
|
|
impl_to_primitive_float!(f32)
|
|
impl_to_primitive_float!(f64)
|
|
|
|
/// A generic trait for converting a number to a value.
|
|
pub trait FromPrimitive {
|
|
/// Convert an `int` to return an optional value of this type. If the
|
|
/// value cannot be represented by this value, the `None` is returned.
|
|
#[inline]
|
|
fn from_int(n: int) -> Option<Self> {
|
|
FromPrimitive::from_i64(n as i64)
|
|
}
|
|
|
|
/// Convert an `i8` to return an optional value of this type. If the
|
|
/// type cannot be represented by this value, the `None` is returned.
|
|
#[inline]
|
|
fn from_i8(n: i8) -> Option<Self> {
|
|
FromPrimitive::from_i64(n as i64)
|
|
}
|
|
|
|
/// Convert an `i16` to return an optional value of this type. If the
|
|
/// type cannot be represented by this value, the `None` is returned.
|
|
#[inline]
|
|
fn from_i16(n: i16) -> Option<Self> {
|
|
FromPrimitive::from_i64(n as i64)
|
|
}
|
|
|
|
/// Convert an `i32` to return an optional value of this type. If the
|
|
/// type cannot be represented by this value, the `None` is returned.
|
|
#[inline]
|
|
fn from_i32(n: i32) -> Option<Self> {
|
|
FromPrimitive::from_i64(n as i64)
|
|
}
|
|
|
|
/// Convert an `i64` to return an optional value of this type. If the
|
|
/// type cannot be represented by this value, the `None` is returned.
|
|
fn from_i64(n: i64) -> Option<Self>;
|
|
|
|
/// Convert an `uint` to return an optional value of this type. If the
|
|
/// type cannot be represented by this value, the `None` is returned.
|
|
#[inline]
|
|
fn from_uint(n: uint) -> Option<Self> {
|
|
FromPrimitive::from_u64(n as u64)
|
|
}
|
|
|
|
/// Convert an `u8` to return an optional value of this type. If the
|
|
/// type cannot be represented by this value, the `None` is returned.
|
|
#[inline]
|
|
fn from_u8(n: u8) -> Option<Self> {
|
|
FromPrimitive::from_u64(n as u64)
|
|
}
|
|
|
|
/// Convert an `u16` to return an optional value of this type. If the
|
|
/// type cannot be represented by this value, the `None` is returned.
|
|
#[inline]
|
|
fn from_u16(n: u16) -> Option<Self> {
|
|
FromPrimitive::from_u64(n as u64)
|
|
}
|
|
|
|
/// Convert an `u32` to return an optional value of this type. If the
|
|
/// type cannot be represented by this value, the `None` is returned.
|
|
#[inline]
|
|
fn from_u32(n: u32) -> Option<Self> {
|
|
FromPrimitive::from_u64(n as u64)
|
|
}
|
|
|
|
/// Convert an `u64` to return an optional value of this type. If the
|
|
/// type cannot be represented by this value, the `None` is returned.
|
|
fn from_u64(n: u64) -> Option<Self>;
|
|
|
|
/// Convert a `f32` to return an optional value of this type. If the
|
|
/// type cannot be represented by this value, the `None` is returned.
|
|
#[inline]
|
|
fn from_f32(n: f32) -> Option<Self> {
|
|
FromPrimitive::from_f64(n as f64)
|
|
}
|
|
|
|
/// Convert a `f64` to return an optional value of this type. If the
|
|
/// type cannot be represented by this value, the `None` is returned.
|
|
#[inline]
|
|
fn from_f64(n: f64) -> Option<Self> {
|
|
FromPrimitive::from_i64(n as i64)
|
|
}
|
|
}
|
|
|
|
/// A utility function that just calls `FromPrimitive::from_int`.
|
|
pub fn from_int<A: FromPrimitive>(n: int) -> Option<A> {
|
|
FromPrimitive::from_int(n)
|
|
}
|
|
|
|
/// A utility function that just calls `FromPrimitive::from_i8`.
|
|
pub fn from_i8<A: FromPrimitive>(n: i8) -> Option<A> {
|
|
FromPrimitive::from_i8(n)
|
|
}
|
|
|
|
/// A utility function that just calls `FromPrimitive::from_i16`.
|
|
pub fn from_i16<A: FromPrimitive>(n: i16) -> Option<A> {
|
|
FromPrimitive::from_i16(n)
|
|
}
|
|
|
|
/// A utility function that just calls `FromPrimitive::from_i32`.
|
|
pub fn from_i32<A: FromPrimitive>(n: i32) -> Option<A> {
|
|
FromPrimitive::from_i32(n)
|
|
}
|
|
|
|
/// A utility function that just calls `FromPrimitive::from_i64`.
|
|
pub fn from_i64<A: FromPrimitive>(n: i64) -> Option<A> {
|
|
FromPrimitive::from_i64(n)
|
|
}
|
|
|
|
/// A utility function that just calls `FromPrimitive::from_uint`.
|
|
pub fn from_uint<A: FromPrimitive>(n: uint) -> Option<A> {
|
|
FromPrimitive::from_uint(n)
|
|
}
|
|
|
|
/// A utility function that just calls `FromPrimitive::from_u8`.
|
|
pub fn from_u8<A: FromPrimitive>(n: u8) -> Option<A> {
|
|
FromPrimitive::from_u8(n)
|
|
}
|
|
|
|
/// A utility function that just calls `FromPrimitive::from_u16`.
|
|
pub fn from_u16<A: FromPrimitive>(n: u16) -> Option<A> {
|
|
FromPrimitive::from_u16(n)
|
|
}
|
|
|
|
/// A utility function that just calls `FromPrimitive::from_u32`.
|
|
pub fn from_u32<A: FromPrimitive>(n: u32) -> Option<A> {
|
|
FromPrimitive::from_u32(n)
|
|
}
|
|
|
|
/// A utility function that just calls `FromPrimitive::from_u64`.
