Bidirectional maps library for C++. With Boost.Bimap you can create associative containers in which both types can be used as key.
The Boost.Geometry library provides geometric algorithms, primitives and spatial index.
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.
A value-semantic, type-safe wrapper for representing 'optional' (or 'nullable') objects of a given type. An optional object may or may not contain a value of the underlying type.
Containers for storing heap-allocated polymorphic objects to ease OO-programming.
Voronoi diagram construction and booleans/clipping, resizing/offsetting and more for planar polygons with integral coordinates.