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#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
/* push metatable to stack, create if not yet reg, the metatable of the table is its self */
int lua_opentablemt(lua_State *L, const char * libname, const luaL_reg * reg, int upval){
/*STACK:...<upvals>#*/
if(luaL_newmetatable(L, libname)){
/*STACK:...<upvals><tablemt>#*/
luaL_openlib(L, NULL, reg, upval);
lua_pushliteral(L, "__index");
/*STACK:...<tablemt><"__index">#*/
lua_pushvalue(L, -2);
/*STACK:...<tablemt><"__index"><tablemt>#*/
lua_rawset(L, -3);
/*STACK:...<tablemt>*/
return 1;//created
}
return 0;//opened, all ready created
}
/* new user data with metamethods table */
void * lua_newuserdatamt(lua_State *L, size_t cdata, const char * mtname, const luaL_reg * mtreg){
void* pdata = lua_newuserdata(L, cdata);/*STACK:...<udata># */
lua_opentablemt(L, mtname, mtreg, 0); /*STACK:...<udata><tablemt># */
lua_setmetatable(L, -2); /*STACK:...<udata># */
return pdata;
}
/* new user data with metamethods table and upvalues */
void * lua_newuserdatamtuv(lua_State *L, size_t cdata, const char * mtname, const luaL_reg * mtreg, int upval){
void* pdata;
/*STACK:...<upvals>#*/
lua_opentablemt(L, mtname, mtreg, upval);
/*STACK:...<tablemt>#*/
pdata = lua_newuserdata(L, cdata);
/*STACK:...<tablemt><udata>#*/
lua_insert(L,-2);
/*STACK:...<udata><tablemt>#*/
lua_setmetatable(L, -2);
/*STACK:...<udata>#*/
return pdata;
}
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