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Nested binds
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class ValueAndLog: | |
def __init__(self, value, log): | |
self.value = value | |
self.log = log | |
def __rshift__(self, func): | |
result = func(self.value) | |
return ValueAndLog(result.value, self.log + result.log) | |
@staticmethod | |
def unit(v): | |
return ValueAndLog(v, "") | |
wv3 = ( #wv3 = | |
ValueAndLog.unit(4) >> (lambda v0: # v0 <- ValueAndLog.unit(4) | |
ValueAndLog(v0*v0, "Squared %d\n" % v0) >> (lambda v1: # v1 <- ValueAndLog(v0*v0, ...) | |
ValueAndLog.unit(2*v1) >> (lambda v2: # v2 <- ValueAndLog.unit(2*v1) | |
ValueAndLog(1+v2, "Added 1 to %d\n" % v2) # ValueAndLog(1+v2, ...) | |
) | |
) | |
) | |
) | |
print("Answer:", wv3.value) | |
print("Log:", wv3.log) |
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