INPLAcitvationFile.h

#pragma once

namespace NPL
{
    class INPLRuntimeState;

    /* c++ base activation file that is callable from scripting interface or NPL.
    * @sa NPL_C_Func_ActivationFile and CNPLFile_Stats for example usage:
    *
    * Usage One: we can explicitly register a function by deriving from INPLActivationFile.
    * Usage Two: or we can register automatically by defining static function with special name: NPL_activate_XXXX_cpp, such as :
    *
    * extern "C"{
    *   NPL::NPLReturnCode NPL_activate_script_helloworld_cpp(INPLRuntimeState* pState);
    * }
    * NPL.activate("script/helloworld.cpp", {}) or NPL.activate("script_helloworld.cpp", {}) will both activate it.
    */
    class INPLActivationFile
    {
    public:
        INPLActivationFile() : m_refcount(0) {};
        virtual ~INPLActivationFile(){};

        virtual NPL::NPLReturnCode OnActivate(INPLRuntimeState* pState) = 0;

    public:
        void addref()const
        {
            ++m_refcount;
        }

        bool delref()const
        {
            return --m_refcount <= 0;
        }
        int GetRefCount()const
        {
            return m_refcount;
        }

        //all overridden functions should call this function in order to use the "delete when 
        //reference is zero" scheme
        virtual int Release()
        {
            if (delref()) {
                int nRefCount = GetRefCount();
                delete this;
                return nRefCount;
            }
            return GetRefCount();
        }

    protected:
        mutable int m_refcount;
    };
}