Function Currying

Currying can create a new function by reducing an existing function's argument list.

In Python, currying is done by functools.partial:

from functools import partial

def foo(a,b):
    return a+b

bar = partial(foo, a=1) # equivalent to: foo(a=1, b)
bar(b=10)
#11 = 1+10
bar(a=101, b=10)
#111=101+10

Roughly partial does this:

def partial(func, *part_args):
    def wrapper(*extra_args):
        args = list(part_args)
        args.extend(extra_args)
        return func(*args)

    return wrapper

In C++14:

template<typename Function, typename... Arguments>
auto curry(Function function, Arguments... args) {
    return [=](auto... rest) {
        return function(args..., rest...);
    }; // don't forget semicolumn
}

You can then use it like this:

auto add = [](auto x, auto y) { return x + y; }

// curry 4 into add
auto add4 = curry(add, 4);

add4(6); // 10