|
|
pub fn from_u64<A: FromPrimitive>(n: u64) -> Option<A> {
|
|
FromPrimitive::from_u64(n)
|
|
}
|
|
|
|
/// A utility function that just calls `FromPrimitive::from_f32`.
|
|
pub fn from_f32<A: FromPrimitive>(n: f32) -> Option<A> {
|
|
FromPrimitive::from_f32(n)
|
|
}
|
|
|
|
/// A utility function that just calls `FromPrimitive::from_f64`.
|
|
pub fn from_f64<A: FromPrimitive>(n: f64) -> Option<A> {
|
|
FromPrimitive::from_f64(n)
|
|
}
|
|
|
|
macro_rules! impl_from_primitive(
|
|
($T:ty, $to_ty:expr) => (
|
|
impl FromPrimitive for $T {
|
|
#[inline] fn from_int(n: int) -> Option<$T> { $to_ty }
|
|
#[inline] fn from_i8(n: i8) -> Option<$T> { $to_ty }
|
|
#[inline] fn from_i16(n: i16) -> Option<$T> { $to_ty }
|
|
#[inline] fn from_i32(n: i32) -> Option<$T> { $to_ty }
|
|
#[inline] fn from_i64(n: i64) -> Option<$T> { $to_ty }
|
|
|
|
#[inline] fn from_uint(n: uint) -> Option<$T> { $to_ty }
|
|
#[inline] fn from_u8(n: u8) -> Option<$T> { $to_ty }
|
|
#[inline] fn from_u16(n: u16) -> Option<$T> { $to_ty }
|
|
#[inline] fn from_u32(n: u32) -> Option<$T> { $to_ty }
|
|
#[inline] fn from_u64(n: u64) -> Option<$T> { $to_ty }
|
|
|
|
#[inline] fn from_f32(n: f32) -> Option<$T> { $to_ty }
|
|
#[inline] fn from_f64(n: f64) -> Option<$T> { $to_ty }
|
|
}
|
|
)
|
|
)
|
|
|
|
impl_from_primitive!(int, n.to_int())
|
|
impl_from_primitive!(i8, n.to_i8())
|
|
impl_from_primitive!(i16, n.to_i16())
|
|
impl_from_primitive!(i32, n.to_i32())
|
|
impl_from_primitive!(i64, n.to_i64())
|
|
impl_from_primitive!(uint, n.to_uint())
|
|
impl_from_primitive!(u8, n.to_u8())
|
|
impl_from_primitive!(u16, n.to_u16())
|
|
impl_from_primitive!(u32, n.to_u32())
|
|
impl_from_primitive!(u64, n.to_u64())
|
|
impl_from_primitive!(f32, n.to_f32())
|
|
impl_from_primitive!(f64, n.to_f64())
|
|
|
|
/// Cast from one machine scalar to another.
|
|
///
|
|
/// # Example
|
|
///
|
|
/// ```
|
|
/// let twenty: f32 = num::cast(0x14).unwrap();
|
|
/// assert_eq!(twenty, 20f32);
|
|
/// ```
|
|
///
|
|
#[inline]
|
|
pub fn cast<T: NumCast,U: NumCast>(n: T) -> Option<U> {
|
|
NumCast::from(n)
|
|
}
|
|
|
|
/// An interface for casting between machine scalars
|
|
pub trait NumCast: ToPrimitive {
|
|
fn from<T: ToPrimitive>(n: T) -> Option<Self>;
|
|
}
|
|
|
|
macro_rules! impl_num_cast(
|
|
($T:ty, $conv:ident) => (
|
|
impl NumCast for $T {
|
|
#[inline]
|
|
fn from<N: ToPrimitive>(n: N) -> Option<$T> {
|
|
// `$conv` could be generated using `concat_idents!`, but that
|
|
// macro seems to be broken at the moment
|
|
n.$conv()
|
|
}
|
|
}
|
|
)
|
|
)
|
|
|
|
impl_num_cast!(u8, to_u8)
|
|
impl_num_cast!(u16, to_u16)
|
|
impl_num_cast!(u32, to_u32)
|
|
impl_num_cast!(u64, to_u64)
|
|
impl_num_cast!(uint, to_uint)
|
|
impl_num_cast!(i8, to_i8)
|
|
impl_num_cast!(i16, to_i16)
|
|
impl_num_cast!(i32, to_i32)
|
|
impl_num_cast!(i64, to_i64)
|
|
impl_num_cast!(int, to_int)
|
|
impl_num_cast!(f32, to_f32)
|
|
impl_num_cast!(f64, to_f64)
|
|
|
|
pub trait ToStrRadix {
|
|
fn to_str_radix(&self, radix: uint) -> ~str;
|
|
}
|
|
|
|
pub trait FromStrRadix {
|
|
fn from_str_radix(str: &str, radix: uint) -> Option<Self>;
|
|
}
|
|
|
|
/// A utility function that just calls FromStrRadix::from_str_radix.
|
|
pub fn from_str_radix<T: FromStrRadix>(str: &str, radix: uint) -> Option<T> {
|
|
FromStrRadix::from_str_radix(str, radix)
|
|
}
|
|
|
|
/// Calculates a power to a given radix, optimized for uint `pow` and `radix`.
|
|
///
|
|
/// Returns `radix^pow` as `T`.
|
|
///
|
|
/// Note:
|
|
/// Also returns `1` for `0^0`, despite that technically being an
|
|
/// undefined number. The reason for this is twofold:
|
|
/// - If code written to use this function cares about that special case, it's
|
|
/// probably going to catch it before making the call.
|
|
/// - If code written to use this function doesn't care about it, it's
|
|
/// probably assuming that `x^0` always equals `1`.
