Lewis Baker

Add support for std::optional<T> coroutine that allows unwrapping optional values using co_await

2

See https://github.com/toby-allsopp/coroutine_monad for inspiration. ```c++ std::optional parse_int(const std::string_view& s); std::optional parse_int_pair(const std::string_view& a, const std::string_view& b) { co_return std::make_tuple(co_await parse_int(a), co_await parse_int(b)); } ```

Add support for Linux

37

While most of cppcoro is platform agnostic, some of the thread-pooling and I/O code is OS-specific. This issue is for providing an implemention of the cppcoro I/O abstractions for Linux....

Remove use of std::atomic in task and async_generator once symmetric transfer is available

5

The current implementation of `task` and `async_generator` make use of atomics to arbitrate between a potential race between the awaiting consumer suspending while waiting for a value to be produced...

Allow using a custom allocator for allocating the coroutine frame memory

6

Allow callers to specify a custom allocator to use for allocating the coroutine frame. General usage guide: ```c++ struct MyAllocator { MyAllocator(); MyAllocator(const MyAllocator&); ~MyAllocator(); void* allocate(std::size_t sz); void free(void*...

Add concurrency abstraction for server connection-handling workloads

5

The `when_all` concurrency primitive currently requires that all of the tasks are created up front whereas with server workloads we'll typically be dynamically starting new tasks to handle the connections...

Split async I/O functionality into a separate 'cppcoro_io' library

2

As discussed in https://github.com/lewissbaker/cppcoro/issues/46#issuecomment-328516796 the async I/O facilities provided by cppcoro should be split out into a separate library to allow applications to make use of the generic, core components...

Random test failure of schedule_on() operator tests under msvc x86 debug

5

There have been some random test-failures on the CI servers. eg. This [test run](https://ci.appveyor.com/project/lewissbaker/cppcoro/build/1.0.140/job/xwimhya3f2jwp024) failed with: ``` c:\projects\cppcoro\test\scheduling_operator_tests.cpp(21) TEST SUITE: schedule/resume_on TEST CASE: schedule_on task function c:\projects\cppcoro\test\scheduling_operator_tests.cpp(40) ERROR! CHECK( std::this_thread::get_id()...