Introduce a new type, PackExpansionType, to capture types that are

pack expansions, e.g. given

  template<typename... Types> struct tuple;

  template<typename... Types>
  struct tuple_of_refs {
    typedef tuple<Types&...> types;
  };

the type of the "types" typedef is a PackExpansionType whose pattern
is Types&. 

This commit introduces support for creating pack expansions for
template type arguments, as above, but not for any other kind of pack
expansion, nor for any form of instantiation.

llvm-svn: 122223

1 files changed, 5 insertions, 0 deletions

diff --git a/clang/lib/Parse/ParseTemplate.cpp b/clang/lib/Parse/ParseTemplate.cpp
index 333d72a754c..d38d0599ac2 100644
--- a/clang/lib/Parse/ParseTemplate.cpp
+++ b/clang/lib/Parse/ParseTemplate.cpp
@@ -1045,6 +1045,11 @@ bool
 Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) {
   while (true) {
     ParsedTemplateArgument Arg = ParseTemplateArgument();
+    if (Tok.is(tok::ellipsis)) {
+      SourceLocation EllipsisLoc  = ConsumeToken();
+      Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
+    }
+
     if (Arg.isInvalid()) {
       SkipUntil(tok::comma, tok::greater, true, true);
       return true;