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std::make_pair

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< cpp‎ | utility‎ | pair

 
 
Biblioteca de utilitários
Digite apoio (basic types, RTTI, type traits)
Gerenciamento de memória dinâmica
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Utilidades do programa
Variadic funções
Data e hora
Objetos de função
initializer_list(C++11)
bitset
hash(C++11)
Os operadores relacionais
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Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Pares e tuplas
Original:
Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Troque, avançar e avançar
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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
Funções de membro
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Member functions
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pair::pair
pair::operator=
pair::swap
Não-membros funções
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Non-member functions
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make_pair
operator=
operator!=
operator<
operator<=
operator>
operator>=
std::swap
get(C++11)
Classes auxiliares
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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 );
(até C + 11)

(a partir do C++ 11)
Cria um objeto std::pair, deduzindo o tipo de destino a partir dos tipos de argumentos.
Original:
Creates a std::pair object, deducing the target type from the types of arguments.
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Os tipos deduzidas são std::decay<T1>::type e std::decay<T2>::type (as transformações do tipo habitual aplicada a argumentos de funções passados ​​por valor), a menos que a aplicação dos resultados std::decay em std::reference_wrapper<X> por algum tipo X, caso em que o tipo é deduzida é X&. (a partir do 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&. (a partir do C++ 11)
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[editar] Parâmetros

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

um objeto std::pair contendo os valores indicados.
Original:
an std::pair object containing the given values.
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[editar] Exemplo

#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)