std::tie

 

C++

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Os operadores relacionais Original: Relational operators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>=

Pares e tuplas Original: Pairs and tuples The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

pair

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Troque, avançar e avançar Original: Swap, forward and move The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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std::tuple

Funções de membro Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

tuple::tuple

tuple::operator=

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Não-membros funções Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

make_tuple

tie

forward_as_tuple

None

operator=operator!=operator<operator<=operator>operator>=

std::swap

get

Classes auxiliares Original: Helper classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

tuple_size

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ignore

 

Definido no cabeçalho <tuple>
template<class... Types> tuple<Types&...> tie( Types&... args);		(desde 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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Parâmetros

args

-

zero ou mais argumentos lvalue para construir a tupla Original: zero or more lvalue arguments to construct the tuple from The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valor de retorno

Um objeto que contém std::tuple lvalue referenes.

Original:

A std::tuple object containing lvalue referenes.

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Exceções

noexcept specification:  

noexcept

  (desde C++11)

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.dreturn 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";}

Saída:

Value was inserted sucessfully

make_tuple	cria um objeto tuple do tipo definido pelo tipo de argumento Original: creates a tuple object of the type defined by the argument types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função)
forward_as_tuple	cria um tuple de referências rvalue Original: creates a tuple of rvalue references The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função)
tuple_cat	cria um tuple pela concatenação de qualquer número de tuplas Original: creates a tuple by concatenating any number of tuples The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função)
ignore	espaço reservado para pular um elemento quando descompactar um tuple usando tie Original: placeholder to skip an element when unpacking a tuple using tie The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (constante)