70 lines
1.7 KiB
Rust
70 lines
1.7 KiB
Rust
#![feature(plugin)]
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#![plugin(clippy)]
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#![warn(float_cmp)]
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#![allow(unused, no_effect, unnecessary_operation, cast_lossless)]
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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 where T : Add<T, Output = T>, T : Copy {
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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() { y.is_nan() } else { x == y } // 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() { y.is_nan() } else { x == y } // no error, inside "eq" fn
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}
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struct X { val: f32 }
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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 != ::std::f32::INFINITY; // also comparison with infinity
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1.0f32 != ::std::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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}
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