On Thu, Jul 19, 2018 at 10:02 AM, Eric Fahlgren <ericfahlg...@gmail.com> wrote:
> On Thu, Jul 19, 2018 at 6:52 AM Michael Hall <python-id...@michaelhall.tech> > wrote: > >> While I am aware of projects like Cython and mypy, it seems to make sense >> for CPython to allow optional enforcement of type hints, with compiler >> optimizations related to it to be used. While this would not receive the >> same level of performance benefits as using ctypes directly, there do >> appear to be various gains available here. >> > > Just to make sure I understand: In other words, they would no longer be > "hints" but "guarantees". This would allow an optimizer pass much greater > latitude in code generation, somehow or other. > > For purposes of illustration (this is not a proposal, just for > clarification): > > @guaranteed_types > def my_sqrt(x:c_double) -> c_double: > ... > > would tell the compiler that it's now possible to replace the general > PyObject marshalling of this function with a pure-C one that only accepts > doubles and woe be unto those who use it otherwise. > > Yes, Though this would likely require introducing new grammar of some sort to have it treated by the compiler as a guarantee, rather than a hint.
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