TUPLE in STL

tuple and pair are very similar in their structure. Just like in pair we can pair two heterogeneous object, in tuple we can pair three heterogeneous objects.

SYNTAX of a tuple is:

// creates tuple of three object of type T1, T2 and T3
tuple<T1, T2, T3> tuple1;  

Tuple Template: Some Commonly used Functions

Similar to pair, tuple template has its own member and non-member functions, few of which are listed below :

• A Constructor to construct a new tuple
• Operator = : to assign value to a tuple
• swap : to swap value of two tuples
• make_tuple() : creates and return a tuple having elements described by the parameter list.
• Operators( == , != , > , < , <= , >= ) : lexicographically compares two pairs.
• Tuple_element : returns the type of tuple element
• Tie : Tie values of a tuple to its refrences.

Program demonstrating Tuple template

#include <iostream>
        
int main ()
{
   tuple<int, int, int> tuple1;   //creates tuple of integers
   tuple<int, string, string> tuple2;    // creates pair of an integer an 2 string
    
   tuple1 = make_tuple(1,2,3);  // insert 1, 2 and 3 to the tuple1
   tuple2 = make_pair(1,"Studytonight", "Loves You");
   /* insert 1, "Studytonight" and "Loves You" in tuple2  */

   int id;
   string first_name, last_name;

   tie(id,first_name,last_name) = tuple2;
   /* ties id, first_name, last_name to 
   first, second and third element of tuple2 */

   cout << id <<" "<< first_name <<" "<< last_name;
   /* prints 1 Studytonight Loves You  */

   return 0;
}