mirror of https://github.com/rust-lang/rust
38 lines
961 B
Rust
38 lines
961 B
Rust
//@ run-pass
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//@ ignore-wasm32 wasi-libc does not have lgamma
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//@ ignore-sgx no libc
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use std::ffi::{c_double, c_int};
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use std::mem;
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fn to_c_int(v: &mut isize) -> &mut c_int {
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unsafe { mem::transmute_copy(&v) }
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}
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fn lgamma(n: c_double, value: &mut isize) -> c_double {
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unsafe {
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return m::lgamma(n, to_c_int(value));
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}
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}
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mod m {
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use std::ffi::{c_double, c_int};
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extern "C" {
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#[cfg(all(unix, not(target_os = "vxworks")))]
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#[link_name="lgamma_r"]
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pub fn lgamma(n: c_double, sign: &mut c_int) -> c_double;
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#[cfg(windows)]
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#[link_name = "lgamma"]
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pub fn lgamma(n: c_double, sign: &mut c_int) -> c_double;
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#[cfg(target_os = "vxworks")]
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#[link_name = "lgamma"]
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pub fn lgamma(n: c_double, sign: &mut c_int) -> c_double;
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}
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}
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pub fn main() {
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let mut y: isize = 5;
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let x: &mut isize = &mut y;
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assert_eq!(lgamma(1.0 as c_double, x), 0.0 as c_double);
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}
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