Re: unpack hash part of table
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- Subject: Re: unpack hash part of table
- From: 云风 Cloud Wu <cloudwu@...>
- Date: 2022年3月29日 18:12:43 +0800
Spar <developspartv@gmail.com> 于2022年3月29日周二 17:46写道：
>
> What about Lua version of it?
>
> Also lua version of unpack_table. Can be done by pushing all hash values to sequential table and then unpacking it
There is a `unpack_table` version :
static int lunpack_xyzw2(lua_State *L) {
luaL_checktype(L, 1, LUA_TTABLE);
lua_settop(L, 1);
unpack_table(L, 4);
lua_settop(L, 13);
int i;
for (i=0;i<4;i++) {
int idx = i * 2 + 2;
const char * key = lua_tostring(L, idx);
if (key) {
if (strcmp(key, "x") == 0) {
lua_copy(L, idx+1, -4);
} else if (strcmp(key, "y") == 0) {
lua_copy(L, idx+1, -3);
} else if (strcmp(key, "z") == 0) {
lua_copy(L, idx+1, -2);
} else if (strcmp(key, "w") == 0) {
lua_copy(L, idx+1, -1);
}
}
}
return 4;
}
It's not slower (or faster) than getfield version, and I guess we can
optimize it a little more.
--
http://blog.codingnow.com