[c++1z] N4295: fold-expressions.

This is a new form of expression of the form:

  (expr op ... op expr)

where one of the exprs is a parameter pack. It expands into

  (expr1 op (expr2onwards op ... op expr))

(and likewise if the pack is on the right). The non-pack operand can be
omitted; in that case, an empty pack gives a fallback value or an error,
depending on the operator.

llvm-svn: 221573

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/lib/Serialization/ASTWriterStmt.cpp b/clang/lib/Serialization/ASTWriterStmt.cpp
index 61ec6a058b1..309e0a65329 100644
--- a/clang/lib/Serialization/ASTWriterStmt.cpp
+++ b/clang/lib/Serialization/ASTWriterStmt.cpp
@@ -1579,6 +1579,17 @@ void ASTStmtWriter::VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E) {
   Code = serialization::EXPR_MATERIALIZE_TEMPORARY;
 }
 
+void ASTStmtWriter::VisitCXXFoldExpr(CXXFoldExpr *E) {
+  VisitExpr(E);
+  Writer.AddSourceLocation(E->LParenLoc, Record);
+  Writer.AddSourceLocation(E->EllipsisLoc, Record);
+  Writer.AddSourceLocation(E->RParenLoc, Record);
+  Writer.AddStmt(E->SubExprs[0]);
+  Writer.AddStmt(E->SubExprs[1]);
+  Record.push_back(E->Opcode);
+  Code = serialization::EXPR_CXX_FOLD;
+}
+
 void ASTStmtWriter::VisitOpaqueValueExpr(OpaqueValueExpr *E) {
   VisitExpr(E);
   Writer.AddStmt(E->getSourceExpr());