RegistryRef.h

Go to the documentation of this file.

// RegistryRef.h
//
// Copyright (c) 2014, 2016 Michael Imamura.
//
// Licensed under GrokkSoft HoverRace SourceCode License v1.0(the "License");
// you may not use this file except in compliance with the License.
//
// A copy of the license should have been attached to the package from which
// you have taken this file. If you can not find the license you can not use
// this file.
//
//
// The author makes no representations about the suitability of
// this software for any purpose.  It is provided "as is" "AS IS",
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied.
//
// See the License for the specific language governing permissions
// and limitations under the License.

#pragma once

#if defined(_WIN32) && defined(HR_ENGINE_SHARED)
#   ifdef MR_ENGINE
#       define MR_DllDeclare   __declspec( dllexport )
#   else
#       define MR_DllDeclare   __declspec( dllimport )
#   endif
#else
#   define MR_DllDeclare
#endif

namespace HoverRace {
    namespace Script {
        class Core;
    }
}

namespace HoverRace {
namespace Script {

class MR_DllDeclare RegistryRef
{
public:
    constexpr RegistryRef(Core &scripting) noexcept :
        scripting(&scripting), ref(LUA_NOREF) { }
    RegistryRef(const RegistryRef &o) noexcept;
    RegistryRef(RegistryRef &&o) noexcept :
        scripting(o.scripting), ref(o.ref)
    {
        o.ref = LUA_NOREF;
    }

    ~RegistryRef()
    {
        Clear();
    }

    RegistryRef &operator=(const RegistryRef &o) noexcept;
    RegistryRef &operator=(RegistryRef &&o) noexcept
    {
        scripting = o.scripting;
        ref = o.ref;
        o.ref = LUA_NOREF;
        return *this;
    }

    RegistryRef &operator=(const luabind::object &obj)
    {
        Set(obj);
        return *this;
    }

    operator bool() const noexcept
    {
        return ref != LUA_NOREF && ref != LUA_REFNIL;
    }

public:
    Core &GetScripting() const noexcept { return *scripting; }

public:
    void Clear() noexcept;

    void SetFromStack() noexcept;
    void Set(const luabind::object &obj);

    void Push() const noexcept;

private:
    Core *scripting;
    int ref;
};

}  // namespace Script
}  // namespace HoverRace

#undef MR_DllDeclare