Re: void* in Lua_State for Application?
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- Subject: Re: void* in Lua_State for Application?
- From: Philipp Janda <siffiejoe@...>
- Date: 2013年9月01日 18:57:57 +0200
Am 01.09.2013 18:32 schröbte Jo-Philipp Wich:
What about using container_of() [1] ?
struct LuaPrivateState {
lua_State *pVM;
void *extra_data;
struct foobar baz;
};
This is basically what Mikhail proposed, but it will only work if the
lua_State is included in LuaPrivateState by value and not by pointer
(and lua_State is an incomplete type, private to `lstate.c`, so you
can't include it by value).
There already is a LuaPrivateState equivalent in lstate.c:
typedef struct LX {
#if defined(LUAI_EXTRASPACE)
char buff[LUAI_EXTRASPACE];
#endif
lua_State l;
} LX;
exactly for this purpose, but it is not accessible outside of `lstate.c`.
And in a function that gets a pointer to the lua_State, do:
int whatever(lua_State *L, ...)
{
struct LuaPrivateState *state =
container_of(L, struct LuaPrivateState, pVM);
...
}
1: http://www.kroah.com/log/linux/container_of.html
~ Jow
Philipp