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2008/4/7, Abhinav Lele <>:
> I registered a C function in Lua using
>  lua_pushstring("fn");
>  lua_pushcfunction(fn);
>  lua_settable(L,LUA_GLOBALSINDEX);
>  how i can do the reverse , i.e. remove the function from lua environment

Just set the variable to nil. The closure will eventually get collected.

lua_pushstring(L, "fn");
lua_settable(L, LUA_GLOBALSINDEX);

Note that there are several functions in the Lua API to ease
manipulation of tables. The above could be rewritten in a shorter form
as :

lua_setfield(L, LUA_GLOBALSINDEX, "fn");

or even shorter:

lua_setglobal(L, "fn");