std::pointer_traits<Ptr>::pointer_to
Defined in header <memory> |
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(1) | (since C++11) (member of pointer_traits<Ptr> specialization) |
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(since C++11) (until C++20) (member of pointer_traits<T*> specialization) |
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(since C++20) (member of pointer_traits<T*> specialization) |
Constructs a dereferenceable pointer or pointer-like object ("fancy 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).
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 |
Return value
A dereferenceable pointer to r, of the type pointer_traits<>::pointer.
Exceptions
1) Unspecified (typically same as
Ptr::pointer_to).
Notes
The Boost.Intrusive library version of this function returns pointer(std::addressof(r)) if Ptr::pointer_to does not exist.
See also
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(C++11)
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obtains actual address of an object, even if the & operator is overloaded (function template) |
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(until C++20)
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obtains the address of an object, even if operator& is overloaded (public member function of std::allocator<T>) |
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[static] (C++20)(optional)
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obtains a raw pointer from a fancy pointer (inverse of pointer_to) (public static member function) |
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(C++20)
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obtains a raw pointer from a pointer-like type (function template) |
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