|
|
///
|
|
pub fn pow_with_uint<T:NumCast+One+Zero+Div<T,T>+Mul<T,T>>(radix: uint, pow: uint) -> T {
|
|
let _0: T = Zero::zero();
|
|
let _1: T = One::one();
|
|
|
|
if pow == 0u { return _1; }
|
|
if radix == 0u { return _0; }
|
|
let mut my_pow = pow;
|
|
let mut total = _1;
|
|
let mut multiplier = cast(radix).unwrap();
|
|
while (my_pow > 0u) {
|
|
if my_pow % 2u == 1u {
|
|
total = total * multiplier;
|
|
}
|
|
my_pow = my_pow / 2u;
|
|
multiplier = multiplier * multiplier;
|
|
}
|
|
total
|
|
}
|
|
|
|
impl<T: Zero + 'static> Zero for @T {
|
|
fn zero() -> @T { @Zero::zero() }
|
|
fn is_zero(&self) -> bool { (**self).is_zero() }
|
|
}
|
|
|
|
impl<T: Zero> Zero for ~T {
|
|
fn zero() -> ~T { ~Zero::zero() }
|
|
fn is_zero(&self) -> bool { (**self).is_zero() }
|
|
}
|
|
|
|
/// Saturating math operations
|
|
pub trait Saturating {
|
|
/// Saturating addition operator.
|
|
/// Returns a+b, saturating at the numeric bounds instead of overflowing.
|
|
fn saturating_add(self, v: Self) -> Self;
|
|
|
|
/// Saturating subtraction operator.
|
|
/// Returns a-b, saturating at the numeric bounds instead of overflowing.
|
|
fn saturating_sub(self, v: Self) -> Self;
|
|
}
|
|
|
|
impl<T: CheckedAdd + CheckedSub + Zero + Ord + Bounded> Saturating for T {
|
|
#[inline]
|
|
fn saturating_add(self, v: T) -> T {
|
|
match self.checked_add(&v) {
|
|
Some(x) => x,
|
|
None => if v >= Zero::zero() {
|
|
Bounded::max_value()
|
|
} else {
|
|
Bounded::min_value()
|
|
}
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
fn saturating_sub(self, v: T) -> T {
|
|
match self.checked_sub(&v) {
|
|
Some(x) => x,
|
|
None => if v >= Zero::zero() {
|
|
Bounded::min_value()
|
|
} else {
|
|
Bounded::max_value()
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub trait CheckedAdd: Add<Self, Self> {
|
|
fn checked_add(&self, v: &Self) -> Option<Self>;
|
|
}
|
|
|
|
pub trait CheckedSub: Sub<Self, Self> {
|
|
fn checked_sub(&self, v: &Self) -> Option<Self>;
|
|
}
|
|
|
|
pub trait CheckedMul: Mul<Self, Self> {
|
|
fn checked_mul(&self, v: &Self) -> Option<Self>;
|
|
}
|
|
|
|
pub trait CheckedDiv: Div<Self, Self> {
|
|
fn checked_div(&self, v: &Self) -> Option<Self>;
|
|
}
|
|
|
|
/// Helper function for testing numeric operations
|
|
#[cfg(test)]
|
|
pub fn test_num<T:Num + NumCast>(ten: T, two: T) {
|
|
assert_eq!(ten.add(&two), cast(12).unwrap());
|
|
assert_eq!(ten.sub(&two), cast(8).unwrap());
|
|
assert_eq!(ten.mul(&two), cast(20).unwrap());
|
|
assert_eq!(ten.div(&two), cast(5).unwrap());
|
|
assert_eq!(ten.rem(&two), cast(0).unwrap());
|
|
|
|
assert_eq!(ten.add(&two), ten + two);
|
|
assert_eq!(ten.sub(&two), ten - two);
|
|
assert_eq!(ten.mul(&two), ten * two);
|
|
assert_eq!(ten.div(&two), ten / two);
|
|
assert_eq!(ten.rem(&two), ten % two);
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use prelude::*;
|
|
use super::*;
|
|
use i8;
|
|
use i16;
|
|
use i32;
|
|
use i64;
|
|
use int;
|
|
use u8;
|
|
use u16;
|
|
use u32;
|
|
use u64;
|
|
use uint;
|
|
|
|
macro_rules! test_cast_20(
|
|
($_20:expr) => ({
|
|
let _20 = $_20;
|
|
|
|
assert_eq!(20u, _20.to_uint().unwrap());
|
|
assert_eq!(20u8, _20.to_u8().unwrap());
|
|
assert_eq!(20u16, _20.to_u16().unwrap());
|
|
assert_eq!(20u32, _20.to_u32().unwrap());
|
|
assert_eq!(20u64, _20.to_u64().unwrap());
|
|
assert_eq!(20i, _20.to_int().unwrap());
|
|
assert_eq!(20i8, _20.to_i8().unwrap());
|
|
assert_eq!(20i16, _20.to_i16().unwrap());
|
|
assert_eq!(20i32, _20.to_i32().unwrap());
|
|
assert_eq!(20i64, _20.to_i64().unwrap());
|
|
assert_eq!(20f32, _20.to_f32().unwrap());
|
|
assert_eq!(20f64, _20.to_f64().unwrap());
|
|
|
|
assert_eq!(_20, NumCast::from(20u).unwrap());
|
|
assert_eq!(_20, NumCast::from(20u8).unwrap());
|
|
assert_eq!(_20, NumCast::from(20u16).unwrap());
|
|
assert_eq!(_20, NumCast::from(20u32).unwrap());
|
|
assert_eq!(_20, NumCast::from(20u64).unwrap());
|
|
assert_eq!(_20, NumCast::from(20i).unwrap());
|
|
assert_eq!(_20, NumCast::from(20i8).unwrap());
|
|
assert_eq!(_20, NumCast::from(20i16).unwrap());
|
|
assert_eq!(_20, NumCast::from(20i32).unwrap());
|
|
assert_eq!(_20, NumCast::from(20i64).unwrap());
|
|
assert_eq!(_20, NumCast::from(20f32).unwrap());
|
|
assert_eq!(_20, NumCast::from(20f64).unwrap());
|
|
|
|
assert_eq!(_20, cast(20u).unwrap());
