Make scoped enums output streamable.

base/logging_unittest.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/logging.h"
+
+#include <sstream>
+
 #include "base/compiler_specific.h"
-#include "base/logging.h"
 #include "base/macros.h"
 
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace logging {
 
 namespace {
 
 using ::testing::Return;
@@ skipping 252 matching lines @@
   if (false)
     CHECK_EQ(false, true);           // Unreached.
   else
     CHECK_EQ(true, reached = true);  // Reached, passed.
   ASSERT_TRUE(reached);
 
   if (false)
     CHECK_EQ(false, true);           // Unreached.
 }
 
+// Test that scoped enums can be logged.
+TEST_F(LoggingTest, ScopedEnum) {
+#if 0
+  std::ostringstream ss1;
+  // Default underlying type is int.
+  enum class SignedTestEnum {
+    Value = -1,
+  };
+  ss1 << SignedTestEnum::Value;
+  EXPECT_EQ("-1", ss1.str());
+
+  std::ostringstream ss2;
+  enum class UnsignedTestEnum : unsigned {
+    Value = -1,  // This is intentional.
+  };
+  ss2 << UnsignedTestEnum::Value;
+  EXPECT_EQ("0xffffffff", ss2.str());
+#endif
+}
+
 // Test that defining an operator<< for a type in a namespace doesn't prevent
 // other code in that namespace from calling the operator<<(ostream, wstring)
 // defined by logging.h. This can fail if operator<<(ostream, wstring) can't be
 // found by ADL, since defining another operator<< prevents name lookup from
 // looking in the global namespace.
 namespace nested_test {
   class Streamable {};
   ALLOW_UNUSED_TYPE std::ostream& operator<<(std::ostream& out,
                                              const Streamable&) {
     return out << "Streamable";
   }
   TEST_F(LoggingTest, StreamingWstringFindsCorrectOperator) {
     std::wstring wstr = L"Hello World";
     std::ostringstream ostr;
     ostr << wstr;
     EXPECT_EQ("Hello World", ostr.str());
   }
 }  // namespace nested_test
 
 }  // namespace
 
 }  // namespace logging