Add symmetric-transfer versions of task/async_generator for clang.

lewissbaker / cppcoro

A library of C++ coroutine abstractions for the coroutines TS

MIT License

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Closed lewissbaker closed 6 years ago

lewissbaker commented 6 years ago

Switch based on the new CPPCORO_COMPILER_SUPPORTS_SYMMETRIC_TRANSFER macro which is currently only defined for Clang >= 7.