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std::ignore

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< cpp‎ | utility‎ | tuple

 
 
 
std::tuple
Member-Funktionen
Original:
Member functions
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tuple::tuple
tuple::operator=
tuple::swap
Non-Member-Funktionen
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-Klassen
Original:
Helper classes
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tuple_size
tuple_element
uses_allocator
ignore
 
Defined in header <tuple>
const /*unspecified*/ ignore;
(seit C++11)
Eine Aufgabe der nicht spezifizierten, so dass jeder Wert kann es ohne Wirkung zugeordnet werden. Für die Verwendung mit std::tie beim Auspacken einen std::tuple, als Platzhalter für die Argumente, die nicht verwendet werden .
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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[Bearbeiten] Beispiel

entpacken ein Paar von set.insert () zurückgegeben, sondern nur Speichern der boolesche .
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
schafft eine tuple der lvalue Referenzen oder entpackt ein Tupel in einzelne Objekte
Original:
creates a tuple of lvalue references or unpacks a tuple into individual objects
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(Funktions-Template) [edit]