Hello Eugene, Am 04.09.2012 01:30, schrieb Eugene Yakubovich:
1. What is the rationale for having the generator-function's return statement be used to return the last generated value or forcing the use of yield_break (which uses exceptions that can be slow). My only experience with generators/coroutines has been in Python which might have biased my view but I think having the generator-function return void would be more natural (and would eliminate the need for yield_break). For example, if I wanted to generate a sequence of evens, I could write:
typedef boost::coro::generator< int > gen_t;
gen_t evens(int cnt) { return [=](gen_t::self_t& self) { for( int i = 0; i < cnt; i++ ) self.yield(i*2); }; } I managed to implement your suggestion - generator-functions are required to return void and generator<>::self_t::yield() accepts the return type specified as template arg of generator<>. generator<>::self_t::yield_break() was removed.
The code is available under git://gitorious.org/boost-dev/boost-dev.git (branch coroutine). regards, Oliver