LWG Issue 2128: Implement global cbegin/rbegin/cend/rbegin
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@189634 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/iterator b/include/iterator
index 979a964..d16aa2a 100644
--- a/include/iterator
+++ b/include/iterator
@@ -309,6 +309,19 @@
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 @@
#include <type_traits>
#include <cstddef>
#include <iosfwd>
+#include <initializer_list>
#ifdef __APPLE__
#include <Availability.h>
#endif
@@ -1405,6 +1419,67 @@
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 @@
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