C++ 20: Move vnext to C++ 20 and C++ 20 coroutines #12331
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This moves projects in vnext to build with C++ 20 and C++ 20 coroutines. This should not impact the ABI of MSRN DLLs, but may need care for cases of Folly at legacy ABI boundary.
<CppStandard>stdcpp20</CppStandard>
inReact.cpp.props
/await
to opt into coroutines TSstd::experimental::coroutine_handle
withstd::coroutine_handle
This depends on the earlier changes being merged, along with the rest of the
std::future
usages as a coroutine return type replaced (e.g. with winrt types).Also needed to bump Folly version due to facebook/folly@d62707b.
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