Lua 5.4 - 'cimport' has no member named 'lua_objlen'

[b4rti]

Hello there.

lib/ziglua/src/lib.zig:1345:17: error: root struct of file 'cimport' has no member named 'lua_objlen'
        return c.lua_objlen(lua.state, index);

Not sure if it's a bug or me being fresh to Lua, but it looks like there was a change in Lua5.2+ and there is no lua_objlen function anymore. Insted there is lua_len, which pushes the result onto the stack.

Lua5.1 Docs

size_t lua_objlen (lua_State *L, int index);
Returns the "length" of the value at the given acceptable index: for strings, this is the string length; for tables, this is the result of the length operator ('#'); for userdata, this is the size of the block of memory allocated for the userdata; for other values, it is 0.

Lua(5.2, 5.3, 5.4) Docs

void lua_len (lua_State *L, int index);
Returns the length of the value at the given index. It is equivalent to the '#' operator in Lua (see §3.4.7) and may trigger a metamethod for the "length" event (see §2.4). The result is pushed on the stack.

[b4rti]

Ahh Ok found it. I probably should call Lua.len in this case. Sorry my bad. Both of this functions are available, but in Lua5.2+ i have to remember to call the right one.

[natecraddock]

Hey! Yep, there are several things that change between versions of Lua.

We recently made a big change (#54) that merged all of the separate Lua language targets into a single lib file. The documentation still needs work though, so sorry for any confusion you might find while we work on that :) Thanks for asking, no need to feel bad!

And as a note, the function in lua 5.2+ that is most similar to lua_objlen is lua_rawlen.