In this C++ tutorial, you will learn how to initialize a tuple with values during declaration or using tuple::make_tuple() function, with example programs.

Initialise a Tuple in C++

There are two ways in which we can initialise a Tuple.

  • Specify the elements of Tuple in the declaration of Tuple.
  • Use make_tuple() function to initialise a tuple variable.

In this tutorial, we will learn how to initialise a tuple using these two methods.

1. Initialise tuple in declaration

To initialise a Tuple during its declaration, provide the elements of Tuple as comma separated values after the tuple name in parenthesis.

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tuple<datatype, datatype> fruit(element1, element2);

In the following program, we initialise a tuple named fruit.

C++ Program

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#include <iostream>
#include<tuple>
using namespace std;

int main() {
    tuple<int, string, bool> fruit(3, "apple", true);

    cout << "Tuple : "
        << get<0>(fruit) << " "
        << get<1>(fruit) << " "
        << get<2>(fruit) << " "
        << endl;
}

Output

Tuple : 3 apple 1 
Program ended with exit code: 0

2. Initialise tuple using make_tuple()

make_tuple() function creates a tuple from given elements.

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make_tuple(element1, element2);

In the following program, we initialise a tuple named fruit using make_tuple() function.

C++ Program

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#include <iostream>
#include<tuple>
using namespace std;

int main() {
    tuple<int, string, bool> fruit;
    fruit = make_tuple(3, "apple", true);
    
    cout << "Tuple : "
        << get<0>(fruit) << " "
        << get<1>(fruit) << " "
        << get<2>(fruit) << " "
        << endl;
}

Output

Tuple : 3 apple 1 
Program ended with exit code: 0

Conclusion

In this C++ Tutorial, we learned how to initialise a Tuple during declaration or using make_tuple() function, with examples.