Re: A tricky way to determine Lua version

[Ulrich Schmidt <u.sch.zw@...>]

Am 21.05.2016 um 09:13 schrieb Sean Conner:
> It was thus said that the Great Vadim A. Misbakh-Soloviov once stated:
> > >   Mine relies upon strings still having a metatable.
> > But lacks luajit ;)
>
>   Nah.  If version is nil, it's LuaJIT.
>
>   -spc (nil can't be a table key, see ... )

Thats all true. I still like Egors version because it is simple to use.
(without nil tests.) and the results can be changed eg.

function needs_setfenv()
  local f, t = function() return function() end end, {nil,
     [false]  = true,  --'5.1',
     [true]   = false, --'5.2',
     [1/'-0'] = false, --'5.3',
     [1]      = true,  --'JIT'
     }
  return t[1] or t[1/0] or t[f()==f()];
end;


Ulrich