Re: Lua as a "domain specific language"?
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- Subject: Re: Lua as a "domain specific language"?
- From: Mark Hamburg <mhamburg@...>
- Date: 2006年3月27日 23:19:30 -0800
on 3/27/06 9:38 AM, Mark Hamburg at mhamburg@adobe.com wrote:
> class "Book" ( ActiveRecord.Base ) do
> belongs_to( 'publisher' )
> has_and_belongs_to_many( 'authors' )
> end
Again, I'll note that this doesn't work because of the change in semantics
for do, but something like this also opens up constructs like:
lock_mutex( mutex ) do
--- do stuff with the mutex locked
end
Which could be written as (untested):
local function pcall2call( success, ... )
if success then
return ...
else
local errmsg = ...
error( errmsg, 0 )
end
end
local function finish_lock_mutex( mutex, success, ... )
mutex:unlock()
return pcall2call( success, ... )
end
function lock_mutex( mutex )
return function( block )
mutex:lock()
return finish_lock_mutex( mutex, pcall( block ) )
end
end
The downside to this is that it generates two closures instead of the one
needed if we use the form:
lock_mutex( mutex, function()
-- do stuff with the locked mutex
end )
Mark