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Implement P0163r0. Add shared_ptr::weak_type.

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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
This commit is contained in:
Eric Fiselier
2016-06-27 01:02:43 +00:00
parent 5781358757
commit 83d7ca9ea5
4 changed files with 12 additions and 2 deletions
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2
include/__config
View File

@@ -756,7 +756,7 @@ template <unsigned> struct __static_assert_check {};
# elif __cplusplus <= 201402L
# define _LIBCPP_STD_VER 14
# else
# define _LIBCPP_STD_VER 15 // current year, or date of c++17 ratification
# define _LIBCPP_STD_VER 16 // current year, or date of c++17 ratification
# endif
#endif // _LIBCPP_STD_VER

4
include/memory
View File

@@ -361,6 +361,7 @@ class shared_ptr
{
public:
typedef T element_type;
typedef weak_ptr<T> weak_type; // C++17
// constructors:
constexpr shared_ptr() noexcept;
@@ -3863,6 +3864,9 @@ class _LIBCPP_TYPE_VIS_ONLY shared_ptr
{
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_;

6
test/std/utilities/memory/util.smartptr/util.smartptr.shared/types.pass.cpp
View File

@@ -13,14 +13,20 @@
// {
// public:
// typedef T element_type;
// typedef weak_ptr<T> weak_type; // C++17
// ...
// };
#include <memory>
#include "test_macros.h"
struct A; // purposefully incomplete
int main()
{
static_assert((std::is_same<std::shared_ptr<A>::element_type, A>::value), "");
#if TEST_STD_VER > 14
static_assert((std::is_same<std::shared_ptr<A>::weak_type, std::weak_ptr<A>>::value), "");
#endif
}

2
test/support/test_macros.h
View File

@@ -43,7 +43,7 @@
#elif __cplusplus <= 201402L
# define TEST_STD_VER 14
#else
# define TEST_STD_VER 99 // greater than current standard
# define TEST_STD_VER 16 // current year; greater than current standard
#endif
#endif