template<typename F>
struct result_type;

Header

#include <boost/function_types/result_type.hpp>

Extracts the result type of a callable, builtin type.

If F is no callable, builtin type, any attempt to access the type member results in a compile error.

template<typename F, class ClassTransform = add_reference<_> >
struct parameter_types;

Header

#include <boost/function_types/parameter_types.hpp>

Extracts the parameter types of a callable, builtin type.

If F is no callable, builtin type, any attempt to access the sequence results in a compile error.

template<typename F>
struct function_arity;

Header

#include <boost/function_types/function_arity.hpp>

Extracts the function arity, that is the number of parameters. The hidden this of member function pointers counts, in other words the arity value is always greater than or equal to one if F is a member function pointer.

If F is no callable, builtin type, any attempt to access the value results in a compile error.

template<typename T, class ClassTransform = add_reference<_> >
struct components;

Header

#include <boost/function_types/components.hpp>

Extracts all properties of a callable builtin type, that is the result type, followed by the parameter types (including the type of this for member function pointers).

If T is no callable builtin type, the component types are an empty sequence and the Tag's meaning is equivalent to the null_tag.