Re: Use of blocks
Re: Use of blocks
- Subject: Re: Use of blocks
- From: Giannandrea Castaldi <email@hidden>
- Date: Mon, 12 Jul 2010 14:23:20 +0200
On Mon, Jul 12, 2010 at 9:43 AM, vincent habchi <email@hidden> wrote:
> Buongiorno :)
>
> Le 12 juil. 2010 à 09:34, Giannandrea Castaldi a écrit :
>
>> I want to use blocks to extract the min price and the max price from
>> an NSArray of trips. I've found the following way:
>>
>> float minValue = 0.0;
>> [someTrips enumerateObjectsUsingBlock:^(id obj, NSUInteger idx,
>> BOOL *stop) {
>> if (minValue == 0.0 || [[obj adultFinalPrice] floatValue] < minValue) {
>> minValue = [obj floatValue];
>> }
>> }];
>
> […]
>
> Did you test it? Does it work? I've always heard that you could not modify block external variables unless you prefix them with __block. Otherwise the variable is just a const reference.
>
The snippet of code is simplified. In my project minValue and maxValue
are object fields. In these fields I haven't used __block and my tests
give me no error then it seems that for object fields __block doesn't
need. Is it right?
Thanks.
Jean
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