Re: light userdata
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- Subject: Re: light userdata
- From: Adrian Sietsma <adrian_groups@...>
- Date: 2004年7月26日 14:47:06 -0700
I find that lightuserdata is ideal for window handles (in the ms world).
I have a routine that constructs a gui object (tree view) from a lua
table. I then have a seperate lua table indexed by the window handle of
each tree node, as a lightuserdata. This simplifies the c/lua interface
- i can use the c handle to lookup the appropriate lua table object.
--save a window handle
lua_pushlightuserdata(L, hKey);
lua_pushvalue(L,filt); // copy of filter table entry
lua_settable(L, treeindex);
--find data for a window handle
lua_pushstring(L, "__treeitems");
lua_gettable(L, LUA_GLOBALSINDEX);
lua_pushlightuserdata(L, hKey);
lua_gettable(L, -2);
In this case, the handle (lightuserdata) is never accessed by lua
scripts, and so its type is irrelevant. This is a useful way of binding
lua objects to c++ without worrying about pointers and the gc.
Adrian