d1605deab8
Since the values are stored in a u64 internally, we need to be mask away the high bits after applying the ! operator. Otherwise, these bits will be set to one, causing overflow.
22 lines
796 B
Rust
22 lines
796 B
Rust
// Copyright 2015 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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const U8_MAX_HALF: u8 = !0u8 / 2;
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const U16_MAX_HALF: u16 = !0u16 / 2;
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const U32_MAX_HALF: u32 = !0u32 / 2;
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const U64_MAX_HALF: u64 = !0u64 / 2;
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fn main() {
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assert_eq!(U8_MAX_HALF, 0x7f);
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assert_eq!(U16_MAX_HALF, 0x7fff);
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assert_eq!(U32_MAX_HALF, 0x7fff_ffff);
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assert_eq!(U64_MAX_HALF, 0x7fff_ffff_ffff_ffff);
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}
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