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std::tie

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< cpp‎ | utility‎ | tuple

 
 
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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
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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::tuple
Funções de membro
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Member functions
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tuple::tuple
tuple::operator=
tuple::swap
Não-membros funções
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Non-member functions
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make_tuple
tie
forward_as_tuple
None
operator=
operator!=
operator<
operator<=
operator>
operator>=
std::swap
get
Classes auxiliares
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Helper classes
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tuple_size
tuple_element
uses_allocator
ignore
 
Defined in header <tuple>
template< class... Types >
tuple<Types&...> tie( Types&... args );
(a partir do C++ 11)
Cria uma tupla de referências lvalue aos seus argumentos ou instâncias de std::ignore.
Original:
Creates a tuple of lvalue references to its arguments or instances of std::ignore.
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Índice

[editar] Parâmetros

args -
zero ou mais argumentos lvalue para construir a tupla
Original:
zero or more lvalue arguments to construct the tuple from
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[editar] Valor de retorno

Um objeto que contém std::tuple lvalue referenes.
Original:
A std::tuple object containing lvalue referenes.
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[editar] Exceções

noexcept specification:  
noexcept
  (a partir do C++ 11)

[editar] Exemplo

std::tie pode ser utilizada para introduzir lexicographical comparação a uma estrutura ou a um tuplo descompactar:
Original:
std::tie can be used to introduce lexicographical comparison to a struct or to unpack a tuple:
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#include <iostream>
#include <string>
#include <set>
#include <tuple>
 
struct S {
    int n;
    std::string s;
    float d;
    bool operator<(const S& rhs) const
    {
        // compares n to rhs.n,
        // then s to rhs.s,
        // then d to rhs.d
        return std::tie(n, s, d) < std::tie(rhs.n, rhs.s, rhs.d);
    }
};
 
int main()
{
    std::set<S> set_of_s; // S is LessThanComparable
 
    S value{42, "Test", 3.14};
    std::set<S>::iterator iter;
    bool inserted;
    // unpacks the return value of insert into iter and inserted
    std::tie(iter, inserted) = set_of_s.insert(value);
    if(inserted)
        std::cout << "Value was inserted sucessfully\n";
}

Output:

Value was inserted sucessfully
cria um objeto tuple do tipo definido pelo tipo de argumento
Original:
creates a tuple object of the type defined by the argument types
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(modelo de função) [edit]
cria um tuple de referências rvalue
Original:
creates a tuple of rvalue references
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(modelo de função) [edit]
cria um tuple pela concatenação de qualquer número de tuplas
Original:
creates a tuple by concatenating any number of tuples
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(modelo de função) [edit]
espaço reservado para pular um elemento quando descompactar um tuple usando tie
Original:
placeholder to skip an element when unpacking a tuple using tie
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(constante) [edit]