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

Function template visitor_ptr

boost::visitor_ptr —

Returns a visitor object that adapts function pointers for use as a static visitor.

template<typename R, typename T> visitor_ptr_t<T,R> visitor_ptr(R (*)(T));

Constructs and returns a visitor_ptr_t adaptor over the given function.

Returns:	Returns a `visitor_ptr_t` visitor object that, when applied, invokes the given function.
Throws:	Will not throw. (Note, however, that the returned visitor object may throw when applied.)