An STL-compatible hash function object that can be extended to hash user defined types.

Various utilities, such as base-from-member idiom and binary literals in C++03.

Regular expression library.

Intrusive containers and algorithms.

Runtime/Compile time copyable type info.

The Boost Multi-index Containers Library provides a class template named multi_index_container which enables the construction of containers maintaining one or more indices with different sorting and access semantics.