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std::pointer_traits

From cppreference.com
 
 
 
 
Defined in header <memory>
template< class Ptr > struct pointer_traits;
(1) (since C++11)
template< class T > struct pointer_traits<T*>;
(2) (since C++11)

The pointer_traits class template provides the standardized way to access certain properties of pointer-like types.

1) The non-specialized pointer_traits declares the following types:

Contents

[edit] Member types

Type Definition
pointer Ptr
element_type Ptr::element_type if present. Otherwise T if Ptr is a template instantiation Template<T, Args...>
difference_type Ptr::difference_type if present, otherwise std::ptrdiff_t

[edit] Member alias templates

Template Definition
template <class U> using rebind Ptr::rebind<U> if exists, otherwise Tempate<U, Args...> if Ptr is a template instantiation Template<T, Args...>

[edit] Member functions

[static]
obtains a dereferencable pointer to its argument
(public static member function)

2) A specialization is provided for pointer types, T*, which declares the following types

[edit] Member types

Type Definition
pointer T*
element_type T
difference_type std::ptrdiff_t

[edit] Member alias templates

Template Definition
template< class U > using rebind U*

[edit] Member functions

[static]
obtains a dereferencable pointer to its argument}
(public static member function)

[edit] See also

provides information about allocator types
(class template) [edit]
(C++11)
obtains actual address of an object, even if the & operator is overloaded
(function template) [edit]