THINK++ — Engineering Visualized

Tuple of Two

STL Pair

A simple container that holds two values of possibly different types. It's often used to return two values from a function or to store key-value associations.

USAGE

#include <utility>
pair<string, int> p = {"Alice", 20};

cout << p.first;  // "Alice"
cout << p.second; // 20

auto p2 = make_pair(10, 3.14);

NESTING

You can nest pairs to store 3 or more values: pair<int, pair<int, int>>.

COMPARISON

Pairs support relational operators (<, >, etc.). They compare the first element, then the second.

DSA USE CASE

Excellent for storing coordinates (x, y), graph edges (weight, node), or entries in a map.

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