[PATCH] D38627: [clangd] Added a move-only function helpers.

[Ilya Biryukov via Phabricator via cfe-commits]

ilya-biryukov created this revision.

They are now used in ClangdScheduler instead of deferred std::async
computations.
The results of `std::async` are much less effective and do not provide
a good abstraction for similar purposes, i.e. for storing additional callbacks
to clangd async tasks. The actual callback API will follow a bit later.


https://reviews.llvm.org/D38627

Files:
  clangd/ClangdServer.cpp
  clangd/ClangdServer.h
  clangd/Function.h

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