On 12 juil. 2010, at 14:23, Giannandrea Castaldi wrote:
> On Mon, Jul 12, 2010 at 9:43 AM, vincent habchi <vi...@macports.org> 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?
Yes. Instance variables are modified via self.
Thomas
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