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bdca8b01d2
#pragma once is a widely supported compiler pragma, even though it is not part of the C++ standard. Many of the issues keeping #pragma once from being standardized (distributed filesystems, build farms, hard links, etc.) do not apply to CMake - it is easy to build CMake on a single machine. CMake also does not install any header files which can be consumed by other projects (though cmCPluginAPI.h has been deliberately omitted from this conversion in case anyone is still using it.) Finally, #pragma once has been required to build CMake since at least August 2017 (7f29bbe6enabled server mode unconditionally, which had been using #pragma once since September 2016 (b13d3e0d)). The fact that we now require C++11 filters out old compilers, and it is unlikely that there is a compiler which supports C++11 but does not support #pragma once.
214 lines
4.0 KiB
C++
214 lines
4.0 KiB
C++
// -*-c++-*-
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// vim: set ft=cpp:
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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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file Copyright.txt or https://cmake.org/licensing for details. */
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#pragma once
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#include <iterator> // IWYU pragma: export
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namespace cm {
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#if __cplusplus >= 201402L || defined(_MSVC_LANG) && _MSVC_LANG >= 201402L
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using std::make_reverse_iterator;
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using std::cbegin;
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using std::cend;
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using std::rbegin;
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using std::rend;
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using std::crbegin;
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using std::crend;
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#else
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template <class Iter>
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std::reverse_iterator<Iter> make_reverse_iterator(Iter it)
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{
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return std::reverse_iterator<Iter>(it);
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}
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// std::c{begin,end} backport from C++14
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template <class C>
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# if defined(_MSC_VER) && _MSC_VER < 1900
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auto cbegin(C const& c)
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# else
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constexpr auto cbegin(C const& c) noexcept(noexcept(std::begin(c)))
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# endif
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-> decltype(std::begin(c))
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{
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return std::begin(c);
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}
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template <class C>
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# if defined(_MSC_VER) && _MSC_VER < 1900
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auto cend(C const& c)
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# else
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constexpr auto cend(C const& c) noexcept(noexcept(std::end(c)))
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# endif
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-> decltype(std::end(c))
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{
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return std::end(c);
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}
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// std::r{begin,end} backport from C++14
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template <class C>
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# if !defined(_MSC_VER) || _MSC_VER >= 1900
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constexpr
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# endif
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auto
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rbegin(C& c) -> decltype(c.rbegin())
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{
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return c.rbegin();
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}
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template <class C>
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# if !defined(_MSC_VER) || _MSC_VER >= 1900
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constexpr
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# endif
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auto
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rbegin(C const& c) -> decltype(c.rbegin())
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{
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return c.rbegin();
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}
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template <typename T, size_t N>
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# if !defined(_MSC_VER) || _MSC_VER >= 1900
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constexpr
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# endif
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std::reverse_iterator<T*>
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rbegin(T (&arr)[N])
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{
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return std::reverse_iterator<T*>(arr + N);
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}
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template <class C>
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# if !defined(_MSC_VER) || _MSC_VER >= 1900
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constexpr
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# endif
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auto
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rend(C& c) -> decltype(c.rend())
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{
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return c.rend();
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}
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template <class C>
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# if !defined(_MSC_VER) || _MSC_VER >= 1900
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constexpr
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# endif
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auto
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rend(C const& c) -> decltype(c.rend())
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{
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return c.rend();
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}
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template <typename T, size_t N>
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# if !defined(_MSC_VER) || _MSC_VER >= 1900
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constexpr
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# endif
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std::reverse_iterator<T*>
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rend(T (&arr)[N])
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{
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return std::reverse_iterator<T*>(arr);
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}
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// std::cr{begin,end} backport from C++14
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template <class C>
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# if !defined(_MSC_VER) || _MSC_VER >= 1900
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constexpr
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# endif
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auto
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crbegin(C const& c) -> decltype(cm::rbegin(c))
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{
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return cm::rbegin(c);
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}
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template <class C>
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# if !defined(_MSC_VER) || _MSC_VER >= 1900
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constexpr
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# endif
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auto
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crend(C const& c) -> decltype(cm::rend(c))
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{
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return cm::rend(c);
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}
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#endif
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#if __cplusplus >= 201703L || defined(_MSVC_LANG) && _MSVC_LANG >= 201703L
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using std::size;
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using std::empty;
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using std::data;
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#else
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// std::size backport from C++17.
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template <class C>
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# if !defined(_MSC_VER) || _MSC_VER >= 1900
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constexpr
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# endif
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auto
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size(C const& c) -> decltype(c.size())
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{
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return c.size();
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}
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template <typename T, size_t N>
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# if !defined(_MSC_VER) || _MSC_VER >= 1900
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constexpr
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# endif
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std::size_t
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size(const T (&)[N]) throw()
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{
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return N;
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}
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// std::empty backport from C++17.
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template <class C>
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# if defined(_MSC_VER) && _MSC_VER < 1900
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auto empty(C const& c)
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# else
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constexpr auto empty(C const& c) noexcept(noexcept(c.empty()))
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# endif
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-> decltype(c.empty())
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{
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return c.empty();
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}
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template <typename T, size_t N>
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# if defined(_MSC_VER) && _MSC_VER < 1900
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bool empty(const T (&)[N])
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# else
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constexpr bool empty(const T (&)[N]) noexcept
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# endif
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{
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return false;
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}
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// std::data backport from C++17.
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template <class C>
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# if defined(_MSC_VER) && _MSC_VER < 1900
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auto data(C const& c)
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# else
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constexpr auto data(C const& c) noexcept(noexcept(c.data()))
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# endif
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-> decltype(c.data())
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{
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return c.data();
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}
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template <class C>
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# if defined(_MSC_VER) && _MSC_VER < 1900
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auto data(C& c)
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# else
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constexpr auto data(C& c) noexcept(noexcept(c.data()))
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# endif
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-> decltype(c.data())
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{
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return c.data();
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}
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template <typename T, size_t N>
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# if defined(_MSC_VER) && _MSC_VER < 1900
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T* data(T (&)[N])
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# else
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constexpr T* data(T (&arr)[N]) noexcept
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# endif
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{
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return arr;
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}
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#endif
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} // namespace cm
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