std::nullptr_t

 

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Defined in header <cstddef>
typedef decltype(nullptr) nullptr_t;		(ya que C + +11)

std::nullptr_t es el tipo de puntero nulo literal, nullptr .

Original:

std::nullptr_t is the type of the null pointer literal, nullptr.

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Ejemplo

Si dos o más sobrecargas aceptan diferentes tipos de puntero, una sobrecarga para std::nullptr_t es necesario aceptar un argumento puntero nulo .

Original:

If two or more overloads accept different pointer types, an overload for std::nullptr_t is necessary to accept a null pointer argument.

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#include <cstddef>
#include <iostream>
 
void f(int* pi)
{
   std::cout << "Pointer to integer overload\n";
}
 
void f(double* pd)
{
   std::cout << "Pointer to double overload\n";
}
 
void f(std::nullptr_t nullp)
{
   std::cout << "null pointer overload\n";
}
 
int main()
{
    int* pi; double* pd;
 
    f(pi);
    f(pd);
    f(nullptr);  // would be ambiguous without void f(nullptr_t)
    // f(NULL);  // ambiguous overload: all three functions are candidates
}

Output:

Pointer to integer overload
Pointer to double overload
null pointer overload

Ver también

nullptr	el puntero literal que especifica un puntero (C++11) valor nulo Original: the pointer literal which specifies a null pointer value (C++11) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
NULL	definido por la implantación de puntero nulo constante Original: implementation-defined null pointer constant The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (macro constante)