|
|
assert_eq!(_20, cast(20u8).unwrap());
|
|
assert_eq!(_20, cast(20u16).unwrap());
|
|
assert_eq!(_20, cast(20u32).unwrap());
|
|
assert_eq!(_20, cast(20u64).unwrap());
|
|
assert_eq!(_20, cast(20i).unwrap());
|
|
assert_eq!(_20, cast(20i8).unwrap());
|
|
assert_eq!(_20, cast(20i16).unwrap());
|
|
assert_eq!(_20, cast(20i32).unwrap());
|
|
assert_eq!(_20, cast(20i64).unwrap());
|
|
assert_eq!(_20, cast(20f32).unwrap());
|
|
assert_eq!(_20, cast(20f64).unwrap());
|
|
})
|
|
)
|
|
|
|
#[test] fn test_u8_cast() { test_cast_20!(20u8) }
|
|
#[test] fn test_u16_cast() { test_cast_20!(20u16) }
|
|
#[test] fn test_u32_cast() { test_cast_20!(20u32) }
|
|
#[test] fn test_u64_cast() { test_cast_20!(20u64) }
|
|
#[test] fn test_uint_cast() { test_cast_20!(20u) }
|
|
#[test] fn test_i8_cast() { test_cast_20!(20i8) }
|
|
#[test] fn test_i16_cast() { test_cast_20!(20i16) }
|
|
#[test] fn test_i32_cast() { test_cast_20!(20i32) }
|
|
#[test] fn test_i64_cast() { test_cast_20!(20i64) }
|
|
#[test] fn test_int_cast() { test_cast_20!(20i) }
|
|
#[test] fn test_f32_cast() { test_cast_20!(20f32) }
|
|
#[test] fn test_f64_cast() { test_cast_20!(20f64) }
|
|
|
|
#[test]
|
|
fn test_cast_range_int_min() {
|
|
assert_eq!(int::min_value.to_int(), Some(int::min_value as int));
|
|
assert_eq!(int::min_value.to_i8(), None);
|
|
assert_eq!(int::min_value.to_i16(), None);
|
|
// int::min_value.to_i32() is word-size specific
|
|
assert_eq!(int::min_value.to_i64(), Some(int::min_value as i64));
|
|
assert_eq!(int::min_value.to_uint(), None);
|
|
assert_eq!(int::min_value.to_u8(), None);
|
|
assert_eq!(int::min_value.to_u16(), None);
|
|
assert_eq!(int::min_value.to_u32(), None);
|
|
assert_eq!(int::min_value.to_u64(), None);
|
|
|
|
#[cfg(target_word_size = "32")]
|
|
fn check_word_size() {
|
|
assert_eq!(int::min_value.to_i32(), Some(int::min_value as i32));
|
|
}
|
|
|
|
#[cfg(target_word_size = "64")]
|
|
fn check_word_size() {
|
|
assert_eq!(int::min_value.to_i32(), None);
|
|
}
|
|
|
|
check_word_size();
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_i8_min() {
|
|
assert_eq!(i8::min_value.to_int(), Some(i8::min_value as int));
|
|
assert_eq!(i8::min_value.to_i8(), Some(i8::min_value as i8));
|
|
assert_eq!(i8::min_value.to_i16(), Some(i8::min_value as i16));
|
|
assert_eq!(i8::min_value.to_i32(), Some(i8::min_value as i32));
|
|
assert_eq!(i8::min_value.to_i64(), Some(i8::min_value as i64));
|
|
assert_eq!(i8::min_value.to_uint(), None);
|
|
assert_eq!(i8::min_value.to_u8(), None);
|
|
assert_eq!(i8::min_value.to_u16(), None);
|
|
assert_eq!(i8::min_value.to_u32(), None);
|
|
assert_eq!(i8::min_value.to_u64(), None);
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_i16_min() {
|
|
assert_eq!(i16::min_value.to_int(), Some(i16::min_value as int));
|
|
assert_eq!(i16::min_value.to_i8(), None);
|
|
assert_eq!(i16::min_value.to_i16(), Some(i16::min_value as i16));
|
|
assert_eq!(i16::min_value.to_i32(), Some(i16::min_value as i32));
|
|
assert_eq!(i16::min_value.to_i64(), Some(i16::min_value as i64));
|
|
assert_eq!(i16::min_value.to_uint(), None);
|
|
assert_eq!(i16::min_value.to_u8(), None);
|
|
assert_eq!(i16::min_value.to_u16(), None);
|
|
assert_eq!(i16::min_value.to_u32(), None);
|
|
assert_eq!(i16::min_value.to_u64(), None);
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_i32_min() {
|
|
assert_eq!(i32::min_value.to_int(), Some(i32::min_value as int));
|
|
assert_eq!(i32::min_value.to_i8(), None);
|
|
assert_eq!(i32::min_value.to_i16(), None);
|
|
assert_eq!(i32::min_value.to_i32(), Some(i32::min_value as i32));
|
|
assert_eq!(i32::min_value.to_i64(), Some(i32::min_value as i64));
|
|
assert_eq!(i32::min_value.to_uint(), None);
|
|
assert_eq!(i32::min_value.to_u8(), None);
|
|
assert_eq!(i32::min_value.to_u16(), None);
|
|
assert_eq!(i32::min_value.to_u32(), None);
|
|
assert_eq!(i32::min_value.to_u64(), None);
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_i64_min() {
|
|
// i64::min_value.to_int() is word-size specific
|
|
assert_eq!(i64::min_value.to_i8(), None);
|
|
assert_eq!(i64::min_value.to_i16(), None);
|
|
assert_eq!(i64::min_value.to_i32(), None);
|
|
assert_eq!(i64::min_value.to_i64(), Some(i64::min_value as i64));
|
|
assert_eq!(i64::min_value.to_uint(), None);
|
|
