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std::tuple_cat

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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>
template< class... Tuples >
tuple<CTypes...> tuple_cat(Tuples&&... args);
(seit C++11)
Erzeugt ein Tupel, das eine Verkettung aller Tupel in args ist .
Original:
Constructs a tuple that is a concatenation of all tuples in args.
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[Bearbeiten] Parameter

args -
null oder mehr Tupel verketten
Original:
zero or more tuples to concatenate
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[Bearbeiten] Rückgabewert

Ein std::tuple Objekt aller Elemente aller Argument Tupeln aus std::get<i>(std::forward<Ti>(arg)) für jedes einzelne Element konstruiert zusammengesetzt .
Original:
A std::tuple object composed of all elements of all argument tuples constructed from std::get<i>(std::forward<Ti>(arg)) for each individual element.
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[Bearbeiten] Beispiel

#include <iostream>
#include <tuple>
#include <string>
 
// helper function to print a tuple of any size
template<class Tuple, std::size_t N>
struct TuplePrinter {
    static void print(const Tuple& t) 
    {
        TuplePrinter<Tuple, N-1>::print(t);
        std::cout << ", " << std::get<N-1>(t);
    }
};
 
template<class Tuple>
struct TuplePrinter<Tuple, 1> {
    static void print(const Tuple& t) 
    {
        std::cout << std::get<0>(t);
    }
};
 
template<class... Args>
void print(const std::tuple<Args...>& t) 
{
    std::cout << "(";
    TuplePrinter<decltype(t), sizeof...(Args)>::print(t);
    std::cout << ")\n";
}
// end helper function
 
int main()
{
    std::tuple<int, std::string, float> t1(10, "Test", 3.14);
    int n = 7;
    auto t2 = std::tuple_cat(t1, std::make_pair("Foo", "bar"), t1, std::tie(n));
    n = 10;
    print(t2);
}

Output:

(10, Test, 3.14, Foo, bar, 10, Test, 3.14, 10)
erzeugt eine tuple Objekt des Typs von den Argumenttypen definiert
Original:
creates a tuple object of the type defined by the argument types
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(Funktions-Template) [edit]
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]
schafft eine tuple der rvalue Referenzen
Original:
creates a tuple of rvalue references
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(Funktions-Template) [edit]