Coroutines – A Deep Dive -- Quasar Chunawala
Coroutines are powerful but require some boilerplate code. Quasar Chunawala explains what you need to implement to get coroutines working.
Coroutines – A Deep Dive
by Quasar Chunawala
From the article:
The following code is the simplest implementation of a coroutine:
#include <coroutine> void coro_func(){ co_return; } int main(){ coro_func(); }Our first coroutine will just return nothing. It will not do anything else. Sadly, the preceding code is too simple for a functional coroutine and it will not compile. When compiling with gcc 15.2, we get the error shown in Figure 1.
<source>: In function 'void coro_func()': <source>:4:5: error: unable to find the promise type for this coroutine 4 | co_return; | ^~~~~~~~~Figure 1 Looking at C++ reference, we see that the return type of a coroutine must define a type named
promise_type.
Memory-safety vulnerabilities remain one of the most persistent and costly risks in large-scale C++ systems, even in well-tested production code. This article explores how hardening the C++ Standard Library—specifically LLVM’s libc++—can deliver meaningful security and reliability gains at massive scale with minimal performance overhead.
This post is in response to two claims about coroutines: 1) Their reference function parameters may become dangling too easily, and 2) They are indistinguishable from regular functions from the declaration alone.
