Re: [boost] [coroutine] Experimenting with interfaces

Subject: Re: [boost] [coroutine] Experimenting with interfaces
From: Oliver Kowalke (oliver.kowalke_at_[hidden])
Date: 2012-09-21 14:34:00

Am 21.09.2012 20:15, schrieb Eugene Yakubovich:
>>
>> template <typename C>
>> void timer(C c, chrono::seconds interval) {
>>    //  while( interval != chrono::seconds::zero() ) {
>>    //      this_thread::sleep_for(interval);
>>    //      interval = c(interval);
>>    //  }
>>
>> }
>>
>> coroutine<chrono::seconds(chrono::seconds)> c(
>>      [](coroutine<chrono::seconds(chrono::seconds)> c, chrono::seconds i) {
>>          timer(c, i);
>>      }
>> );
>>
>> chrono::seconds s = c(chrono::seconds(1));
>>
>>
>> Which value has variable 's' after return from 'c(chrono::seconds(1))' ?
> chrono::seconds(1) since timer() yields whatever was initially passed
> in and then whatever was returned by c().
>
in the modified example timer() never yields (c(interval) is not called) 
- it simple returns.
no value was transfered from coroutine function to the caller -> 
coroutines must return the type of the signature