Context can do what Tagged was intended to support (snapshot filesystems),
and less intrusively.
getTaggedFileSystem() no longer needs a filename.
Cleanups while here:
- code-complete now returns errors as Expected, like other functions
- added an alias Callback<T> for the usual callback function type
llvm-svn: 327344
Summary:
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.
Reviewers: klimek, bkramer, sammccall, krasimir
Reviewed By: sammccall
Subscribers: cfe-commits
Differential Revision: https://reviews.llvm.org/D38627
llvm-svn: 315210
Sam McCall