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Questions - c++-coroutine

Can C++ coroutines contain plain `return` statements?

I am writing a C++ coroutine for a UWP control using C++/WinRT: winrt::fire_and_forget MyControl::DoSomething() { if (/* some condition */) { // Why does this work?! return; ...
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citelao

c++

uwp

c++-winrt

c++-coroutine

cppwinrt

Votes: 0

Answers: 1

Latest Answer

This seems to be a legacy implementation for MSVSC. MSVSC implemented coroutines before the standard was formally complete, so there are two implementations of async (/async and /async:strict). I seem...
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citelao

C++ coroutine's return_void's and return_value's return type

return_void consider the coroutine's ReturnObject below and note the comments before the method ReturnObject::promise_type::return_void : struct ReturnObject { struct promise_type { ...
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ggulgulia

c++

c++20

c++-coroutine

Votes: 0

Answers: 1

Latest Answer

[stmt.return.coroutine]/2 says that the expressions promise_object.return_value(...) and promise_object.return_void() (whichever is used by the co_return) shall be of type void. So the return type o...
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user17732522

Is std::move required to move using co_yield?

Say I have a std::vector that is declared in a loop's body and co_yielded: some_generator<std::vector<int>> vector_sequence() { while (condition()) { std::vector<int> res...
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Bolpat

c++

move

c++20

c++-coroutine

Votes: 0

Answers: 1

Latest Answer

The implicit move rule ([class.copy.elision]/3) applies to return and co_return statements and to throw expressions. It doesn't apply to co_yield. The reason is that, in the contexts enumerated in [cl...
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Brian Bi

Coroutine awaiter methods are called for seemingly not-existing object

In the following program there are two coroutines. coroutine_A is empty and simply calls co_return, and coroutine_B just switches to the first coroutine once by calling co_await. Also the program prin...
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Fedor

c++

c++-coroutine

Votes: 0

Answers: 1

Latest Answer

First, your example exhibit undefined behaviour. Let's look at this: task coroutine_B = [&coroutine_A]() ->task { co_await coroutine_A; }(); coroutine_B.handle.resume(); Your task::promis...
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Serikov

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