50 lines
1.2 KiB
Rust
50 lines
1.2 KiB
Rust
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(libc)]
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extern crate libc;
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use std::mem;
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use libc::{c_double, c_int};
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fn to_c_int(v: &mut isize) -> &mut c_int {
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unsafe {
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mem::transmute_copy(&v)
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}
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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 libc::{c_double, c_int};
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#[link_name = "m"]
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extern {
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#[cfg(unix)]
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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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}
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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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