125 lines
2.8 KiB
Rust
125 lines
2.8 KiB
Rust
#![warn(clippy::float_cmp)]
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#![allow(
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unused,
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clippy::no_effect,
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clippy::op_ref,
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clippy::unnecessary_operation,
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clippy::cast_lossless,
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clippy::many_single_char_names
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)]
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use std::ops::Add;
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const ZERO: f32 = 0.0;
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const ONE: f32 = ZERO + 1.0;
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fn twice<T>(x: T) -> T
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where
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T: Add<T, Output = T> + Copy,
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{
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x + x
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}
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fn eq_fl(x: f32, y: f32) -> bool {
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if x.is_nan() {
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y.is_nan()
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} else {
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x == y
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} // no error, inside "eq" fn
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}
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fn fl_eq(x: f32, y: f32) -> bool {
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if x.is_nan() {
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y.is_nan()
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} else {
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x == y
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} // no error, inside "eq" fn
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}
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struct X {
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val: f32,
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}
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impl PartialEq for X {
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fn eq(&self, o: &X) -> bool {
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if self.val.is_nan() {
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o.val.is_nan()
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} else {
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self.val == o.val // no error, inside "eq" fn
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}
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}
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}
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fn main() {
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ZERO == 0f32; //no error, comparison with zero is ok
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1.0f32 != f32::INFINITY; // also comparison with infinity
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1.0f32 != f32::NEG_INFINITY; // and negative infinity
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ZERO == 0.0; //no error, comparison with zero is ok
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ZERO + ZERO != 1.0; //no error, comparison with zero is ok
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ONE == 1f32;
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ONE == 1.0 + 0.0;
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ONE + ONE == ZERO + ONE + ONE;
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ONE != 2.0;
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ONE != 0.0; // no error, comparison with zero is ok
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twice(ONE) != ONE;
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ONE as f64 != 2.0;
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ONE as f64 != 0.0; // no error, comparison with zero is ok
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let x: f64 = 1.0;
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x == 1.0;
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x != 0f64; // no error, comparison with zero is ok
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twice(x) != twice(ONE as f64);
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x < 0.0; // no errors, lower or greater comparisons need no fuzzyness
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x > 0.0;
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x <= 0.0;
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x >= 0.0;
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let xs: [f32; 1] = [0.0];
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let a: *const f32 = xs.as_ptr();
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let b: *const f32 = xs.as_ptr();
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assert_eq!(a, b); // no errors
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const ZERO_ARRAY: [f32; 2] = [0.0, 0.0];
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const NON_ZERO_ARRAY: [f32; 2] = [0.0, 0.1];
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let i = 0;
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let j = 1;
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ZERO_ARRAY[i] == NON_ZERO_ARRAY[j]; // ok, because lhs is zero regardless of i
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NON_ZERO_ARRAY[i] == NON_ZERO_ARRAY[j];
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let a1: [f32; 1] = [0.0];
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let a2: [f32; 1] = [1.1];
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a1 == a2;
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a1[0] == a2[0];
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// no errors - comparing signums is ok
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let x32 = 3.21f32;
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1.23f32.signum() == x32.signum();
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1.23f32.signum() == -(x32.signum());
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1.23f32.signum() == 3.21f32.signum();
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1.23f32.signum() != x32.signum();
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1.23f32.signum() != -(x32.signum());
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1.23f32.signum() != 3.21f32.signum();
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let x64 = 3.21f64;
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1.23f64.signum() == x64.signum();
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1.23f64.signum() == -(x64.signum());
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1.23f64.signum() == 3.21f64.signum();
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1.23f64.signum() != x64.signum();
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1.23f64.signum() != -(x64.signum());
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1.23f64.signum() != 3.21f64.signum();
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// the comparison should also look through references
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&0.0 == &ZERO;
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&&&&0.0 == &&&&ZERO;
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}
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