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

This is the documentation for a snapshot of the develop branch, built from commit 5622cc7dad.


#include <boost/phoenix/core/nothing.hpp>

Finally, the expression::null<mpl::void_>::type does nothing; (a "bum", if you will :-) ). There's a sole expression::null<mpl::void_>::type instance named "nothing". This actor is actually useful in situations where we don't want to do anything. (See for_ Statement for example).