Context.h

/*
 * Copyright (C) 2020-2026 by Marc Boris Duerner
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * As a special exception, you may use this file as part of a free
 * software library without restriction. Specifically, if other files
 * instantiate templates or use macros or inline functions from this
 * file, or you compile this file and link it with other files to
 * produce an executable, this file does not by itself cause the
 * resulting executable to be covered by the GNU General Public
 * License. This exception does not however invalidate any other
 * reasons why the executable file might be covered by the GNU Library
 * General Public License.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301 USA
 */
 
#ifndef PT_LUA_CONTEXT_H
#define PT_LUA_CONTEXT_H
 
#include <Pt/Lua/Api.h>
#include <Pt/Lua/AsyncCall.h>
#include <Pt/Reflex/TypeManager.h>
#include <Pt/Any.h>
 
#include <string>
#include <vector>
 
struct lua_State;
 
namespace Pt {
 
namespace Lua {
 
class PT_LUA_API Context
{
  public:
    explicit Context(Pt::Reflex::TypeManager& tm);
 
    ~Context();
 
    lua_State* state() const
    { return _L; }
 
    Pt::Reflex::TypeManager& typeManager()
    { return _tm; }
 
    void reset();
 
  private:
    Context(const Context&);
    Context& operator=(const Context&);
 
    void bindType(Pt::Reflex::Type& type);
 
  private:
    Pt::Reflex::TypeManager&  _tm;
    struct lua_State* _L;
    // Snapshot of global keys present after bindType() calls, used by reset().
    std::vector<std::string> _bindingKeys;
};
 
struct LuaObjectHeader
{
  void*             instance;
  Pt::Reflex::Type* type;
};
 
static const std::size_t LUAOBJECT_DATA_OFFSET =
  (sizeof(LuaObjectHeader) + sizeof(void*) - 1) & ~(sizeof(void*) - 1);
 
} // namespace
 
} // namespace
 
#endif // include guard