Tuples

You can create tuples of arbitrary length and types with std::tuple. The class template needs the header <tuple>. std::tuple is a generalization of std::pair. You can convert between tuples with two elements and pairs. The tuple has, like his younger brother std::pair, a default, a copy, and a move constructor. You can swap tuples with the function std::swap.

The i-th element of a tuple t can be referenced by the function template std::get: std::get<i-1>(t). By std::get<type>(t) you can directly refer to the element of the type type.

Tuples support the comparison operators ==, !=, <, >, <= and >=. If you compare two tuples, the elements of the tuples will be compared lexicographically. The comparison starts at index 0.

std::make_tuple

The helper function std::make_tuple is quite convenient for the creation of tuples. You don’t have to provide the types. The compiler automatically deduces them.