C++ Tuple Library - tuple_cat

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Description

It constructs an object of the appropriate tuple type to contain a concatenation of the elements of all the tuples in tpls, in the same order.

Declaration

Following is the declaration for std::tuple_cat.

C++98

	
template <class... Tuples>
   tuple<CTypes...> tuple_cat (Tuples&&... tpls);

C++11

template <class... Tuples>
   tuple<CTypes...> tuple_cat (Tuples&&... tpls);

C++14

template <class... Tuples>
   tuple<CTypes...> tuple_cat (Tuples&&... tpls);

Parameters

tpls − It separats list of tuple objects. These may be of different types.

Return Value

It returns a tuple object of the appropriate type to hold args.

Exceptions

No-throw guarantee − this member function never throws exceptions.

Data races

None introduced by this call.

Example

In below example for std::tuple_cat.

#include <iostream>
#include <utility>
#include <string>
#include <tuple>

int main () {

   std::tuple<float,std::string> mytuple (3.14,"pi");
   std::pair<int,char> mypair (100,'x');

   auto myauto = std::tuple_cat ( mytuple, std::tuple<int,char>(mypair) );

   std::cout << "myauto contains: " << '\n';
   std::cout << std::get<0>(myauto) << '\n';
   std::cout << std::get<1>(myauto) << '\n';
   std::cout << std::get<2>(myauto) << '\n';
   std::cout << std::get<3>(myauto) << '\n';

   return 0;
}

The output should be like this −

myauto contains: 
3.14
pi
100
x