[all-commits] [llvm/llvm-project] a76e68: [CodeComplete] Member completion for concept-const...

[Sam McCall via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: a76e68c9704fb5b3faf25bb8d51e405b5310ff08
      https://github.com/llvm/llvm-project/commit/a76e68c9704fb5b3faf25bb8d51e405b5310ff08
  Author: Sam McCall <sam.mccall at gmail.com>
  Date:   2020-03-31 (Tue, 31 Mar 2020)

  Changed paths:
    M clang/include/clang/Sema/Scope.h
    M clang/lib/Sema/CodeCompleteConsumer.cpp
    M clang/lib/Sema/SemaCodeComplete.cpp
    A clang/test/CodeCompletion/concepts.cpp

  Log Message:
  -----------
  [CodeComplete] Member completion for concept-constrained types.

Summary:
The basic idea is to walk through the concept definition, looking for
t.foo() where t has the constrained type.

In this patch:
 - nested types are recognized and offered after ::
 - variable/function members are recognized and offered after the correct
   dot/arrow/colon trigger
 - member functions are recognized (anything directly called). parameter
   types are presumed to be the argument types. parameters are unnamed.
 - result types are available when a requirement has a type constraint.
   These are printed as constraints, except same_as<T> which prints as T.

Not in this patch:
 - support for merging/overloading when two locations describe the same member.
   The last one wins, for any given name. This is probably important...
 - support for nested template members (T::x<int>)
 - support for completing members of (instantiations of) template template parameters

Reviewers: nridge, saar.raz

Subscribers: mgrang, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D73649