Created
June 7, 2012 03:59
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関数合成みたいな何か
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#-*- coding:utf-8 -*- | |
u''' | |
関数合成みたいな何か | |
''' | |
class Composable(object): | |
u''' | |
合成可能 | |
''' | |
def __init__(self, funcs): | |
self.functions = funcs | |
def __and__(self, func): | |
return Composable(self.functions+[func]) | |
def __call__(self, *args, **argd): | |
rev = list(reversed(self.functions)) | |
car = rev[0] | |
cdr = rev[1:] | |
return reduce(lambda x, y: y(x), | |
cdr, car(*args, **argd)) | |
def composable(f): | |
u''' | |
デコレータちゃん | |
''' | |
return Composable([f]) | |
if __name__ == '__main__': | |
@composable | |
def add1(v): | |
return v + 1 | |
@composable | |
def mul2(v): | |
return v * 2 | |
print (mul2 & add1 & add1 & add1)(10) # (10 + 1 + 1 +1) * 2 | |
print (add1 & add1 & add1 & mul2)(10) # 10 * 2 + 1 + 1 + 1 | |
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