Method IsValid

libraries/muparser/src/muParserCallback.cpp:839–844

\brief Check that the callback looks valid \throw nothrow Check that the function pointer is not null, and if there are user data that they are not null. */

		and if there are user data that they are not null.
	*/
	bool ParserCallback::IsValid() const
	{
		return GetAddr() != nullptr
			&& !((m_iArgc & CALLBACK_INTERNAL_WITH_USER_DATA)
			     && GetUserData() == nullptr);
	}


	/** \brief Return the callback code. */