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95bbaa1ec2
I have added the to_byte method and updated the unit tests. This gives slightly nicer syntax than static_cast, is better than the c-style cast used in the unit test. See: https://github.com/Microsoft/GSL/issues/329#issuecomment-240588515
132 lines
3.5 KiB
Plaintext
132 lines
3.5 KiB
Plaintext
///////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
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//
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// This code is licensed under the MIT License (MIT).
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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///////////////////////////////////////////////////////////////////////////////
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#pragma once
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#ifndef GSL_BYTE_H
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#define GSL_BYTE_H
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#ifdef _MSC_VER
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// MSVC 2013 workarounds
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#if _MSC_VER <= 1800
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// constexpr is not understood
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#pragma push_macro("constexpr")
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#define constexpr /*constexpr*/
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// noexcept is not understood
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#pragma push_macro("noexcept")
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#define noexcept /*noexcept*/
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#endif // _MSC_VER <= 1800
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#endif // _MSC_VER
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namespace gsl
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{
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// This is a simple definition for now that allows
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// use of byte within span<> to be standards-compliant
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enum class byte : unsigned char
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{
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};
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template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
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constexpr byte& operator<<=(byte& b, IntegerType shift) noexcept
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{
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return b = byte(static_cast<unsigned char>(b) << shift);
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}
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template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
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constexpr byte operator<<(byte b, IntegerType shift) noexcept
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{
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return byte(static_cast<unsigned char>(b) << shift);
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}
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template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
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constexpr byte& operator>>=(byte& b, IntegerType shift) noexcept
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{
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return b = byte(static_cast<unsigned char>(b) >> shift);
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}
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template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
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constexpr byte operator>>(byte b, IntegerType shift) noexcept
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{
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return byte(static_cast<unsigned char>(b) >> shift);
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}
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constexpr byte& operator|=(byte& l, byte r) noexcept
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{
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return l = byte(static_cast<unsigned char>(l) | static_cast<unsigned char>(r));
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}
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constexpr byte operator|(byte l, byte r) noexcept
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{
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return byte(static_cast<unsigned char>(l) + static_cast<unsigned char>(r));
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}
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constexpr byte& operator&=(byte& l, byte r) noexcept
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{
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return l = byte(static_cast<unsigned char>(l) & static_cast<unsigned char>(r));
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}
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constexpr byte operator&(byte l, byte r) noexcept
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{
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return byte(static_cast<unsigned char>(l) & static_cast<unsigned char>(r));
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}
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constexpr byte& operator^=(byte& l, byte r) noexcept
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{
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return l = byte(static_cast<unsigned char>(l) ^ static_cast<unsigned char>(r));
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}
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constexpr byte operator^(byte l, byte r) noexcept
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{
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return byte(static_cast<unsigned char>(l) ^ static_cast<unsigned char>(r));
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}
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constexpr byte operator~(byte b) noexcept { return byte(~static_cast<unsigned char>(b)); }
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template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
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constexpr IntegerType to_integer(byte b) noexcept
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{
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return {b};
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}
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constexpr byte to_byte(unsigned char i) noexcept
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{
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return static_cast<byte>(i);
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}
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} // namespace gsl
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#ifdef _MSC_VER
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#if _MSC_VER <= 1800
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#undef constexpr
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#pragma pop_macro("constexpr")
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#undef noexcept
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#pragma pop_macro("noexcept")
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#endif // _MSC_VER <= 1800
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#endif // _MSC_VER
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#endif // GSL_BYTE_H
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