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std::pointer_traits::pointer_to

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< cpp‎ | memory‎ | pointer traits
Revision as of 18:48, 26 August 2013 by P12 (Talk | contribs)

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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)

Constructs a dereferenceable pointer to its argument.

1) The version of this function in the non-specialized std::pointer_traits template simply calls Ptr::pointer_to(r), and if Ptr does not provide a static member function pointer_to, instantiation of this function is a compile-time error.
2) The version of this function in the specialization of std::pointer_traits for pointer types returns std::addressof(r)

Contents

[edit] Parameters

r - reference to an object of type element_type&, except if element_type is void, in which case the type of r is unspecified

[edit] Return value

A dereferenceable pointer to r, of the type pointer_traits<>::pointer.

[edit] Exceptions

1) Unspecified (typically same as Ptr::pointer_to)
2)
noexcept specification:  
noexcept
  

[edit] Notes

The boost library version of this function returns pointer(std::addressof(r)) if Ptr::pointer_to does not exist.

[edit] See also

(C++11)
obtains actual address of an object, even if the & operator is overloaded
(function template) [edit]
obtains the address of an object, even if operator& is overloaded
(public member function of std::allocator) [edit]