#![warn(clippy::float_cmp)] #![allow(unused, clippy::no_effect, clippy::unnecessary_operation, clippy::cast_lossless)] 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> + 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 // 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(); }