std::addressof
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| Definido no cabeçalho <memory>
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| 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&
Índice |
[editar] Parâmetros
| arg | - | lvalue object or function |
[editar] Valor de retorno
Pointer to arg.
[editar] Exceções
[editar] Possível implementação
template< class T > T* addressof(T& arg) { return (T*)&(char&)arg; } |
[editar] Exemplo
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 }
Saída:
int** overload called with p = 0012FF64 Ptr overload called with p = 0012FF64
[editar] Veja também
| the default allocator (modelo de classe) | |
| (C++11) |
fornece informações sobre como os tipos de ponteiro Original: provides information about pointer-like types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe) |