assert_eq!(i64::min_value.to_u8(), None);
|
|
assert_eq!(i64::min_value.to_u16(), None);
|
|
assert_eq!(i64::min_value.to_u32(), None);
|
|
assert_eq!(i64::min_value.to_u64(), None);
|
|
|
|
#[cfg(target_word_size = "32")]
|
|
fn check_word_size() {
|
|
assert_eq!(i64::min_value.to_int(), None);
|
|
}
|
|
|
|
#[cfg(target_word_size = "64")]
|
|
fn check_word_size() {
|
|
assert_eq!(i64::min_value.to_int(), Some(i64::min_value as int));
|
|
}
|
|
|
|
check_word_size();
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_int_max() {
|
|
assert_eq!(int::max_value.to_int(), Some(int::max_value as int));
|
|
assert_eq!(int::max_value.to_i8(), None);
|
|
assert_eq!(int::max_value.to_i16(), None);
|
|
// int::max_value.to_i32() is word-size specific
|
|
assert_eq!(int::max_value.to_i64(), Some(int::max_value as i64));
|
|
assert_eq!(int::max_value.to_u8(), None);
|
|
assert_eq!(int::max_value.to_u16(), None);
|
|
// int::max_value.to_u32() is word-size specific
|
|
assert_eq!(int::max_value.to_u64(), Some(int::max_value as u64));
|
|
|
|
#[cfg(target_word_size = "32")]
|
|
fn check_word_size() {
|
|
assert_eq!(int::max_value.to_i32(), Some(int::max_value as i32));
|
|
assert_eq!(int::max_value.to_u32(), Some(int::max_value as u32));
|
|
}
|
|
|
|
#[cfg(target_word_size = "64")]
|
|
fn check_word_size() {
|
|
assert_eq!(int::max_value.to_i32(), None);
|
|
assert_eq!(int::max_value.to_u32(), None);
|
|
}
|
|
|
|
check_word_size();
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_i8_max() {
|
|
assert_eq!(i8::max_value.to_int(), Some(i8::max_value as int));
|
|
assert_eq!(i8::max_value.to_i8(), Some(i8::max_value as i8));
|
|
assert_eq!(i8::max_value.to_i16(), Some(i8::max_value as i16));
|
|
assert_eq!(i8::max_value.to_i32(), Some(i8::max_value as i32));
|
|
assert_eq!(i8::max_value.to_i64(), Some(i8::max_value as i64));
|
|
assert_eq!(i8::max_value.to_uint(), Some(i8::max_value as uint));
|
|
assert_eq!(i8::max_value.to_u8(), Some(i8::max_value as u8));
|
|
assert_eq!(i8::max_value.to_u16(), Some(i8::max_value as u16));
|
|
assert_eq!(i8::max_value.to_u32(), Some(i8::max_value as u32));
|
|
assert_eq!(i8::max_value.to_u64(), Some(i8::max_value as u64));
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_i16_max() {
|
|
assert_eq!(i16::max_value.to_int(), Some(i16::max_value as int));
|
|
assert_eq!(i16::max_value.to_i8(), None);
|
|
assert_eq!(i16::max_value.to_i16(), Some(i16::max_value as i16));
|
|
assert_eq!(i16::max_value.to_i32(), Some(i16::max_value as i32));
|
|
assert_eq!(i16::max_value.to_i64(), Some(i16::max_value as i64));
|
|
assert_eq!(i16::max_value.to_uint(), Some(i16::max_value as uint));
|
|
assert_eq!(i16::max_value.to_u8(), None);
|
|
assert_eq!(i16::max_value.to_u16(), Some(i16::max_value as u16));
|
|
assert_eq!(i16::max_value.to_u32(), Some(i16::max_value as u32));
|
|
assert_eq!(i16::max_value.to_u64(), Some(i16::max_value as u64));
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_i32_max() {
|
|
assert_eq!(i32::max_value.to_int(), Some(i32::max_value as int));
|
|
assert_eq!(i32::max_value.to_i8(), None);
|
|
assert_eq!(i32::max_value.to_i16(), None);
|
|
assert_eq!(i32::max_value.to_i32(), Some(i32::max_value as i32));
|
|
assert_eq!(i32::max_value.to_i64(), Some(i32::max_value as i64));
|
|
assert_eq!(i32::max_value.to_uint(), Some(i32::max_value as uint));
|
|
assert_eq!(i32::max_value.to_u8(), None);
|
|
assert_eq!(i32::max_value.to_u16(), None);
|
|
assert_eq!(i32::max_value.to_u32(), Some(i32::max_value as u32));
|
|
assert_eq!(i32::max_value.to_u64(), Some(i32::max_value as u64));
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_i64_max() {
|
|
// i64::max_value.to_int() is word-size specific
|
|
assert_eq!(i64::max_value.to_i8(), None);
|
|
assert_eq!(i64::max_value.to_i16(), None);
|
|
assert_eq!(i64::max_value.to_i32(), None);
|
|
assert_eq!(i64::max_value.to_i64(), Some(i64::max_value as i64));
|
|
// i64::max_value.to_uint() is word-size specific
|
|
assert_eq!(i64::max_value.to_u8(), None);
|
|
assert_eq!(i64::max_value.to_u16(), None);
|
|
assert_eq!(i64::max_value.to_u32(), None);
|
|
assert_eq!(i64::max_value.to_u64(), Some(i64::max_value as u64));
|
|
|
|
#[cfg(target_word_size = "32")]
|
|
fn check_word_size() {
|
|
assert_eq!(i64::max_value.to_int(), None);
