rust-clippy/tests/ui/cast.rs

#[warn(
    clippy::cast_precision_loss,
    clippy::cast_possible_truncation,
    clippy::cast_sign_loss,
    clippy::cast_possible_wrap
)]
#[allow(clippy::no_effect, clippy::unnecessary_operation)]
fn main() {
    // Test clippy::cast_precision_loss
    let x0 = 1i32;
    x0 as f32;
    let x1 = 1i64;
    x1 as f32;
    x1 as f64;
    let x2 = 1u32;
    x2 as f32;
    let x3 = 1u64;
    x3 as f32;
    x3 as f64;
    // Test clippy::cast_possible_truncation
    1f32 as i32;
    1f32 as u32;
    1f64 as f32;
    1i32 as i8;
    1i32 as u8;
    1f64 as isize;
    1f64 as usize;
    // Test clippy::cast_possible_wrap
    1u8 as i8;
    1u16 as i16;
    1u32 as i32;
    1u64 as i64;
    1usize as isize;
    // Test clippy::cast_sign_loss
    1i32 as u32;
    -1i32 as u32;
    1isize as usize;
    -1isize as usize;
    0i8 as u8;
    i8::MAX as u8;
    i16::MAX as u16;
    i32::MAX as u32;
    i64::MAX as u64;
    i128::MAX as u128;

    (-1i8).abs() as u8;
    (-1i16).abs() as u16;
    (-1i32).abs() as u32;
    (-1i64).abs() as u64;
    (-1isize).abs() as usize;

    (-1i8).checked_abs().unwrap() as u8;
    (-1i16).checked_abs().unwrap() as u16;
    (-1i32).checked_abs().unwrap() as u32;
    (-1i64).checked_abs().unwrap() as u64;
    (-1isize).checked_abs().unwrap() as usize;

    (-1i8).rem_euclid(1i8) as u8;
    (-1i8).rem_euclid(1i8) as u16;
    (-1i16).rem_euclid(1i16) as u16;
    (-1i16).rem_euclid(1i16) as u32;
    (-1i32).rem_euclid(1i32) as u32;
    (-1i32).rem_euclid(1i32) as u64;
    (-1i64).rem_euclid(1i64) as u64;
    (-1i64).rem_euclid(1i64) as u128;
    (-1isize).rem_euclid(1isize) as usize;
    (1i8).rem_euclid(-1i8) as u8;
    (1i8).rem_euclid(-1i8) as u16;
    (1i16).rem_euclid(-1i16) as u16;
    (1i16).rem_euclid(-1i16) as u32;
    (1i32).rem_euclid(-1i32) as u32;
    (1i32).rem_euclid(-1i32) as u64;
    (1i64).rem_euclid(-1i64) as u64;
    (1i64).rem_euclid(-1i64) as u128;
    (1isize).rem_euclid(-1isize) as usize;

    (-1i8).checked_rem_euclid(1i8).unwrap() as u8;
    (-1i8).checked_rem_euclid(1i8).unwrap() as u16;
    (-1i16).checked_rem_euclid(1i16).unwrap() as u16;
    (-1i16).checked_rem_euclid(1i16).unwrap() as u32;
    (-1i32).checked_rem_euclid(1i32).unwrap() as u32;
    (-1i32).checked_rem_euclid(1i32).unwrap() as u64;
    (-1i64).checked_rem_euclid(1i64).unwrap() as u64;
    (-1i64).checked_rem_euclid(1i64).unwrap() as u128;
    (-1isize).checked_rem_euclid(1isize).unwrap() as usize;
    (1i8).checked_rem_euclid(-1i8).unwrap() as u8;
    (1i8).checked_rem_euclid(-1i8).unwrap() as u16;
    (1i16).checked_rem_euclid(-1i16).unwrap() as u16;
    (1i16).checked_rem_euclid(-1i16).unwrap() as u32;
    (1i32).checked_rem_euclid(-1i32).unwrap() as u32;
    (1i32).checked_rem_euclid(-1i32).unwrap() as u64;
    (1i64).checked_rem_euclid(-1i64).unwrap() as u64;
    (1i64).checked_rem_euclid(-1i64).unwrap() as u128;
    (1isize).checked_rem_euclid(-1isize).unwrap() as usize;

    // no lint for `cast_possible_truncation`
    // with `signum` method call (see issue #5395)
    let x: i64 = 5;
    let _ = x.signum() as i32;

    let s = x.signum();
    let _ = s as i32;

    // Test for signed min
    (-99999999999i64).min(1) as i8; // should be linted because signed

    // Test for various operations that remove enough bits for the result to fit
    (999999u64 & 1) as u8;
    (999999u64 % 15) as u8;
    (999999u64 / 0x1_0000_0000_0000) as u16;
    ({ 999999u64 >> 56 }) as u8;
    ({
        let x = 999999u64;
        x.min(1)
    }) as u8;
    999999u64.clamp(0, 255) as u8;
    999999u64.clamp(0, 256) as u8; // should still be linted
}