wowlab_engine_domain/
numeric.rs

1//! Domain-specific numeric conversions whose policies are not saturating casts.
2
3pub(crate) const fn wrapping_i64_to_i32(value: i64) -> i32 {
4    let [byte_0, byte_1, byte_2, byte_3, _, _, _, _] = value.to_le_bytes();
5
6    i32::from_le_bytes([byte_0, byte_1, byte_2, byte_3])
7}
8
9#[expect(
10    clippy::cast_possible_truncation,
11    reason = "rotation action payloads deliberately use compact f32 values"
12)]
13pub(crate) const fn rotation_payload_f32(value: f64) -> f32 {
14    // #t(rust_lossy_cast) rotation action payloads deliberately use compact f32 values
15    value as f32
16}
17
18#[cfg(test)]
19mod tests {
20    use googletest::prelude::*;
21
22    use super::*;
23
24    #[gtest]
25    fn explicit_width_conversions_preserve_current_boundary_semantics() {
26        expect_that!(wrapping_i64_to_i32(i64::from(i32::MAX) + 1), eq(i32::MIN));
27        expect_that!(wrapping_i64_to_i32(-1), eq(-1));
28        expect_that!(rotation_payload_f32(f64::NAN).is_nan(), is_true());
29        let positive_infinity = rotation_payload_f32(f64::INFINITY);
30
31        expect_that!(
32            positive_infinity.is_infinite() && positive_infinity.is_sign_positive(),
33            is_true()
34        );
35    }
36}
wowlab_engine_domain/numeric.rs

wowlab_engine_domain/
numeric.rs
