Re: unpack hash part of table

[云风 Cloud Wu <cloudwu@...>]

Spar <developspartv@gmail.com> 于2022年3月29日周二 17:27写道：
>
> As universal function to unpack hash-key-values it's great. But this might be useful for specific tables structures like Color. In that case it's better to use getfield directly. This will fulfill consistent and specific use

For the table  { x = 1, y = 2, z = 3, w = 4},
I test the getfield version:

static int lunpack_xyzw(lua_State *L) {
  luaL_checktype(L, 1, LUA_TTABLE);
  lua_getfield(L, 1, "x");
  lua_getfield(L, 1, "y");
  lua_getfield(L, 1, "z");
  lua_getfield(L, 1, "w");
  return 4;
}

`unpack_table` is 2x faster.

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