Implement P0040r3: Extending memory management tools

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@276544 91177308-0d34-0410-b5e6-96231b3b80d8

include/memory

@@ -180,6 +180,33 @@ template <class ForwardIterator, class Size, class T>
 ForwardIterator
 uninitialized_fill_n(ForwardIterator first, Size n, const T& x);
 
+template <class T>
+void destroy_at(T* location);
+
+template <class ForwardIterator>
+ void destroy(ForwardIterator first, ForwardIterator last);
+
+template <class ForwardIterator, class Size>
+ ForwardIterator destroy_n(ForwardIterator first, Size n);
+
+template <class InputIterator, class ForwardIterator>
+ ForwardIterator uninitialized_move(InputIterator first, InputIterator last, ForwardIterator result);
+
+template <class InputIterator, class Size, class ForwardIterator>
+ pair<InputIterator,ForwardIterator> uninitialized_move_n(InputIterator first, Size n, ForwardIterator result);
+
+template <class ForwardIterator>
+ void uninitialized_value_construct(ForwardIterator first, ForwardIterator last);
+
+template <class ForwardIterator, class Size>
+ ForwardIterator uninitialized_value_construct_n(ForwardIterator first, Size n);
+
+template <class ForwardIterator>
+ void uninitialized_default_construct(ForwardIterator first, ForwardIterator last);
+
+template <class ForwardIterator, class Size>
+ ForwardIterator uninitialized_default_construct_n(ForwardIterator first, Size n);
+
 template <class Y> struct auto_ptr_ref {};
 
 template<class X>
@@ -3671,6 +3698,87 @@ uninitialized_fill_n(_ForwardIterator __f, _Size __n, const _Tp& __x)
     return __f;
 }
 
+#if _LIBCPP_STD_VER > 14
+
+template <class _ForwardIterator>
+inline _LIBCPP_INLINE_VISIBILITY
+void uninitialized_default_construct(_ForwardIterator __first, _ForwardIterator __last) {
+    using _Vt = typename iterator_traits<_ForwardIterator>::value_type;
+    for (; __first != __last; ++__first)
+        ::new((void*)_VSTD::addressof(*__first)) _Vt;
+}
+
+template <class _ForwardIterator, class _Size>
+inline _LIBCPP_INLINE_VISIBILITY
+_ForwardIterator uninitialized_default_construct_n(_ForwardIterator __first, _Size __n) {
+    using _Vt = typename iterator_traits<_ForwardIterator>::value_type;
+    for (; __n > 0; (void)++__first, --__n)
+        ::new((void*)_VSTD::addressof(*__first)) _Vt;
+    return __first;
+}
+
+
+template <class _ForwardIterator>
+inline _LIBCPP_INLINE_VISIBILITY
+void uninitialized_value_construct(_ForwardIterator __first, _ForwardIterator __last) {
+    using _Vt = typename iterator_traits<_ForwardIterator>::value_type;
+    for (; __first != __last; ++__first)
+        ::new((void*)_VSTD::addressof(*__first)) _Vt();
+}
+
+template <class _ForwardIterator, class _Size>
+inline _LIBCPP_INLINE_VISIBILITY
+_ForwardIterator uninitialized_value_construct_n(_ForwardIterator __first, _Size __n) {
+    using _Vt = typename iterator_traits<_ForwardIterator>::value_type;
+    for (; __n > 0; (void)++__first, --__n)
+        ::new((void*)_VSTD::addressof(*__first)) _Vt();
+    return __first;
+}
+
+
+template <class _InputIt, class _ForwardIt>
+inline _LIBCPP_INLINE_VISIBILITY
+_ForwardIt uninitialized_move(_InputIt __first, _InputIt __last, _ForwardIt __res) {
+    using _Vt = typename iterator_traits<_ForwardIt>::value_type;
+    for (; __first != __last; (void)++__res, ++__first)
+        ::new((void*)_VSTD::addressof(*__res)) _Vt(std::move(*__first));
+    return __res;
+}
+
+template <class _InputIt, class _Size, class _ForwardIt>
+inline _LIBCPP_INLINE_VISIBILITY
+pair<_InputIt, _ForwardIt>
+uninitialized_move_n(_InputIt __first, _Size __n, _ForwardIt __res) {
+    using _Vt = typename iterator_traits<_ForwardIt>::value_type;
+    for (; __n > 0; ++__res, (void)++__first, --__n)
+        ::new((void*)_VSTD::addressof(*__res)) _Vt(std::move(*__first));
+    return {__first, __res};
+}
+
+template <class _Tp>
+inline _LIBCPP_INLINE_VISIBILITY
+void destroy_at(_Tp* __loc) {
+    _LIBCPP_ASSERT(__loc, "null pointer given to destroy_at");
+    __loc->~_Tp();
+}
+
+template <class _ForwardIterator>
+inline _LIBCPP_INLINE_VISIBILITY
+void destroy(_ForwardIterator __first, _ForwardIterator __last) {
+    for (; __first != __last; ++__first)
+        _VSTD::destroy_at(_VSTD::addressof(*__first));
+}
+
+template <class _ForwardIterator, class _Size>
+inline _LIBCPP_INLINE_VISIBILITY
+_ForwardIterator destroy_n(_ForwardIterator __first, _Size __n) {
+    for (; __n > 0; (void)++__first, --__n)
+        _VSTD::destroy_at(_VSTD::addressof(*__first));
+    return __first;
+}
+
+#endif // _LIBCPP_STD_VER > 14
+
 class _LIBCPP_EXCEPTION_ABI bad_weak_ptr
     : public std::exception
 {