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std::addressof

De cppreference.com
< cpp‎ | memory

 
 
Utilidades de la biblioteca
Escriba apoyo (basic types, RTTI, type traits)
Gestión de memoria dinámica
Gestión de errores
Programa de servicios públicos
Funciones variadic
Fecha y hora
Objetos Function
(C++11)
Operadores relacionales
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Relational operators
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Pares y tuplas
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Pairs and tuples
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(C++11)
Cambiar, hacia adelante y mover
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Swap, forward and move
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(C++11)
(C++11)
(C++11)
 
Gestión de memoria dinámica
Bajo la gestión de memoria de nivel
Los asignadores
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Allocators
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Inicializar el almacenamiento
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Uninitialized storage
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Punteros inteligentes
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Smart pointers
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(C++11)
(C++11)
(C++11)
(obsoleto)
(C++11)
Garbage soporte colección
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Garbage collection support
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Varios
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Miscellaneous
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addressof
(C++11)
(C++11)
C Library
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C Library
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Definido en la cabecera <memory>
template< class T >
T* addressof(T& arg);
(desde C++11)

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

Contenido

[editar] Parámetros

arg - lvalue object or function

[editar] Valor de retorno

Pointer to arg.

[editar] Excepciones

noexcept specification:  
noexcept
  (desde C++11)

[editar] Posible implementación

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

[editar] Ejemplo

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
}

Salida:

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

[editar] Ver también

the default allocator
(plantilla de clase) [editar]
proporciona información sobre como puntero tipos
Original:
provides information about pointer-like types
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(plantilla de clase) [editar]