C++ Tuple Library - (constructor)

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Description

It constructs a tuple object and involves individually constructing its elements, with an initialization that depends on the constructor form invoked.

Declaration

Following is the declaration for std::tuple::tuple.

C++98

	
constexpr tuple();

C++11

constexpr tuple();

Parameters

default constructor is a tuple object with its elements value-initialized.

Return Value

none

Exceptions

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

Data races

The elements of tpl and pr are accessed.

Example

In below example for std::tuple::tuple.

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

int main () {
   std::tuple<int,char> first;
   std::tuple<int,char> second (first);
   std::tuple<int,char> third (std::make_tuple(20,'b'));
   std::tuple<long,char> fourth (third);
   std::tuple<int,char> fifth (10,'a');
   std::tuple<int,char> sixth (std::make_pair(30,'c'));

   std::cout << "fourth contains: " << std::get<0>(sixth);
   std::cout << " and " << std::get<1>(fourth) << '\n';

   return 0;
}

The output should be like this −

fourth contains: 30 and b