Emit an error for enum increments and decrements in C++ mode.

Fixes PR16394.

llvm-svn: 187955

1 files changed, 16 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/enum-increment.cpp b/clang/test/SemaCXX/enum-increment.cpp
new file mode 100644
index 00000000000..dc1a921852e
--- /dev/null
+++ b/clang/test/SemaCXX/enum-increment.cpp
@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 -fsyntax-only %s -verify
+
+enum A { A1, A2, A3 };
+void test() {
+  A a;
+  a++;  // expected-error{{cannot increment expression of enum type 'A'}}
+  a--;  // expected-error{{cannot decrement expression of enum type 'A'}}
+  ++a;  // expected-error{{cannot increment expression of enum type 'A'}}
+  --a;  // expected-error{{cannot decrement expression of enum type 'A'}}
+}
+
+enum B {B1, B2};
+inline B &operator++ (B &b) { b = B((int)b+1); return b; }
+inline B operator++ (B &b, int) { B ret = b; ++b; return b; }
+
+void foo(enum B b) { ++b; b++; }