rust/tests/ui/float_cmp.rs

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#![warn(clippy::float_cmp)]
#![allow(unused, clippy::no_effect, clippy::unnecessary_operation, clippy::cast_lossless)]
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use std::ops::Add;
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const ZERO: f32 = 0.0;
const ONE: f32 = ZERO + 1.0;
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fn twice<T>(x: T) -> T
where
T: Add<T, Output = T> + Copy,
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{
x + x
}
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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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}
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 {
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() {
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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
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ZERO == 0.0; //no error, comparison with zero is ok
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;
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;
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
x > 0.0;
x <= 0.0;
x >= 0.0;
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let xs: [f32; 1] = [0.0];
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let a: *const f32 = xs.as_ptr();
let b: *const f32 = xs.as_ptr();
assert_eq!(a, b); // no errors
// no errors - comparing signums is ok
let x32 = 3.21f32;
1.23f32.signum() == x32.signum();
1.23f32.signum() == -(x32.signum());
1.23f32.signum() == 3.21f32.signum();
1.23f32.signum() != x32.signum();
1.23f32.signum() != -(x32.signum());
1.23f32.signum() != 3.21f32.signum();
let x64 = 3.21f64;
1.23f64.signum() == x64.signum();
1.23f64.signum() == -(x64.signum());
1.23f64.signum() == 3.21f64.signum();
1.23f64.signum() != x64.signum();
1.23f64.signum() != -(x64.signum());
1.23f64.signum() != 3.21f64.signum();
}