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LWG Issue 2128: Implement global cbegin/rbegin/cend/rbegin

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@189634 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2013-08-30 01:17:07 +00:00
parent 161a9bf447
commit 09da3c053c
3 changed files with 232 additions and 1 deletions
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106
include/iterator
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@@ -309,6 +309,19 @@ template <class C> auto end(const C& c) -> decltype(c.end());
template <class T, size_t N> T* begin(T (&array)[N]);
template <class T, size_t N> T* end(T (&array)[N]);
template <class C> auto cbegin(const C& c) -> decltype(std::begin(c)); // C++14
template <class C> auto cend(const C& c) -> decltype(std::end(c)); // C++14
template <class C> auto rbegin(C& c) -> decltype(c.rbegin()); // C++14
template <class C> auto rbegin(const C& c) -> decltype(c.rbegin()); // C++14
template <class C> auto rend(C& c) -> decltype(c.rend()); // C++14
template <class C> auto rend(const C& c) -> decltype(c.rend()); // C++14
template <class E> reverse_iterator<const E*> rbegin(initializer_list<E> il); // C++14
template <class E> reverse_iterator<const E*> rend(initializer_list<E> il); // C++14
template <class T, size_t N> reverse_iterator<T*> rbegin(T (&array)[N]); // C++14
template <class T, size_t N> reverse_iterator<T*> rend(T (&array)[N]); // C++14
template <class C> auto crbegin(const C& c) -> decltype(std::rbegin(c)); // C++14
template <class C> auto crend(const C& c) -> decltype(std::rend(c)); // C++14
} // std
*/
@@ -317,6 +330,7 @@ template <class T, size_t N> T* end(T (&array)[N]);
#include <type_traits>
#include <cstddef>
#include <iosfwd>
#include <initializer_list>
#ifdef __APPLE__
#include <Availability.h>
#endif
@@ -1405,6 +1419,67 @@ end(const _Cp& __c) -> decltype(__c.end())
return __c.end();
}
#if _LIBCPP_STD_VER > 11
template <class _Cp>
inline _LIBCPP_INLINE_VISIBILITY
auto cbegin(const _Cp& __c) -> decltype(begin(__c))
{
return __c.begin();
}
template <class _Cp>
inline _LIBCPP_INLINE_VISIBILITY
auto cend(const _Cp& __c) -> decltype(end(__c))
{
return __c.end();
}
template <class _Cp>
inline _LIBCPP_INLINE_VISIBILITY
auto rbegin(_Cp& __c) -> decltype(__c.rbegin())
{
return __c.rbegin();
}
template <class _Cp>
inline _LIBCPP_INLINE_VISIBILITY
auto rbegin(const _Cp& __c) -> decltype(__c.rbegin())
{
return __c.rbegin();
}
template <class _Cp>
inline _LIBCPP_INLINE_VISIBILITY
auto rend(_Cp& __c) -> decltype(__c.rend())
{
return __c.rend();
}
template <class _Cp>
inline _LIBCPP_INLINE_VISIBILITY
auto rend(const _Cp& __c) -> decltype(__c.rend())
{
return __c.rend();
}
template <class _Cp>
inline _LIBCPP_INLINE_VISIBILITY
auto crbegin(const _Cp& __c) -> decltype(rbegin(__c))
{
return rbegin(__c);
}
template <class _Cp>
inline _LIBCPP_INLINE_VISIBILITY
auto crend(const _Cp& __c) -> decltype(rend(__c))
{
return rend(__c);
}
#endif
#else // !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_TRAILING_RETURN)
template <class _Cp>
@@ -1457,6 +1532,37 @@ end(_Tp (&__array)[_Np])
return __array + _Np;
}
#if _LIBCPP_STD_VER > 11
template <class _Tp, size_t _Np>
inline _LIBCPP_INLINE_VISIBILITY
reverse_iterator<_Tp*> rbegin(_Tp (&__array)[_Np])
{
return reverse_iterator<_Tp*>(__array + _Np);
}
template <class _Tp, size_t _Np>
inline _LIBCPP_INLINE_VISIBILITY
reverse_iterator<_Tp*> rend(_Tp (&__array)[_Np])
{
return reverse_iterator<_Tp*>(__array);
}
template <class _Ep>
inline _LIBCPP_INLINE_VISIBILITY
reverse_iterator<const _Ep*> rbegin(initializer_list<_Ep> __il)
{
return reverse_iterator<const _Ep*>(__il.end());
}
template <class _Ep>
inline _LIBCPP_INLINE_VISIBILITY
reverse_iterator<const _Ep*> rend(initializer_list<_Ep> __il)
{
return reverse_iterator<const _Ep*>(__il.begin());
}
#endif
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_ITERATOR