134 lines
3.5 KiB
Rust
134 lines
3.5 KiB
Rust
// Copyright 2013 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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//! Operations on boolean values (`bool` type)
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//!
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//! A `to_bit` conversion function.
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use num::{Int, one, zero};
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/////////////////////////////////////////////////////////////////////////////
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// Freestanding functions
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/////////////////////////////////////////////////////////////////////////////
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/// Convert a `bool` to an integer.
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///
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/// # Examples
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///
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/// ```rust
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/// use std::bool;
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///
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/// assert_eq!(bool::to_bit::<u8>(true), 1u8);
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/// assert_eq!(bool::to_bit::<u8>(false), 0u8);
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/// ```
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#[inline]
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pub fn to_bit<N: Int>(p: bool) -> N {
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if p { one() } else { zero() }
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}
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#[cfg(test)]
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mod tests {
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use realstd::prelude::*;
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use super::to_bit;
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#[test]
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fn test_to_bit() {
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assert_eq!(to_bit::<u8>(true), 1u8);
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assert_eq!(to_bit::<u8>(false), 0u8);
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}
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#[test]
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fn test_eq() {
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assert_eq!(false.eq(&true), false);
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assert_eq!(false == false, true);
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assert_eq!(false != true, true);
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assert_eq!(false.ne(&false), false);
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}
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#[test]
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fn test_bitand() {
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assert_eq!(false.bitand(&false), false);
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assert_eq!(true.bitand(&false), false);
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assert_eq!(false.bitand(&true), false);
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assert_eq!(true.bitand(&true), true);
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assert_eq!(false & false, false);
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assert_eq!(true & false, false);
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assert_eq!(false & true, false);
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assert_eq!(true & true, true);
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}
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#[test]
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fn test_bitor() {
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assert_eq!(false.bitor(&false), false);
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assert_eq!(true.bitor(&false), true);
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assert_eq!(false.bitor(&true), true);
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assert_eq!(true.bitor(&true), true);
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assert_eq!(false | false, false);
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assert_eq!(true | false, true);
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assert_eq!(false | true, true);
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assert_eq!(true | true, true);
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}
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#[test]
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fn test_bitxor() {
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assert_eq!(false.bitxor(&false), false);
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assert_eq!(true.bitxor(&false), true);
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assert_eq!(false.bitxor(&true), true);
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assert_eq!(true.bitxor(&true), false);
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assert_eq!(false ^ false, false);
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assert_eq!(true ^ false, true);
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assert_eq!(false ^ true, true);
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assert_eq!(true ^ true, false);
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}
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#[test]
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fn test_not() {
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assert_eq!(!true, false);
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assert_eq!(!false, true);
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}
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#[test]
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fn test_to_str() {
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let s = false.to_str();
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assert_eq!(s.as_slice(), "false");
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let s = true.to_str();
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assert_eq!(s.as_slice(), "true");
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}
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#[test]
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fn test_ord() {
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assert!(true > false);
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assert!(!(false > true));
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assert!(false < true);
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assert!(!(true < false));
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assert!(false <= false);
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assert!(false >= false);
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assert!(true <= true);
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assert!(true >= true);
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assert!(false <= true);
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assert!(!(false >= true));
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assert!(true >= false);
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assert!(!(true <= false));
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}
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#[test]
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fn test_totalord() {
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assert!(true.cmp(&true) == Equal);
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assert!(false.cmp(&false) == Equal);
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assert!(true.cmp(&false) == Greater);
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assert!(false.cmp(&true) == Less);
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}
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}
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