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std::ignore

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< cpp‎ | utility‎ | tuple

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C++
 
Utilità libreria
Tipo di supporto (basic types, RTTI, type traits)
Gestione della memoria dinamica
La gestione degli errori
Programma di utilità
Funzioni variadic
Data e ora
Funzione oggetti
initializer_list(C++11)
bitset
hash(C++11)
Gli operatori relazionali
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Coppie e tuple
Original:
Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Swap, in avanti e spostare
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::tuple
Membri funzioni
Original:
Member functions
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tuple::tuple
tuple::operator=
tuple::swap
Non membri funzioni
Original:
Non-member functions
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make_tuple
tie
forward_as_tuple
None
operator=
operator!=
operator<
operator<=
operator>
operator>=
std::swap
get
Helper classi
Original:
Helper classes
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tuple_size
tuple_element
uses_allocator
ignore
 
Elemento definito nell'header <tuple>
const /*unspecified*/ ignore;
 (dal C++11)
Un oggetto di tipo non specificato in modo tale che qualsiasi valore È possibile assegnare ad essa senza alcun effetto. utilizzare insieme std::tie durante la rimozione di un std::tuple, come segnaposto per gli argomenti che non vengono utilizzati.
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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[modifica] Esempio

decomprimere una coppia restituita da set.insert (), ma solo salvare il boolean .
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";
    }
}

Output: 

Value was inserted sucessfully
crea un tuple di riferimenti lvalue o spacchetta una tupla in singoli oggetti
Original:
creates a tuple of lvalue references or unpacks a tuple into individual objects
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(funzione di modello) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/utility/tuple/ignore&oldid=27242"