Implement P0163r0. Add shared_ptr::weak_type. This patch adds the weak_type typedef in shared_ptr. It is available in C++17 and newer. This patch also updates the _LIBCPP_STD_VER and TEST_STD_VER macros to have the value of 16, since 2016 is the current year. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@273839 91177308-0d34-0410-b5e6-96231b3b80d8 
diff --git a/include/memory b/include/memory index 47963e0..50a1f00 100644 --- a/include/memory +++ b/include/memory 
@@ -361,6 +361,7 @@  {  public:  typedef T element_type; + typedef weak_ptr<T> weak_type; // C++17    // constructors:  constexpr shared_ptr() noexcept; @@ -3863,6 +3864,9 @@  {  public:  typedef _Tp element_type; +#if _LIBCPP_STD_VER > 14 + typedef weak_ptr<_Tp> weak_type; +#endif  private:  element_type* __ptr_;  __shared_weak_count* __cntrl_;