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// -*-c++-*-
// vim: set ft=cpp:
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#ifndef cm_iterator
#define cm_iterator
#include <iterator> // IWYU pragma: export
namespace cm {
#if __cplusplus >= 201402L || defined(_MSVC_LANG) && _MSVC_LANG >= 201402L
using std::make_reverse_iterator;
using std::cbegin;
using std::cend;
using std::rbegin;
using std::rend;
using std::crbegin;
using std::crend;
#else
template <class Iter>
std::reverse_iterator<Iter> make_reverse_iterator(Iter it)
{
return std::reverse_iterator<Iter>(it);
}
// std::c{begin,end} backport from C++14
template <class C>
# if defined(_MSC_VER) && _MSC_VER < 1900
auto cbegin(C const& c)
# else
constexpr auto cbegin(C const& c) noexcept(noexcept(std::begin(c)))
# endif
-> decltype(std::begin(c))
{
return std::begin(c);
}
template <class C>
# if defined(_MSC_VER) && _MSC_VER < 1900
auto cend(C const& c)
# else
constexpr auto cend(C const& c) noexcept(noexcept(std::end(c)))
# endif
-> decltype(std::end(c))
{
return std::end(c);
}
// std::r{begin,end} backport from C++14
template <class C>
# if !defined(_MSC_VER) || _MSC_VER >= 1900
constexpr
# endif
auto
rbegin(C& c) -> decltype(c.rbegin())
{
return c.rbegin();
}
template <class C>
# if !defined(_MSC_VER) || _MSC_VER >= 1900
constexpr
# endif
auto
rbegin(C const& c) -> decltype(c.rbegin())
{
return c.rbegin();
}
template <typename T, size_t N>
# if !defined(_MSC_VER) || _MSC_VER >= 1900
constexpr
# endif
std::reverse_iterator<T*>
rbegin(T (&arr)[N])
{
return std::reverse_iterator<T*>(arr + N);
}
template <class C>
# if !defined(_MSC_VER) || _MSC_VER >= 1900
constexpr
# endif
auto
rend(C& c) -> decltype(c.rend())
{
return c.rend();
}
template <class C>
# if !defined(_MSC_VER) || _MSC_VER >= 1900
constexpr
# endif
auto
rend(C const& c) -> decltype(c.rend())
{
return c.rend();
}
template <typename T, size_t N>
# if !defined(_MSC_VER) || _MSC_VER >= 1900
constexpr
# endif
std::reverse_iterator<T*>
rend(T (&arr)[N])
{
return std::reverse_iterator<T*>(arr);
}
// std::cr{begin,end} backport from C++14
template <class C>
# if !defined(_MSC_VER) || _MSC_VER >= 1900
constexpr
# endif
auto
crbegin(C const& c) -> decltype(cm::rbegin(c))
{
return cm::rbegin(c);
}
template <class C>
# if !defined(_MSC_VER) || _MSC_VER >= 1900
constexpr
# endif
auto
crend(C const& c) -> decltype(cm::rend(c))
{
return cm::rend(c);
}
#endif
#if __cplusplus >= 201703L || defined(_MSVC_LANG) && _MSVC_LANG >= 201703L
using std::size;
using std::empty;
using std::data;
#else
// std::size backport from C++17.
template <class C>
# if !defined(_MSC_VER) || _MSC_VER >= 1900
constexpr
# endif
auto
size(C const& c) -> decltype(c.size())
{
return c.size();
}
template <typename T, size_t N>
# if !defined(_MSC_VER) || _MSC_VER >= 1900
constexpr
# endif
std::size_t
size(const T (&)[N]) throw()
{
return N;
}
// std::empty backport from C++17.
template <class C>
# if defined(_MSC_VER) && _MSC_VER < 1900
auto empty(C const& c)
# else
constexpr auto empty(C const& c) noexcept(noexcept(c.empty()))
# endif
-> decltype(c.empty())
{
return c.empty();
}
template <typename T, size_t N>
# if defined(_MSC_VER) && _MSC_VER < 1900
bool empty(const T (&)[N])
# else
constexpr bool empty(const T (&)[N]) noexcept
# endif
{
return false;
}
// std::data backport from C++17.
template <class C>
# if defined(_MSC_VER) && _MSC_VER < 1900
auto data(C const& c)
# else
constexpr auto data(C const& c) noexcept(noexcept(c.data()))
# endif
-> decltype(c.data())
{
return c.data();
}
template <class C>
# if defined(_MSC_VER) && _MSC_VER < 1900
auto data(C& c)
# else
constexpr auto data(C& c) noexcept(noexcept(c.data()))
# endif
-> decltype(c.data())
{
return c.data();
}
template <typename T, size_t N>
# if defined(_MSC_VER) && _MSC_VER < 1900
T* data(T (&)[N])
# else
constexpr T* data(T (&arr)[N]) noexcept
# endif
{
return arr;
}
#endif
} // namespace cm
#endif
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