nullptr pointer literal

 

C++

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Los temas generales Original: General topics The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Preprocessor Comentarios Palabras clave	Tabla ASCII Las secuencias de escape Historia de C++
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Los literales Original: Literals The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
literales enteros Los literales de caracteres Los literales de punto flotante literales de cadena	Los literales booleanos nullptr (C++11) definido por el usuario (C++11)
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Montaje en línea

 

Sintaxis

nullptr		(ya que C + +11)

Explicación

El nullptr palabra clave indica el puntero nulo literal. Es un prvalue no especificado de std::nullptr_t tipo. Existen <div class="t-tr-text">conversiones implícitas

Original:

implicit conversions

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de nullptr a puntero nulo valor de cualquier tipo de puntero y cualquier tipo de puntero a miembro. Conversiones similares existen para cualquier valor de std::nullptr_t tipo, así como para la NULL macro, la constante de puntero nulo .

Original:

The keyword nullptr denotes the null pointer literal. It is an unspecified prvalue of type std::nullptr_t. There exist

conversiones implícitas

Original:

implicit conversions

The text has been machine-translated via [http://translate.google.com Google Translate].
You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.

</div> from nullptr to null pointer value of any pointer type and any pointer to member type. Similar conversions exist for any value of type std::nullptr_t as well as for the macro NULL, the null pointer constant.

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Ejemplo

Muestra cómo nullptr permite la transmisión a través de una función de plantilla .

Original:

Demonstrates how nullptr allows forwarding via a template function.

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#include <cstddef>
#include <iostream>
 
template<class F, class A>
void Fwd(F f, A a)
{
    f(a);
}
 
void g(int* i)
{
    std::cout << "Function g called\n";
}
 
int main()
{
    g(NULL);           // Fine
    g(0);              // Fine
 
    Fwd(g, nullptr);   // Fine
//  Fwd(g, NULL);  // ERROR: No function g(int)
}

Output:

Function g called
Function g called
Function g called

Palabras clave

nullptr

Ver también

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)
nullptr_t (C++11)	el tipo de la nullptr literal puntero nulo Original: the type of the null pointer literal nullptr The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (typedef)