|
|
assert_eq!(i64::max_value.to_uint(), None);
|
|
}
|
|
|
|
#[cfg(target_word_size = "64")]
|
|
fn check_word_size() {
|
|
assert_eq!(i64::max_value.to_int(), Some(i64::max_value as int));
|
|
assert_eq!(i64::max_value.to_uint(), Some(i64::max_value as uint));
|
|
}
|
|
|
|
check_word_size();
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_uint_min() {
|
|
assert_eq!(uint::min_value.to_int(), Some(uint::min_value as int));
|
|
assert_eq!(uint::min_value.to_i8(), Some(uint::min_value as i8));
|
|
assert_eq!(uint::min_value.to_i16(), Some(uint::min_value as i16));
|
|
assert_eq!(uint::min_value.to_i32(), Some(uint::min_value as i32));
|
|
assert_eq!(uint::min_value.to_i64(), Some(uint::min_value as i64));
|
|
assert_eq!(uint::min_value.to_uint(), Some(uint::min_value as uint));
|
|
assert_eq!(uint::min_value.to_u8(), Some(uint::min_value as u8));
|
|
assert_eq!(uint::min_value.to_u16(), Some(uint::min_value as u16));
|
|
assert_eq!(uint::min_value.to_u32(), Some(uint::min_value as u32));
|
|
assert_eq!(uint::min_value.to_u64(), Some(uint::min_value as u64));
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_u8_min() {
|
|
assert_eq!(u8::min_value.to_int(), Some(u8::min_value as int));
|
|
assert_eq!(u8::min_value.to_i8(), Some(u8::min_value as i8));
|
|
assert_eq!(u8::min_value.to_i16(), Some(u8::min_value as i16));
|
|
assert_eq!(u8::min_value.to_i32(), Some(u8::min_value as i32));
|
|
assert_eq!(u8::min_value.to_i64(), Some(u8::min_value as i64));
|
|
assert_eq!(u8::min_value.to_uint(), Some(u8::min_value as uint));
|
|
assert_eq!(u8::min_value.to_u8(), Some(u8::min_value as u8));
|
|
assert_eq!(u8::min_value.to_u16(), Some(u8::min_value as u16));
|
|
assert_eq!(u8::min_value.to_u32(), Some(u8::min_value as u32));
|
|
assert_eq!(u8::min_value.to_u64(), Some(u8::min_value as u64));
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_u16_min() {
|
|
assert_eq!(u16::min_value.to_int(), Some(u16::min_value as int));
|
|
assert_eq!(u16::min_value.to_i8(), Some(u16::min_value as i8));
|
|
assert_eq!(u16::min_value.to_i16(), Some(u16::min_value as i16));
|
|
assert_eq!(u16::min_value.to_i32(), Some(u16::min_value as i32));
|
|
assert_eq!(u16::min_value.to_i64(), Some(u16::min_value as i64));
|
|
assert_eq!(u16::min_value.to_uint(), Some(u16::min_value as uint));
|
|
assert_eq!(u16::min_value.to_u8(), Some(u16::min_value as u8));
|
|
assert_eq!(u16::min_value.to_u16(), Some(u16::min_value as u16));
|
|
assert_eq!(u16::min_value.to_u32(), Some(u16::min_value as u32));
|
|
assert_eq!(u16::min_value.to_u64(), Some(u16::min_value as u64));
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_u32_min() {
|
|
assert_eq!(u32::min_value.to_int(), Some(u32::min_value as int));
|
|
assert_eq!(u32::min_value.to_i8(), Some(u32::min_value as i8));
|
|
assert_eq!(u32::min_value.to_i16(), Some(u32::min_value as i16));
|
|
assert_eq!(u32::min_value.to_i32(), Some(u32::min_value as i32));
|
|
assert_eq!(u32::min_value.to_i64(), Some(u32::min_value as i64));
|
|
assert_eq!(u32::min_value.to_uint(), Some(u32::min_value as uint));
|
|
assert_eq!(u32::min_value.to_u8(), Some(u32::min_value as u8));
|
|
assert_eq!(u32::min_value.to_u16(), Some(u32::min_value as u16));
|
|
assert_eq!(u32::min_value.to_u32(), Some(u32::min_value as u32));
|
|
assert_eq!(u32::min_value.to_u64(), Some(u32::min_value as u64));
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_u64_min() {
|
|
assert_eq!(u64::min_value.to_int(), Some(u64::min_value as int));
|
|
assert_eq!(u64::min_value.to_i8(), Some(u64::min_value as i8));
|
|
assert_eq!(u64::min_value.to_i16(), Some(u64::min_value as i16));
|
|
assert_eq!(u64::min_value.to_i32(), Some(u64::min_value as i32));
|
|
assert_eq!(u64::min_value.to_i64(), Some(u64::min_value as i64));
|
|
assert_eq!(u64::min_value.to_uint(), Some(u64::min_value as uint));
|
|
assert_eq!(u64::min_value.to_u8(), Some(u64::min_value as u8));
|
|
assert_eq!(u64::min_value.to_u16(), Some(u64::min_value as u16));
|
|
assert_eq!(u64::min_value.to_u32(), Some(u64::min_value as u32));
|
|
assert_eq!(u64::min_value.to_u64(), Some(u64::min_value as u64));
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_uint_max() {
|
|
assert_eq!(uint::max_value.to_int(), None);
|
|
assert_eq!(uint::max_value.to_i8(), None);
