A struct pair is a heterogeneous pair of values. Its data members are first and second.
#include <pair>
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Introduces a pair.
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Employee irene("Irene", "Eneri"); Employee leo("Leonard", "Eneri"); typedef int Social_security_number; pair<Social_security_number, Employee> p1(7812, irene), p2(5555, leo); assert( p1.first == 7812 ); assert( p2.second == leo );