C++ Unpack Tuple Elements into Separate Variables

In this C++ tutorial, you will learn how to unpack a given tuple into a list of variables using tie() function, with example programs.

Unpack Tuple Elements into Separate Variables in C++

tie() function unpacks the elements of a Tuple into variables.

In this tutorial, we will learn how to use tie() function to unpack a given tuple into a list of variables.

Syntax

The syntax of tie() function to unpack tuple x into variables v1, v2, v3, and so on is

tie(v1, v2, v3, .. ) = x

Examples

1. Unpack a three item tuple into three variables

In the following program, we declared a Tuple with three elements. We shall unpack this tuple into three separate variables.

C++ Program

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

int main() {
    tuple<int, string, bool> fruit(3, "apple", true);
    
    int id;
    string name;
    bool isAvailable;
    
    tie(id, name, isAvailable) = fruit;
    
    cout << "id          : " << id << endl;
    cout << "name        : " << name << endl;
    cout << "isAvailable : " << isAvailable << endl;
}

Output

id          : 3
name        : apple
isAvailable : 1
Program ended with exit code: 0

Conclusion

In this C++ Tutorial, we learned how to unpack elements of a tuple into separate variables using tie() function, with the help of example.