Ben Cartwright wrote:
> [EMAIL PROTECTED] wrote:
> > Hey, I have the following code that has to send every command it
> > receives to a list of backends.
> <snip>
> > I would like to write each method like:
> >
> > flush = multimethod()
>
> Here's one way, using a metaclass:
Or if you don't mind a more verbose API, you may use a decorator
instead:
# comment out if version<2.5
from functools import wraps
def do_forall(attr):
def deco(func):
f_name = func.__name__
@wraps(func) # comment out if version<2.5
def wrapper(self,*args,**kwds):
for b in getattr(self,attr):
getattr(b,f_name)(*args,**kwds)
return wrapper
return deco
#====== Example =================================
class Foo(object):
def flush(self): print "Foo.flush"
def draw(self, x, y): print "Foo.draw(%s,%s)" % (x,y)
class Bar(object):
def flush(self): print "Bar.flush"
def draw(self, x, y): print "Bar.draw(%s,%s)" % (x,y)
forall_backends = do_forall('backends')
class MultiBackend(object):
"""Renders to multiple backends"""
def __init__(self, backends):
self.backends = backends
@forall_backends
def flush(self):
'Flush all backends'
@forall_backends
def draw(self, x, y):
'Draw point (x,y) on all backends'
m = MultiBackend([Foo(),Bar()])
m.flush()
m.draw(1,2)
#======================================
HTH,
George
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