VS2019 latest c++ compiler. Error is :"a coroutine's promise must declare either 'return_value' or 'return_void'" Example pulled from David Mazièreshttps://www.scs.stanford.edu/~dm/blog/c...

I have installed gcc-10 compiler on my ubuntu 20.04. I needed to test the work of coroutine ts, so I found an example using coroutines and tried to compile it. exemple: #include <coroutine> #...

The GCC C++ compiler (any many other C++ compilers as well) provide nonstandard extentions such as alloca() for stack based allocation variable length arrays, as they are part of the C standard C...

I'm fairly new to C++ coroutines. When my app shuts down, I'd like to be able to give any outstanding co-routines a hint that I'd prefer they finished early. One solution/idea I came up with was to...

With the new C++ coroutines, is it possible to define a coroutine class that I can use to yield from functions without returning a value? Or does yield always have to return something? I'm just int...

I'm performing some experimentation on C++20 having in mind their potential usage in embedded application. However I noticed that both GCC and Clang generates frames that are bigger than the ones t...

In Rust, asynchronous functions do not require allocating on the heap. Function async returns a compiler-generated structure on which you call a compiler generated poll method. The design of async ...

I am working with C++20 coroutines, specifically simple generators, but I have observed similar results with coroutines replacing state machines based on boost::msm. Actually my goal is to provide ...

I have a specific use case: In my library, concurrencpp, I want to implement the function make_exceptional_lazy_result which is basically like the C# method Task.FromException. Inside the implement...

When using C++20 coroutines with Boost.Asio it is possible to make an operation awaitable with either boost::asio::use_awaitable or boost::asio::deferred as in the following examples. std::size_t n...

I was tracking down a bug in gcc and encountered a situation for which I don't know what the acceptable behavior(s) are. Suppose we have, somewhere within a coroutine, a line such as: Pair{.x{}, .y...

Preamble This is a description of what I am trying to do with the code, skip to the next section to see the actual issue. I want to use coroutines in an embedded system, where I can't afford too ma...

From the well-known C++ coroutine library (search "Don't allow any use of co_await inside the generator coroutine." in the source file generator.hpp), and from my own experiments, I know ...

This question is not about coroutines in C++20 but coroutines in general. I'm learning C++20 coroutines these days. I've learnt about stackful and stackless coroutines from Coroutines Introduction....

I want to warp a typical C callback API that generates multiple int values into an iterable in the fashion of std::generator<int> (see p2502r1). API looks like: typedef void (*Callback)(int);...

Since the std::generator is making it into CPP23, I am playing around with MSVC's incomplete version. However, I notice that it seems lose exactly one yield when used with std::views::take. Here is...

It's common knowledge that returning a pointer to a stack variable is generally a bad idea: int* foo() { int i = 0; return &i; } int main() { int* p = foo(); } In the example above, my und...

In the following example, NRVO (Named Return Value Optimization) applies as per this article: std::string f1() { std::string str; return str; // NVRO applies here! } However, consider: task&...

The first restriction on coroutines specified in cpp reference page is that coroutines cannot use variadic arguments. But when I try to use a coroutine that accepts varidaic arguments in its parame...

I have read this question and tried to replicate the answer with the following code: #include <iostream> #include <syncstream> #include <thread> #include <coroutine> #includ...

I'd like to make a function with both sync and coroutine version, without using template specialization, i.e. with an if constexpr. This is the function I wrote: template <Async _a> AsyncResu...

I am exploring and trying to learn C++ Coroutines (added in C++20). An SDK I am using has asynchronous API calls which all take a callback, the callbacks are invoked on some background thread manag...

As a novice C++ programmer who is very new to the concept of coroutines, I am trying to study and utilize the feature. Although there is explanation of coroutine here: What is a coroutine? I ...

In C++ coroutines, awaiters-types (i. e. argument-types of co_await and return types of initial_suspend/final_suspend) require the three methods await_ready(), await_suspend(std::coroutine_handle&l...

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; } co_await winrt...