How do I pattern match (std::visit) std::pair in C++?

In C++, you can use std::visit to pattern match on a std::pair by wrapping the pair in a std::variant. This allows you to handle different types contained within the pair. Here’s how to do that effectively:

#include <iostream> #include <variant> #include <utility> using namespace std; // Define a variant to hold a pair of different types using PairVariant = variant; void handlePair(const PairVariant& first, const PairVariant& second) { std::visit([](auto&& arg1, auto&& arg2) { cout << "First: " << arg1 << ", Second: " << arg2 << endl; }, first, second); } int main() { pair myPair = { 42, "Hello" }; handlePair(myPair.first, myPair.second); return 0; }

C++ std::visit std::pair std::variant pattern matching

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