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 2026. The current version is 1.92.0.

Global eps

Global eps

boost::parser::eps

Synopsis

// In header: <boost/parser/parser.hpp>

unspecified eps;

Description

The epsilon parser. This matches anything, and consumes no input. If used with an optional predicate, like eps(pred), it matches iff pred(ctx) evaluates to true, where ctx is the parser context.