On May 4, 8:11 am, [EMAIL PROTECTED] wrote: > On May 4, 12:21 am, "Gabriel Genellina" <[EMAIL PROTECTED]> > wrote: > > > > > En Sun, 04 May 2008 01:08:34 -0300, Marc 'BlackJack' Rintsch <[EMAIL > > PROTECTED]> escribió: > > > > On Sat, 03 May 2008 16:39:43 -0700, castironpi wrote: > > > >> I'm actually curious if there's a way to write a generator function > > >> (not a generator expression) in C, or what the simplest way to do it > > >> is... besides link the Python run-time. > > > > The reference implementation of Python is written in C, so obviously there > > > must be a way to write something like generators in C. > > > Yes and no. Generators are tied to frames, and frames execute Python code, > > not C. There is no simple way to write generators in C, but there are some > > generator-like examples in the itertools module. > > See this > > threadhttp://groups.google.com/group/comp.lang.python/browse_thread/thread/... > > > -- > > Gabriel Genellina > > Gabriel, > How did your attempt turn out from last May? At first look, it's > outside the scope of Python, but it is not the scope of C > necessarily. Generators offer a lot of simplicity (which I haven't > read about extensively, but am starting to see) that could gain some > reputation for Python. What is the midpoint at which C could meet > Python? > > There is no such thing as a 'frame' per se in C; byte code is > integral. As there is no such thing as suspended state without > frames, and no such thing as generators without suspended state. It's > a hard thing to Google for without knowing the prior terminology for > the work that's already been done on them in C. What work is there? > Are any devs interested in pursuing it? > > The frame implementation. > > http://svn.python.org/projects/python/trunk/Include/frameobject.hhttp://svn.python.org/projects/python/trunk/Objects/frameobject.c > > The generator code. > > http://svn.python.org/projects/python/trunk/Include/genobject.hhttp://svn.python.org/projects/python/trunk/Objects/genobject.c > > I used Microsoft's search engine (python frame generator > site:svn.python.org , links 3 and 5) to find it.
Isn't this guy a bot ? :-) It's learning fast. I believe there is a "frame" in C, composed of its stack and globals. For generators in C, you may look for "coroutines". For example, see: http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html A sample code follows: #define crBegin static int state=0; switch(state) { case 0: #define crReturn(i,x) do { state=i; return x; case i:; } while (0) #define crFinish } int function(void) { static int i; crBegin; for (i = 0; i < 10; i++) crReturn(1, i); crFinish; } The "suspended state" is saved in the static variable. It's not necessary to save the complete "frame", only the suspended state. -- http://mail.python.org/mailman/listinfo/python-list
