41 lines
1.0 KiB
Rust
41 lines
1.0 KiB
Rust
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// Copyright 2016 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(core_float)]
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#![feature(float_extras)]
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#![feature(untagged_unions)]
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extern crate core;
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use core::num::Float;
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union U {
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a: (u8, u8),
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b: u16,
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}
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union W {
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a: u32,
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b: f32,
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}
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fn main() {
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unsafe {
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let mut u = U { a: (1, 1) };
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assert_eq!(u.b, (1 << 8) + 1);
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u.b = (2 << 8) + 2;
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assert_eq!(u.a, (2, 2));
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let mut w = W { a: 0b0_11111111_00000000000000000000000 };
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assert_eq!(w.b, f32::infinity());
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w.b = f32::neg_infinity();
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assert_eq!(w.a, 0b1_11111111_00000000000000000000000);
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}
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}
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