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std::tuple_cat

STD：：元组[医]猫

Defined in header ​​
template< class... Tuples > std::tuple<CTypes...> tuple_cat(Tuples&&... args​(since C++11) (until C++14)
template< class... Tuples > constexpr std::tuple<CTypes...> tuple_cat(Tuples&&... args​(since C++14)

构造一个元组，该元组是args...

参数

args-zero or more tuples to concatenate

返回值

阿std::tuple对象，该对象由所有参数元组的所有元素组成。std::get<i>(std::forward<Ti>(arg))对于每个单独的元素。

例

二次

#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
}

二次

产出：

二次

(10, Test, 3.14, Foo, bar, 10, Test, 3.14, 10)

二次

另见

make_tuplecreates a tuple object of the type defined by the argument types (function template)
tiecreates a tuple of lvalue references or unpacks a tuple into individual objects (function template)
forward_as_tuplecreates a tuple of rvalue references (function template)

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