std::pointer_traits::pointer_to
Defined in header <memory> | ? | ? |
|---|---|---|
static pointer pointer_to( element_type& r ); | (1) | (since C++11) (member of pointer_traits<Ptr> specialization) |
static pointer pointer_to( element_type& r ); | (2) | (since C++11) (member of pointer_traits<T*> specialization) |
为其参数构造可取消引用的指针或类似指针的对象%28“花式指针”%29。
1%29这个函数的版本在非专门化。std::pointer_traits模板只需调用Ptr::pointer_to(r)，如果PTR不提供静态成员函数pointer_to，此函数的实例化是编译时错误。
2%29该函数在专门化中的版本std::pointer_traits对于指针类型，返回std::addressof(r)
参数
r | - | reference to an object of type element_type&, except if element_type is void, in which case the type of r is unspecified |
|---|
返回值
指向r，类型指针的[医]性状<>：指针。
例外
1%29未指定的%28通常与Ptr::pointer_to%29
2%29
noexcept规格：
noexcept
注记
大Boost库版本函数的返回pointer(std::addressof(r))如果PTR：：指针[医]不存在。
另见
addressof (C++11) | obtains actual address of an object, even if the & operator is overloaded (function template) |
|---|---|
address (deprecated in C++17) | obtains the address of an object, even if operator& is overloaded (public member function of std::allocator) |
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