|
|
assert_eq!(uint::max_value.to_i16(), None);
|
|
assert_eq!(uint::max_value.to_i32(), None);
|
|
// uint::max_value.to_i64() is word-size specific
|
|
assert_eq!(uint::max_value.to_u8(), None);
|
|
assert_eq!(uint::max_value.to_u16(), None);
|
|
// uint::max_value.to_u32() is word-size specific
|
|
assert_eq!(uint::max_value.to_u64(), Some(uint::max_value as u64));
|
|
|
|
#[cfg(target_word_size = "32")]
|
|
fn check_word_size() {
|
|
assert_eq!(uint::max_value.to_u32(), Some(uint::max_value as u32));
|
|
assert_eq!(uint::max_value.to_i64(), Some(uint::max_value as i64));
|
|
}
|
|
|
|
#[cfg(target_word_size = "64")]
|
|
fn check_word_size() {
|
|
assert_eq!(uint::max_value.to_u32(), None);
|
|
assert_eq!(uint::max_value.to_i64(), None);
|
|
}
|
|
|
|
check_word_size();
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_u8_max() {
|
|
assert_eq!(u8::max_value.to_int(), Some(u8::max_value as int));
|
|
assert_eq!(u8::max_value.to_i8(), None);
|
|
assert_eq!(u8::max_value.to_i16(), Some(u8::max_value as i16));
|
|
assert_eq!(u8::max_value.to_i32(), Some(u8::max_value as i32));
|
|
assert_eq!(u8::max_value.to_i64(), Some(u8::max_value as i64));
|
|
assert_eq!(u8::max_value.to_uint(), Some(u8::max_value as uint));
|
|
assert_eq!(u8::max_value.to_u8(), Some(u8::max_value as u8));
|
|
assert_eq!(u8::max_value.to_u16(), Some(u8::max_value as u16));
|
|
assert_eq!(u8::max_value.to_u32(), Some(u8::max_value as u32));
|
|
assert_eq!(u8::max_value.to_u64(), Some(u8::max_value as u64));
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_u16_max() {
|
|
assert_eq!(u16::max_value.to_int(), Some(u16::max_value as int));
|
|
assert_eq!(u16::max_value.to_i8(), None);
|
|
assert_eq!(u16::max_value.to_i16(), None);
|
|
assert_eq!(u16::max_value.to_i32(), Some(u16::max_value as i32));
|
|
assert_eq!(u16::max_value.to_i64(), Some(u16::max_value as i64));
|
|
assert_eq!(u16::max_value.to_uint(), Some(u16::max_value as uint));
|
|
assert_eq!(u16::max_value.to_u8(), None);
|
|
assert_eq!(u16::max_value.to_u16(), Some(u16::max_value as u16));
|
|
assert_eq!(u16::max_value.to_u32(), Some(u16::max_value as u32));
|
|
assert_eq!(u16::max_value.to_u64(), Some(u16::max_value as u64));
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_u32_max() {
|
|
// u32::max_value.to_int() is word-size specific
|
|
assert_eq!(u32::max_value.to_i8(), None);
|
|
assert_eq!(u32::max_value.to_i16(), None);
|
|
assert_eq!(u32::max_value.to_i32(), None);
|
|
assert_eq!(u32::max_value.to_i64(), Some(u32::max_value as i64));
|
|
assert_eq!(u32::max_value.to_uint(), Some(u32::max_value as uint));
|
|
assert_eq!(u32::max_value.to_u8(), None);
|
|
assert_eq!(u32::max_value.to_u16(), None);
|
|
assert_eq!(u32::max_value.to_u32(), Some(u32::max_value as u32));
|
|
assert_eq!(u32::max_value.to_u64(), Some(u32::max_value as u64));
|
|
|
|
#[cfg(target_word_size = "32")]
|
|
fn check_word_size() {
|
|
assert_eq!(u32::max_value.to_int(), None);
|
|
}
|
|
|
|
#[cfg(target_word_size = "64")]
|
|
fn check_word_size() {
|
|
assert_eq!(u32::max_value.to_int(), Some(u32::max_value as int));
|
|
}
|
|
|
|
check_word_size();
|
|
}
|
|
|
|
#[test]
|
|
fn test_cast_range_u64_max() {
|
|
assert_eq!(u64::max_value.to_int(), None);
|
|
assert_eq!(u64::max_value.to_i8(), None);
|
|
assert_eq!(u64::max_value.to_i16(), None);
|
|
assert_eq!(u64::max_value.to_i32(), None);
|
|
assert_eq!(u64::max_value.to_i64(), None);
|
|
// u64::max_value.to_uint() is word-size specific
|
|
assert_eq!(u64::max_value.to_u8(), None);
|
|
assert_eq!(u64::max_value.to_u16(), None);
|
|
assert_eq!(u64::max_value.to_u32(), None);
|
|
assert_eq!(u64::max_value.to_u64(), Some(u64::max_value as u64));
|
|
|
|
#[cfg(target_word_size = "32")]
|
|
fn check_word_size() {
|
|
assert_eq!(u64::max_value.to_uint(), None);
|
|
}
|
|
|
|
#[cfg(target_word_size = "64")]
|
|
fn check_word_size() {
|
|
assert_eq!(u64::max_value.to_uint(), Some(u64::max_value as uint));
|
|
}
|
|
|
|
check_word_size();
|
|
}
|
|
|
|
#[test]
|
|
fn test_saturating_add_uint() {
|
|
use uint::max_value;
|
|
assert_eq!(3u.saturating_add(5u), 8u);
|
|
assert_eq!(3u.saturating_add(max_value-1), max_value);
|
|
assert_eq!(max_value.saturating_add(max_value), max_value);
|
|
assert_eq!((max_value-2).saturating_add(1), max_value-1);
