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Coroutines -- destroy the generator before co_return

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Date: Fri, 19 May 2023 07:16:45 -0700 (PDT)
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Subject: Coroutines -- destroy the generator before co_return
From: cauldwell.thomas@gmail.com (Frederick Virchanza Gotham)
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by: Frederick Virchanza - Fri, 19 May 2023 14:16 UTC

Let's say I have a coroutine that works as a generator.

It gives you the letters of the alphabet:

generator<char> GetAlphabet(void);

So let's say I invoke this coroutine and create a generator object, and I use it to get 'a', and then 'b', and then 'c'.

But let's say I then destroy the generator object before the coroutine has invoked 'co_return'. What's supposed to happen here? Is it simply undefined behaviour, or will it behave as though you had re-entered the coroutine and immediately encountered 'co_return'? (meaning that the destructors of stack objects get invoked properly?)

Subject	Author
Coroutines -- destroy the generator before co_return	Frederick Virchanza Gotham