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std::make_pair

De cppreference.com
< cpp‎ | utility‎ | pair

 
 
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
initializer_list(C++11)
bitset
hash(C++11)
Operadores relacionales
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Pares y tuplas
Original:
Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Cambiar, hacia adelante y mover
Original:
Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
std::pair
Las funciones miembro
Original:
Member functions
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pair::pair
pair::operator=
pair::swap
Terceros funciones
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Non-member functions
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make_pair
operator=
operator!=
operator<
operator<=
operator>
operator>=
std::swap
get(C++11)
Clases de ayuda
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Helper classes
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tuple_size(C++11)
tuple_element(C++11)
 
Defined in header <utility>
template< class T1, class T2 >

std::pair<T1,T2> make_pair( T1 t, T2 u );
template< class T1, class T2 >

std::pair<V1,V2> make_pair( T1&& t, T2&& u );
(hasta C++11)

(desde C++11)
Crea un objeto std::pair, deducir el tipo de destino de los tipos de argumentos .
Original:
Creates a std::pair object, deducing the target type from the types of arguments.
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Los tipos deducidas son std::decay<T1>::type y std::decay<T2>::type (las transformaciones tipo usual aplicado a argumentos de funciones pasados ​​por valor) a menos que la aplicación de los resultados de std::decay en std::reference_wrapper<X> para algún tipo X, en cuyo caso el tipo es deducida se X&. (desde C++11)
Original:
The deduced types are std::decay<T1>::type and std::decay<T2>::type (the usual type transformations applied to arguments of functions passed by value) unless application of std::decay results in std::reference_wrapper<X> for some type X, in which case the deduced type is is X&. (desde C++11)
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[editar] Parámetros

t, u -
los valores para construir el par de
Original:
the values to construct the pair from
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[editar] Valor de retorno

un objeto std::pair contiene los valores dados .
Original:
an std::pair object containing the given values.
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[editar] Ejemplo

#include <iostream>
#include <utility>
#include <functional>
 
int main()
{
    int n = 1;
    int a[5] = {1,2,3,4,5};
 
    // build a pair from two ints
    auto p1 = std::make_pair(n, a[1]);
    std::cout << "The value of p1 is "
              << "(" << p1.first << ", " << p1.second << ")\n";
 
    // build a pair from a reference to int and an array (decayed to pointer)
    auto p2 = std::make_pair(std::ref(n), a);
    n = 7;
    std::cout << "The value of p2 is "
              << "(" << p2.first << ", " << *(p2.second+1) << ")\n";
}

Output:

The value of p1 is (1, 2)
The value of p2 is (7, 2)