Re: C-objects with __gc *and* __index?
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- Subject: Re: C-objects with __gc *and* __index?
- From: Uli Kusterer <witness.of.teachtext@...>
- Date: Sun, 7 Aug 2005 10:34:46 +0200
On Aug 7, 2005, at 6:48:11, Shmuel Zeigerman wrote:
It seems the problems are in the UKAdventureNewRoom
and/or UKAdventureRoomToString. Could you post them?
Sure. Here they are:
//
------------------------------------------------------------------------
-----
// UKAdventureRoomToString:
// Makes sure printing a room says more than just "userdata
xxxx".
//
------------------------------------------------------------------------
-----
int UKAdventureRoomToString( lua_State *pLuaState )
{
UKRoom* self = UKAdventureRoomGetThis( pLuaState );
lua_pushfstring( pLuaState, "Room(%lx)", (unsigned long)self );
return 1;
}
//
------------------------------------------------------------------------
-----
// UKAdventureNewRoom:
// Constructor function for creating new rooms.
//
------------------------------------------------------------------------
-----
int UKAdventureNewRoom( lua_State *pLuaState )
{
UKRoom* * newRoom = (UKRoom* *) lua_newuserdata( pLuaState,
sizeof(UKRoom*) );
// Set a metatable so we can identify objects of this class and
give them metamethods:
luaL_getmetatable( pLuaState, "PACEmaker.Room" );
lua_setmetatable( pLuaState, -2 );
// Actually create a corresponding C++ object:
*newRoom = new UKRoom();
return 1; /* new userdatum is already on the stack */
}
//
------------------------------------------------------------------------
-----
// UKAdventureDeleteRoom:
// Destructor function for disposing of rooms. Called by the
garbage
// collector as needed.
//
------------------------------------------------------------------------
-----
int UKAdventureDeleteRoom( lua_State *pLuaState )
{
UKRoom* theRoom = UKAdventureRoomGetThis( pLuaState );
if( theRoom )
{
delete theRoom;
printf( "Deleted room.\n" );
}
else
printf( "No room to delete.\n" );
return 0;
}
//
------------------------------------------------------------------------
-----
// UKAdventureRoomGetThis:
// Function for getting the "this" parameter for a room
method. If the
// "this" object isn't a room, this throws an error (lua-style
longjmp).
//
------------------------------------------------------------------------
-----
UKRoom * UKAdventureRoomGetThis( lua_State *pLuaState )
{
UKRoom** ud = (UKRoom**) luaL_checkudata( pLuaState, 1,
"PACEmaker.Room" );
luaL_argcheck( pLuaState, ud != NULL, 1, "`Room' expected" );
return (UKRoom *) *ud;
}
Cheers,
-- M. Uli Kusterer
http://www.zathras.de