std::addressof

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Elemento definito nell'header <memory>
template<class T >
T* addressof(T& arg);
(dal C++11)

Obtains the actual address of the object or function arg, even in presence of overloaded operator&

Indice

[modifica]Parametri

arg - lvalue object or function

[modifica]Valore di ritorno

Pointer to arg.

[modifica]Eccezioni

noexcept specification:  
noexcept
  (dal C++11)

[modifica]Possibile implementazione

template<class T > T* addressof(T& arg){return(T*)&(char&)arg;}

[modifica]Esempio

operator& may be overloaded for a pointer wrapper class to obtain a pointer to pointer:

#include <iostream>#include <memory>   template<class T>struct Ptr { T* data; Ptr(T* arg): data(arg){} ~Ptr(){delete data;} T** operator&(){return&data;}};   template<class T>void f(Ptr<T>* p){std::cout<<"Ptr overload called with p = "<< p <<'\n';}   void f(int** p){std::cout<<"int** overload called with p = "<< p <<'\n';}   int main(){ Ptr<int> p(new int(42)); f(&p);// calls int** overload f(std::addressof(p));// calls Ptr<int>* overload}

Output:

int** overload called with p = 0012FF64 Ptr overload called with p = 0012FF64

[modifica]Vedi anche

the default allocator
(classe template)[modifica]
fornisce informazioni su come i tipi di puntatore
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provides information about pointer-like types
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(classe template)[modifica]
close