Notes

Bundle a fixed number of values of possibly-different types together, without writing a whole struct for it.

std::pair<std::string, int> entry = {"Alice", 100};
entry.first;    // "Alice"
entry.second;   // 100

std::tuple<std::string, int, bool> record = {"Bob", 42, true};
std::get<0>(record);   // "Bob"
std::get<2>(record);   // true

pair is exactly two elements, accessed by .first/.second. tuple is any number, accessed by index via std::get<N>.

Structured bindings — unpack them readably

auto [name, score] = entry;   // name = "Alice", score = 100

Much more readable than .first/.second or std::get<0> scattered through the code. Works with pair, tuple, arrays, and any struct with public members.

Related

using type alias