Re: [proposal] infix function syntax sugar

[HyperHacker <hyperhacker@...>]

2011/12/18 Dimiter "malkia" Stanev <malkia@gmail.com>:
> -- Here is a very poor attempt :)
>
> local function infix(...)
>   local args = {...}
>   local nargs = #args
>   local r = args[1]
>   for k=2,nargs,2 do
>      r = args[k](r, args[k+1])
>   end
>   return r
> end
>
> local function add(a,b)
>   return a + b
> end
>
> print( infix( 12 ,add, 3 ,add, 10 ) )
>
>
>
> On 12/17/11 9:23 PM, Xavier Wang wrote:
>> hi robero and list,
>>
>> i'm inspired by the post about implement c enum. somebody said the
>> getflags function shoud return a userdata to implement a contains
>> function. i think its a good idea, excerpt a details: thus will allocate
>> memory.
>>
>> i'm run lua on a embedded system， embedded systemembedded system, nokia
>> n73 cellphone. my game will lag if i allocate memory in draw function
>> since the garbage collection. so we avoid any memory in event loop. but
>> i really miss the contains function, so i think a syntax allow use
>> function as infix operator will be great.
>>
>> e.g. if i have a function add(a, b), i can call it with a ｀add｀ b, its
>> a syntax sugar of add(a,b)
>>
>> its very simple and can used in many situations, e.g. bitop calls, and
>> flags contains test.
>>
>> has anybody agree me? i hope this feature can appear on lua5.3 :)
>>
>> thanks everybody~
>>
>
>

I had done some hacking of metatables to make the following valid syntax:
foo = (3) '<<' (x)

It's still pretty ugly and not terribly efficient, but it works... :p

-- 
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