Support enum forward decls in Objective C++

NS_ENUM changes defintion in Objective C++ based on the C++ spec being
compiled with, special case the one situation where it wouldn't support doing a
forward decl for the enum.

1 files changed, 69 insertions, 0 deletions

diff --git a/objectivec/Tests/GPBObjectiveCPlusPlusTest.mm b/objectivec/Tests/GPBObjectiveCPlusPlusTest.mm
new file mode 100644
index 00000000..9ba8fd0b
--- /dev/null
+++ b/objectivec/Tests/GPBObjectiveCPlusPlusTest.mm
@@ -0,0 +1,69 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2013 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+#import "GPBTestUtilities.h"
+
+
+//
+// This is just a compile test (here to make sure things never regress).
+//
+// Objective C++ can run into issues with how the NS_ENUM/CF_ENUM declartion
+// works because of the C++ spec being used for that compilation unit. So
+// the fact that these imports all work without errors/warning means things
+// are still good.
+//
+// The "well know types" should have cross file enums needing imports.
+#import "GPBProtocolBuffers.h"
+// Some of the tests explicitly use cross file enums also.
+#import "google/protobuf/Unittest.pbobjc.h"
+#import "google/protobuf/UnittestImport.pbobjc.h"
+
+// Sanity check the conditions of the test within the Xcode project.
+#if !__cplusplus
+  #error This isn't compiled as Objective C++?
+#elif __cplusplus >= 201103L
+  // If this trips, it means the Xcode default might have change (or someone
+  // edited the testing project) and it might be time to revisit the GPB_ENUM
+  // define in GPBBootstrap.h.
+  #warning Did the Xcode default for C++ spec change?
+#endif
+
+
+// Dummy XCTest.
+@interface GPBObjectiveCPlusPlusTests : GPBTestCase
+@end
+
+@implementation GPBObjectiveCPlusPlusTests
+- (void)testCPlusPlus {
+  // Nothing, This was a compile test.
+  XCTAssertTrue(YES);
+}
+@end