P4::ICastable Class Reference

#include <castable.h>

Inheritance diagram for P4::ICastable:

Public Member Functions
template<typename T >
T &	as ()
	Tries to convert the class to type T. A BUG occurs if the cast fails.
template<typename T >
const T &	as () const
	Tries to convert the class to type T. A BUG occurs if the cast fails.
template<typename T >
T *	checkedTo ()
	Performs a checked cast. A BUG occurs if the cast fails.
template<typename T >
const T *	checkedTo () const
	Performs a checked cast. A BUG occurs if the cast fails.
Public Member Functions inherited from P4::RTTI::Base
template<typename T >
bool	is () const noexcept
virtual bool	isA (TypeId typeId) const noexcept=0
template<typename T >
const T *	to () const noexcept
	Same as to, but returns const pointer to T.
template<typename T >
T *	to () noexcept
virtual TypeId	typeId () const noexcept=0

Additional Inherited Members
Protected Member Functions inherited from P4::RTTI::Base
virtual const void *	toImpl (TypeId typeId) const noexcept=0

Detailed Description

Handy type conversion methods that can be inherited by various base classes. In order to use ICastable one also need to provide intrusive lightweight RTTI metadata for the given class hierarchy. See docs/C++.md for more information, but in short, one need to use DECLARE_TYPEINFO() macro for this. There is no DECLARE_TYPEINFO for ICastable itself as we are not expecting pointers neither to ICastable nor to RTTI::Base to appear within the codebase. As the same time, one should not cast to ICastable as well (via e.g. ->to<ICastable>(). Use DECLARE_TYPEINFO without bases to specify the base class for a given herarchy.