Function core::intrinsics::copysignf64

pub unsafe extern "rust-intrinsic" fn copysignf64(
    x: f64, 
    y: f64
) -> f64

🔬 This is a nightly-only experimental API. (core_intrinsics)

将 f64 值的符号从 y 复制到 x。

此内部函数的稳定版本是 f64::copysign