Re: Autolocals?
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- Subject: Re: Autolocals?
- From: "Alexander Gladysh" <agladysh@...>
- Date: 2008年3月24日 13:49:29 +0300
> > When used frequently, however, it can be a performance win since it
> > eliminates a table lookup. I've started to use the convention:
> >
> > local Corge_foo = Corge.foo
>
> > 1. I prefer to avoid using require.
> > 2. There is no validation for Corge.foo to actually exist.
>
> <...>
>
> If you prefer, the "key not exist" function could be defined
> apart from the module:
>
> local Corge_foo = import(Corge, 'foo') -- or
> local Corge_foo = checked(Corge).foo
My import() function does check for the key existance. What I meant in
the original post is that there is no protection from messing up order
of existant key:
local foo, bar, baz = import 'path/to/file.lua' { 'bar', 'baz', 'foo' }
If you write it separately, well, yes, it would arguably be somewhat
easier to spot while reading code, but at price of greater code bloat:
local file = import 'path/to/file.lua' -- Okay, set metatable there
local foo = file.foo
local bar = file.bar
local baz = file.baz
As soon as you fold it in single line for compactness, all benefits vanish:
local file = import 'path/to/file.lua'
local foo, bar, baz = file.foo, file.baz, file.baz
Alexander.