PtrCast.h

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//
//
 
#ifndef _INC_PtrCast_H
#define _INC_PtrCast_H
#ifndef NO_PRAGMA_ONCE
#pragma once
#endif
 
#include "cDebugAssert.h"
 
namespace Gray
{
 
#ifdef _CPPRTTI
#define DYNPTR_CAST(t,p)                (dynamic_cast <t*>(p))          // typically used for safer down-casting.
#define IS_TYPE_OF(t,p)                 ((dynamic_cast<const t*>(p))!=nullptr)
#else
#define DYNPTR_CAST(t,p)                (static_cast <t*>(p))   // dynamic_cast isn't available ?
#define IS_TYPE_OF(t,p)                 true    
#endif
 
        template <class _TYPE_TO, class _TYPE_FROM >
        inline bool is_valid_cast(_TYPE_FROM* p)
        {
                // will dynamic_cast work ? AKA IS_TYPE_OF() ? std::is_base_of()
                // TODO typeid(p) == typeid(_TYPE_TO); as dynamic? or IS_TYPE_OF(_TYPE_TO)
                if (p == nullptr)
                        return true;
                _TYPE_TO* p2 = dynamic_cast<_TYPE_TO*>(p);
                return p2 != nullptr ;
        }
 
        template <class _TYPE_TO, class _TYPE_FROM >
        inline _TYPE_TO* check_cast(_TYPE_FROM* p)
        {
#ifdef _DEBUG
                ASSERT(is_valid_cast<_TYPE_TO>(p));
#endif
                return static_cast<_TYPE_TO*>(p);
        };
 
#define CHECKPTR_CAST(t,p)      (::Gray::check_cast<t>(p))
}
 
#endif