What is std::pair?

Question

What is std::pair for, why would I use it, and what benefits does boost::compressed_pair bring?

Answer 1

Additional info: boost::compressed_pair is useful when one of the pair's types is an empty struct. This is often used in template metaprogramming when the pair's types are programmatically inferred from other types. At then end, you usually have some form of "empty struct".

I would prefer std::pair for any "normal" use, unless you are into heavy template metaprogramming.