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std::ignore

De cppreference.com
< cpp‎ | utility‎ | tuple

 
 
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
Original:
Relational operators
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Pares y tuplas
Original:
Pairs and tuples
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(C++11)
Cambiar, hacia adelante y mover
Original:
Swap, forward and move
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(C++11)
(C++11)
(C++11)
 
std::tuple
Las funciones miembro
Original:
Member functions
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Terceros funciones
Original:
Non-member functions
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Clases de ayuda
Original:
Helper classes
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ignore
 
Definido en la cabecera <tuple>
const /*unspecified*/ ignore;
(desde C++11)
Un objeto de tipo no especificado de manera que cualquier valor pueden ser asignados a ella sin efecto. Diseñado para usarse con std::tie al desempaquetar un std::tuple, como un marcador de posición para los argumentos que no se usan .
Original:
An object of unspecified type such that any value can be assigned to it with no effect. Intended for use with std::tie when unpacking a std::tuple, as a placeholder for the arguments that are not used.
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[editar] Ejemplo

desempaquetar un par devuelto por set.insert (), pero sólo se ahorra el booleano .
Original:
unpack a pair returned by set.insert(), but only save the boolean.
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#include <iostream>
#include <string>
#include <set>
#include <tuple>
 
int main()
{
    std::set<std::string> set_of_str;
    bool inserted;
    std::tie(std::ignore, inserted) = set_of_str.insert("Test");
    if (inserted) {
        std::cout << "Value was inserted sucessfully\n";
    }
}

Salida:

Value was inserted sucessfully
crea una tuple de referencias lvalue o desempaqueta una tupla en objetos individuales
Original:
creates a tuple of lvalue references or unpacks a tuple into individual objects
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(plantilla de función) [editar]