|
|
}
|
|
|
|
#[test]
|
|
fn test_saturating_sub_uint() {
|
|
use uint::max_value;
|
|
assert_eq!(5u.saturating_sub(3u), 2u);
|
|
assert_eq!(3u.saturating_sub(5u), 0u);
|
|
assert_eq!(0u.saturating_sub(1u), 0u);
|
|
assert_eq!((max_value-1).saturating_sub(max_value), 0);
|
|
}
|
|
|
|
#[test]
|
|
fn test_saturating_add_int() {
|
|
use int::{min_value,max_value};
|
|
assert_eq!(3i.saturating_add(5i), 8i);
|
|
assert_eq!(3i.saturating_add(max_value-1), max_value);
|
|
assert_eq!(max_value.saturating_add(max_value), max_value);
|
|
assert_eq!((max_value-2).saturating_add(1), max_value-1);
|
|
assert_eq!(3i.saturating_add(-5i), -2i);
|
|
assert_eq!(min_value.saturating_add(-1i), min_value);
|
|
assert_eq!((-2i).saturating_add(-max_value), min_value);
|
|
}
|
|
|
|
#[test]
|
|
fn test_saturating_sub_int() {
|
|
use int::{min_value,max_value};
|
|
assert_eq!(3i.saturating_sub(5i), -2i);
|
|
assert_eq!(min_value.saturating_sub(1i), min_value);
|
|
assert_eq!((-2i).saturating_sub(max_value), min_value);
|
|
assert_eq!(3i.saturating_sub(-5i), 8i);
|
|
assert_eq!(3i.saturating_sub(-(max_value-1)), max_value);
|
|
assert_eq!(max_value.saturating_sub(-max_value), max_value);
|
|
assert_eq!((max_value-2).saturating_sub(-1), max_value-1);
|
|
}
|
|
|
|
#[test]
|
|
fn test_checked_add() {
|
|
let five_less = uint::max_value - 5;
|
|
assert_eq!(five_less.checked_add(&0), Some(uint::max_value - 5));
|
|
assert_eq!(five_less.checked_add(&1), Some(uint::max_value - 4));
|
|
assert_eq!(five_less.checked_add(&2), Some(uint::max_value - 3));
|
|
assert_eq!(five_less.checked_add(&3), Some(uint::max_value - 2));
|
|
assert_eq!(five_less.checked_add(&4), Some(uint::max_value - 1));
|
|
assert_eq!(five_less.checked_add(&5), Some(uint::max_value));
|
|
assert_eq!(five_less.checked_add(&6), None);
|
|
assert_eq!(five_less.checked_add(&7), None);
|
|
}
|
|
|
|
#[test]
|
|
fn test_checked_sub() {
|
|
assert_eq!(5u.checked_sub(&0), Some(5));
|
|
assert_eq!(5u.checked_sub(&1), Some(4));
|
|
assert_eq!(5u.checked_sub(&2), Some(3));
|
|
assert_eq!(5u.checked_sub(&3), Some(2));
|
|
assert_eq!(5u.checked_sub(&4), Some(1));
|
|
assert_eq!(5u.checked_sub(&5), Some(0));
|
|
assert_eq!(5u.checked_sub(&6), None);
|
|
assert_eq!(5u.checked_sub(&7), None);
|
|
}
|
|
|
|
#[test]
|
|
fn test_checked_mul() {
|
|
let third = uint::max_value / 3;
|
|
assert_eq!(third.checked_mul(&0), Some(0));
|
|
assert_eq!(third.checked_mul(&1), Some(third));
|
|
assert_eq!(third.checked_mul(&2), Some(third * 2));
|
|
assert_eq!(third.checked_mul(&3), Some(third * 3));
|
|
assert_eq!(third.checked_mul(&4), None);
|
|
}
|
|
|
|
|
|
#[deriving(Eq)]
|
|
struct Value { x: int }
|
|
|
|
impl ToPrimitive for Value {
|
|
fn to_i64(&self) -> Option<i64> { self.x.to_i64() }
|
|
fn to_u64(&self) -> Option<u64> { self.x.to_u64() }
|
|
}
|
|
|
|
impl FromPrimitive for Value {
|
|
fn from_i64(n: i64) -> Option<Value> { Some(Value { x: n as int }) }
|
|
fn from_u64(n: u64) -> Option<Value> { Some(Value { x: n as int }) }
|
|
}
|
|
|
|
#[test]
|
|
fn test_to_primitive() {
|
|
let value = Value { x: 5 };
|
|
assert_eq!(value.to_int(), Some(5));
|
|
assert_eq!(value.to_i8(), Some(5));
|
|
assert_eq!(value.to_i16(), Some(5));
|
|
assert_eq!(value.to_i32(), Some(5));
|
|
assert_eq!(value.to_i64(), Some(5));
|
|
assert_eq!(value.to_uint(), Some(5));
|
|
assert_eq!(value.to_u8(), Some(5));
|
|
assert_eq!(value.to_u16(), Some(5));
|
|
assert_eq!(value.to_u32(), Some(5));
|
|
assert_eq!(value.to_u64(), Some(5));
|
|
assert_eq!(value.to_f32(), Some(5f32));
|
|
assert_eq!(value.to_f64(), Some(5f64));
|
|
}
|
|
|
|
#[test]
|
|
fn test_from_primitive() {
|
|
assert_eq!(from_int(5), Some(Value { x: 5 }));
|
|
assert_eq!(from_i8(5), Some(Value { x: 5 }));
|
|
assert_eq!(from_i16(5), Some(Value { x: 5 }));
|
|
assert_eq!(from_i32(5), Some(Value { x: 5 }));
|
|
assert_eq!(from_i64(5), Some(Value { x: 5 }));
|
|
assert_eq!(from_uint(5), Some(Value { x: 5 }));
|
|
assert_eq!(from_u8(5), Some(Value { x: 5 }));
|
|
assert_eq!(from_u16(5), Some(Value { x: 5 }));
|
|
assert_eq!(from_u32(5), Some(Value { x: 5 }));
|
|
assert_eq!(from_u64(5), Some(Value { x: 5 }));
|
|
assert_eq!(from_f32(5f32), Some(Value { x: 5 }));
|
|
assert_eq!(from_f64(5f64), Some(Value { x: 5 }));
|
|
}
|
|
}
|