ksRtti.h

/*
 *  Original author: Paul Varcholik
 *  Additional authors: Shao Voon Wong, Krzysztof Strehlau
 *
 *  This file is a part of the ksIotFramework library.
 *  All licensing information can be found inside LICENSE.md file.
 *
 *  https://github.com/cziter15/ksIotFrameworkLib/blob/master/LICENSE
 */
 
#pragma once
 
#include <cstddef>
 
namespace ksf
{
    class ksRtti
    {
        public:
            virtual ~ksRtti() = default;
 
            virtual const std::size_t getInstanceType() const = 0;
 
            virtual bool isA(const std::size_t id) const
            {
                return false;
            }
 
            template <typename TType>
            TType* as() 
            {
                if (isA(TType::getClassType()))
                    return static_cast<TType*>(this);
 
                return nullptr;
            }
 
            template <typename TType>
            const TType* as() const
            {
                if (isA(TType::getClassType()))
                    return static_cast<const TType*>(this);
 
                return nullptr;
            }
    };
 
    #define KSF_RTTI_DECLARATIONS(_Type, _ParentType)                               \
        public:                                                                     \
            virtual const std::size_t getInstanceType() const                       \
            {                                                                       \
                return _Type::getClassType();                                       \
            }                                                                       \
            static const std::size_t getClassType()                                 \
            {                                                                       \
                static int d{0}; return (std::size_t)&d;                            \
            }                                                                       \
            virtual bool isA(const std::size_t id) const                            \
            {                                                                       \
                if (id == getClassType())                                           \
                    return true;                                                    \
                else                                                                \
                    return _ParentType::isA(id);                                    \
            }                                                                       \
        private:
}