Tiny Stackless Coroutine in C++14

based on Duff's device(https://en.wikipedia.org/wiki/Duff%27s_device)

Hightlights

• super lightweight with only one header file.
• support async & await with simple syntax.
• support await all in parallel.
• can very easily convert callback style API to awaitables.
• auto propagate exceptions to caller.
• can customize the scheduler.
• only need c++14.
• no other dependencies except STL.

Limitations

• the default scheduler is single threaded.
• memory & performance optimization.

Compiler support

• gcc > 4.9
• clang > 3.4
• vs 2017 (should work in 2015)

Simple example:

CoFunc(string) fs_read_all(const char* fname)
{
	string content;
	const char* cur;
	int fd;
	CoBegin;
	
	CoAwait(fd, fs_open(fname, O_RDONLY));
	for (;;) {
		CoAwait(cur, fs_read(fd, content.length()));
		if (cur == nullptr)
			break;
		content += cur;
	}
	CoAwait(fs_close(fd));
	CoReturn(content);
	
	CoEnd;
};

See example.cpp for more samples.

License

The MIT License