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std::tuple_cat

Материал из cppreference.com

 
 
 
std::tuple
Член функций
Original:
Member functions
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tuple::tuple
tuple::operator=
tuple::swap
Не являющиеся членами функций
Original:
Non-member functions
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make_tuple
tie
forward_as_tuple
None
operator=
operator!=
operator<
operator<=
operator>
operator>=
std::swap
get
Вспомогательные классы
Original:
Helper classes
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tuple_size
tuple_element
uses_allocator
ignore
 
Заголовочный файл <tuple>
template< class... Tuples >
tuple<CTypes...> tuple_cat(Tuples&&... args);
(начиная с C++11)
Создает кортеж, который представляет собой объединение всех наборов из args.
Original:
Constructs a tuple that is a concatenation of all tuples in args.
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[править] Параметры

args -
ноль или более кортежей для сцепления
Original:
zero or more tuples to concatenate
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[править] Возвращаемое значение

std::tuple объект, состоящий из всех элементов всех аргументов кортежей построен из std::get<i>(std::forward<Ti>(arg)) для каждого отдельного элемента.
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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[править] Пример

#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);
}

Вывод:

(10, Test, 3.14, Foo, bar, 10, Test, 3.14, 10)
tuple создает объект типа определяются типы аргументов
Original:
creates a tuple object of the type defined by the argument types
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(шаблон функции) [edit]
создает tuple ссылок именующее или распаковывает кортеж на отдельные объекты
Original:
creates a tuple of lvalue references or unpacks a tuple into individual objects
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(шаблон функции) [edit]
создает tuple из RValue ссылки
Original:
creates a tuple of rvalue references
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(шаблон функции) [edit]