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// ---------------------------------------------------------------------------
// FILE NAME : LuaThis.h
// ---------------------------------------------------------------------------
// DESCRIPTION :
//
// Controls the "this" table
//
// ---------------------------------------------------------------------------
// VERSION : 1.01
// DATE : 1-Sep-2005
// AUTHOR : Richard Shephard
// ---------------------------------------------------------------------------
// LIBRARY INCLUDE FILES
#ifndef __LUA_THIS_H__
#define __LUA_THIS_H__
#include "luainc.h"
#include "luavirtualmachine.h"
// Sets the "this" global table that scripts use
class CLuaThis
{
public:
CLuaThis (CLuaVirtualMachine& vm, int iRef) : m_iOldRef (0), m_vm (vm)
{
lua_State *state = (lua_State *) vm;
if (vm.Ok ())
{
// Save the old "this" table
lua_getglobal (state, "this");
m_iOldRef = luaL_ref (state, LUA_REGISTRYINDEX);
// replace it with our new one
lua_rawgeti(state, LUA_REGISTRYINDEX, iRef);
lua_setglobal (state, "this");
}
}
virtual ~CLuaThis (void)
{
lua_State *state = (lua_State *) m_vm;
if (m_iOldRef > 0 && m_vm.Ok ())
{
// Replace the old "this" table
lua_rawgeti(state, LUA_REGISTRYINDEX, m_iOldRef);
lua_setglobal (state, "this");
luaL_unref (state, LUA_REGISTRYINDEX, m_iOldRef);
}
}
protected:
int m_iOldRef;
CLuaVirtualMachine& m_vm;
};
#endif // __LUA_THIS_H__
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