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c688b401d3
Provide a standardized way to handle the C++ "standard" headers
customized to be used with current CMake C++ standard constraints.
Offer under directory `cm` headers which can be used as direct
replacements of the standard ones. For example:
#include <cm/string_view>
can be used safely for CMake development in place of the `<string_view>`
standard header.
Fixes: #19491
79 lines
1.5 KiB
C++
79 lines
1.5 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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#ifndef cm_iterator
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#define cm_iterator
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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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#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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#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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#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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#endif
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} // namespace cm
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#endif
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