Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is an older version of Boost and was released in 2017. The current version is 1.89.0.

Concepts

Concepts

Forward Iterator
Bidirectional Iterator
Random Access Iterator
Associative Iterator
Unbounded Iterator

Fusion iterators are divided into different traversal categories. Forward Iterator is the most basic concept. Bidirectional Iterator is a refinement of Forward Iterator. Random Access Iterator is a refinement of Bidirectional Iterator. Associative Iterator is a refinement of Forward Iterator, Bidirectional Iterator or Random Access Iterator.