Implement the preference for move-construction over copy-construction

when returning an NRVO candidate expression. For example, this
properly picks the move constructor when dealing with code such as

  MoveOnlyType f() { MoveOnlyType mot; return mot; }

The previously-XFAIL'd rvalue-references test case now works, and has
been moved into the appropriate paragraph-specific test case.

llvm-svn: 123992

1 files changed, 3 insertions, 1 deletions

diff --git a/clang/test/SemaCXX/rval-references-examples.cpp b/clang/test/SemaCXX/rval-references-examples.cpp
index 1cde5854ba2..778924d6575 100644
--- a/clang/test/SemaCXX/rval-references-examples.cpp
+++ b/clang/test/SemaCXX/rval-references-examples.cpp
@@ -59,7 +59,7 @@ unique_ptr<T> make_unique_ptr(Args &&...args) {
 
 template<typename T> void accept_unique_ptr(unique_ptr<T>); // expected-note{{passing argument to parameter here}}
 
-void test_unique_ptr() {
+unique_ptr<int> test_unique_ptr() {
   // Simple construction
   unique_ptr<int> p;
   unique_ptr<int> p1(new int);
@@ -85,4 +85,6 @@ void test_unique_ptr() {
 
   // Implicit copies (failures);
   accept_unique_ptr(p); // expected-error{{call to deleted constructor of 'unique_ptr<int>'}}
+
+  return p;
 }