rust/tests/ui/float_cmp.rs
2017-02-18 10:13:56 +09:00

97 lines
1.7 KiB
Rust

#![feature(plugin)]
#![plugin(clippy)]
#![deny(float_cmp)]
#![allow(unused, no_effect, unnecessary_operation)]
use std::ops::Add;
const ZERO : f32 = 0.0;
const ONE : f32 = ZERO + 1.0;
fn twice<T>(x : T) -> T where T : Add<T, Output = T>, T : Copy {
x + x
}
fn eq_fl(x: f32, y: f32) -> bool {
if x.is_nan() { y.is_nan() } else { x == y } // no error, inside "eq" fn
}
fn fl_eq(x: f32, y: f32) -> bool {
if x.is_nan() { y.is_nan() } else { x == y } // no error, inside "eq" fn
}
struct X { val: f32 }
impl PartialEq for X {
fn eq(&self, o: &X) -> bool {
if self.val.is_nan() {
o.val.is_nan()
} else {
self.val == o.val // no error, inside "eq" fn
}
}
}
fn main() {
ZERO == 0f32; //no error, comparison with zero is ok
1.0f32 != ::std::f32::INFINITY; // also comparison with infinity
1.0f32 != ::std::f32::NEG_INFINITY; // and negative infinity
ZERO == 0.0; //no error, comparison with zero is ok
ZERO + ZERO != 1.0; //no error, comparison with zero is ok
ONE == 1f32;
ONE == 1.0 + 0.0;
ONE + ONE == ZERO + ONE + ONE;
ONE != 2.0;
ONE != 0.0; // no error, comparison with zero is ok
twice(ONE) != ONE;
ONE as f64 != 2.0;
ONE as f64 != 0.0; // no error, comparison with zero is ok
let x : f64 = 1.0;
x == 1.0;
x != 0f64; // no error, comparison with zero is ok
twice(x) != twice(ONE as f64);
x < 0.0; // no errors, lower or greater comparisons need no fuzzyness
x > 0.0;
x <= 0.0;
x >= 0.0;
let xs : [f32; 1] = [0.0];
let a: *const f32 = xs.as_ptr();
let b: *const f32 = xs.as_ptr();
assert_eq!(a, b); // no errors
}