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class Proc
def ===(*args)
call(*args)
end
def yield(*args)
call(*args)
end
def to_proc
self
end
def curry(arity=self.arity)
type = :proc
abs = lambda {|a| a < 0 ? -a - 1 : a}
arity = abs[arity]
if lambda?
type = :lambda
self_arity = self.arity
if (self_arity >= 0 && arity != self_arity) ||
(self_arity < 0 && abs[self_arity] > arity)
raise ArgumentError, "wrong number of arguments (#{arity} for #{abs[self_arity]})"
end
end
pproc = self
make_curry = proc do |given_args=[]|
send(type) do |*args|
new_args = given_args + args
if new_args.size >= arity
pproc[*new_args]
else
make_curry[new_args]
end
end
end
make_curry.call
end
end
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