[Swift-devel] [Bug 291] New: Add a exists() function to test for file existence

[Justin M Wozniak]

Ok, John, you can give this a try in trunk if you like.  The syntax for 
the built-in is @exists, it takes a string and returns a boolean.
 	Justin

On Sat, 2 Apr 2011, Justin M Wozniak wrote:

>
> I have a prototype of this, I'll get it checked in later today.
> 	Justin
>
> On Fri, 1 Apr 2011, John Dennis wrote:
>
>> Michael,
>>
>> 	This type of function would be great to have.
>> 
>> John
>> On Apr 1, 2011, at 11:51 AM, Michael Wilde wrote:
>> 
>>> Basically as far as I understand: the presence or absence of a particular 
>>> data file within the inout dataset is to be used to determine whether the 
>>> code to process that dataset subsection gets invoked or not:
>>> 
>>> if (exists("extra.data")) {
>>>    DataFile extraInput<"extra.data">;
>>>    extraResult = analyze(extraInput);
>>> }
>>> 
>>> The above is my assumption based on a phone call.  We can and should 
>>> verify the assumption with a simple example.
>>> 
>>> I also thought we can try this today by seeing if extraInput can be an 
>>> array, mapped to zero items if nothing to do and 1 item if something to 
>>> do. That would at least let us test the use case.
>>> 
>>> John, can you verify if the example Swift lines above are what you are 
>>> looking for here?
>>> 
>>> - Mike
>>> 
>>> ----- Original Message -----
>>>> On Fri, 2011-04-01 at 10:51 -0500, Michael Wilde wrote:
>>>> 
>>>>> - we should first verify that exists() will solve the NCAR need in a
>>>>> sufficiently clean way
>>>> 
>>>> I think this is important. Can we get a description of the problem
>>>> instead of a (otherwise) random proposal for a solution?
>>> 
>>> -- 
>>> Michael Wilde
>>> Computation Institute, University of Chicago
>>> Mathematics and Computer Science Division
>>> Argonne National Laboratory
>>> 
>> 
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>
>

-- 
Justin M Wozniak