[erlang-questions] Re: Using match in guards

Zoltan Lajos Kis <>
Tue Dec 22 00:10:33 CET 2009


Sorry, sent it too early :) Wanted to ask for an example where this 
format cannot be used.

Zoltan Lajos Kis wrote:
> search({regex, _} = S) ->
>  ...
>
> Zoltan.
>
> caio ariede wrote:
>> Just correcting my example:
>>
>> search(S) when S = {regex, _} ->
>> ...
>>
>> Caio Ariede
>> http://caioariede.com/
>>
>>
>>
>> On Mon, Dec 21, 2009 at 9:01 PM, caio ariede <> 
>> wrote:
>>  
>>> In function guards we can use functions like is_string/1 and 
>>> is_number/1.
>>>
>>> But I'm needing to check a generic type defined by {type, Value} but
>>> *in guards* like this:
>>>
>>> search(S) when N = {regex, _} ->
>>> ...
>>>
>>> I know that I can do that with search(S = {regex, _}), but my example
>>> was only for representing the problem.
>>>
>>> The main question is: there is a way for using match in guards? Or
>>> something like this?
>>>
>>> Caio Ariede
>>> http://caioariede.com/
>>>
>>>     
>>
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>>
>>   
>
>
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