Proposal: debug.topointer
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- Subject: Proposal: debug.topointer
- From: Daurnimator <quae@...>
- Date: 2015年7月28日 13:45:10 +1000
In the faraway future, in whatever version of lua comes next:
It'd be nice if lua_topointer was exposed to lua code.
This would allow for users to get a unique value corresponding to a
given object.
Use cases:
- __tostring metamethods that have previously needed a `rawtostring`
(usually painstakingly created by removing the metatable and
then replacing it)
- common value for comparison by e.g. table.sort
Proposed implementation:
static int db_topointer (lua_State *L) {
luaL_checkany(L, 1);
void *p = lua_topointer(L, 1);
if (p == NULL)
lua_pushnil(L);
else
lua_pushlightuserdata(L, p);
return 1;
}