cmath.rs.html -- source
Description: Source to the Rust file `src\libstd\sys\windows\cmath.rs`.
Keywords: rust, rustlang, rust-lang

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    #![cfg(not(test))]

    use libc::{c_double, c_float};

    extern "C" {
        pub fn acos(n: c_double) -> c_double;
        pub fn asin(n: c_double) -> c_double;
        pub fn atan(n: c_double) -> c_double;
        pub fn atan2(a: c_double, b: c_double) -> c_double;
        pub fn cbrt(n: c_double) -> c_double;
        pub fn cbrtf(n: c_float) -> c_float;
        pub fn cosh(n: c_double) -> c_double;
        pub fn expm1(n: c_double) -> c_double;
        pub fn expm1f(n: c_float) -> c_float;
        pub fn fdim(a: c_double, b: c_double) -> c_double;
        pub fn fdimf(a: c_float, b: c_float) -> c_float;
        #[cfg_attr(target_env = "msvc", link_name = "_hypot")]
        pub fn hypot(x: c_double, y: c_double) -> c_double;
        #[cfg_attr(target_env = "msvc", link_name = "_hypotf")]
        pub fn hypotf(x: c_float, y: c_float) -> c_float;
        pub fn log1p(n: c_double) -> c_double;
        pub fn log1pf(n: c_float) -> c_float;
        pub fn sinh(n: c_double) -> c_double;
        pub fn tan(n: c_double) -> c_double;
        pub fn tanh(n: c_double) -> c_double;
    }

    pub use self::shims::*;

    #[cfg(not(all(target_env = "msvc", target_arch = "x86")))]
    mod shims {
        use libc::c_float;

        extern "C" {
            pub fn acosf(n: c_float) -> c_float;
            pub fn asinf(n: c_float) -> c_float;
            pub fn atan2f(a: c_float, b: c_float) -> c_float;
            pub fn atanf(n: c_float) -> c_float;
            pub fn coshf(n: c_float) -> c_float;
            pub fn sinhf(n: c_float) -> c_float;
            pub fn tanf(n: c_float) -> c_float;
            pub fn tanhf(n: c_float) -> c_float;
        }
    }

    // On 32-bit x86 MSVC these functions aren't defined, so we just define shims
    // which promote everything fo f64, perform the calculation, and then demote
    // back to f32. While not precisely correct should be "correct enough" for now.
    #[cfg(all(target_env = "msvc", target_arch = "x86"))]
    mod shims {
        use libc::c_float;

        #[inline]
        pub unsafe fn acosf(n: c_float) -> c_float {
            f64::acos(n as f64) as c_float
        }

        #[inline]
        pub unsafe fn asinf(n: c_float) -> c_float {
            f64::asin(n as f64) as c_float
        }

        #[inline]
        pub unsafe fn atan2f(n: c_float, b: c_float) -> c_float {
            f64::atan2(n as f64, b as f64) as c_float
        }

        #[inline]
        pub unsafe fn atanf(n: c_float) -> c_float {
            f64::atan(n as f64) as c_float
        }

        #[inline]
        pub unsafe fn coshf(n: c_float) -> c_float {
            f64::cosh(n as f64) as c_float
        }

        #[inline]
        pub unsafe fn sinhf(n: c_float) -> c_float {
            f64::sinh(n as f64) as c_float
        }

        #[inline]
        pub unsafe fn tanf(n: c_float) -> c_float {
            f64::tan(n as f64) as c_float
        }

        #[inline]
        pub unsafe fn tanhf(n: c_float) -> c_float {
            f64::tanh(n as f64) as c_float
        }
    }