[swift-evolution] [Pitch] Introduce user-defined dynamically "callable" types

Wed Nov 15 20:54:31 CST 2017

Without commenting on anything else, I have encountered one use-case where
it would be nice to be able to “call” an instance. And that is, while
modeling some mathematics, I made a DifferentiableFunction type which
stores a function and optionally a reference to another
DifferentiableFunction (its derivative).

I used the subscript notation for “calling” these DifferentiableFunctions,
because that’s what we have available, but it would certainly be nice to
use parentheses rather than square brackets.

Nevin
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