Value chaining, a.k.a. continuations

comp4.py

# Add syntactic sugar so that values flow along a "pipeline":
# A >> B >> C
# becomes C(B(A))
#
# To do this in Python we need to wrap the value in its own class

class Value:
    def __init__(self, value):
        self.value = value

    # `value >> func` calls `func(unwrapped-value)`
    def __rshift__(self, other):
        return other(self.value)

def f(x):
    return Value(x*x)

def g(x):
    return Value(2*x)

def h(x):
    return Value(1+x)

result = Value(4) >> f >> g >> h
print(result.value)