diff --git a/objectivec/GPBArray_PackagePrivate.h b/objectivec/GPBArray_PackagePrivate.h
new file mode 100644
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+++ b/objectivec/GPBArray_PackagePrivate.h
@@ -0,0 +1,130 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2015 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 "GPBArray.h"
+
+@class GPBMessage;
+
+//%PDDM-DEFINE DECLARE_ARRAY_EXTRAS()
+//%ARRAY_INTERFACE_EXTRAS(Int32, int32_t)
+//%ARRAY_INTERFACE_EXTRAS(UInt32, uint32_t)
+//%ARRAY_INTERFACE_EXTRAS(Int64, int64_t)
+//%ARRAY_INTERFACE_EXTRAS(UInt64, uint64_t)
+//%ARRAY_INTERFACE_EXTRAS(Float, float)
+//%ARRAY_INTERFACE_EXTRAS(Double, double)
+//%ARRAY_INTERFACE_EXTRAS(Bool, BOOL)
+//%ARRAY_INTERFACE_EXTRAS(Enum, int32_t)
+
+//%PDDM-DEFINE ARRAY_INTERFACE_EXTRAS(NAME, TYPE)
+//%#pragma mark - NAME
+//%
+//%@interface GPB##NAME##Array () {
+//% @package
+//%  GPB_UNSAFE_UNRETAINED GPBMessage *_autocreator;
+//%}
+//%@end
+//%
+
+//%PDDM-EXPAND DECLARE_ARRAY_EXTRAS()
+// This block of code is generated, do not edit it directly.
+
+#pragma mark - Int32
+
+@interface GPBInt32Array () {
+ @package
+  GPB_UNSAFE_UNRETAINED GPBMessage *_autocreator;
+}
+@end
+
+#pragma mark - UInt32
+
+@interface GPBUInt32Array () {
+ @package
+  GPB_UNSAFE_UNRETAINED GPBMessage *_autocreator;
+}
+@end
+
+#pragma mark - Int64
+
+@interface GPBInt64Array () {
+ @package
+  GPB_UNSAFE_UNRETAINED GPBMessage *_autocreator;
+}
+@end
+
+#pragma mark - UInt64
+
+@interface GPBUInt64Array () {
+ @package
+  GPB_UNSAFE_UNRETAINED GPBMessage *_autocreator;
+}
+@end
+
+#pragma mark - Float
+
+@interface GPBFloatArray () {
+ @package
+  GPB_UNSAFE_UNRETAINED GPBMessage *_autocreator;
+}
+@end
+
+#pragma mark - Double
+
+@interface GPBDoubleArray () {
+ @package
+  GPB_UNSAFE_UNRETAINED GPBMessage *_autocreator;
+}
+@end
+
+#pragma mark - Bool
+
+@interface GPBBoolArray () {
+ @package
+  GPB_UNSAFE_UNRETAINED GPBMessage *_autocreator;
+}
+@end
+
+#pragma mark - Enum
+
+@interface GPBEnumArray () {
+ @package
+  GPB_UNSAFE_UNRETAINED GPBMessage *_autocreator;
+}
+@end
+
+//%PDDM-EXPAND-END DECLARE_ARRAY_EXTRAS()
+
+#pragma mark - NSArray Subclass
+
+@interface GPBAutocreatedArray : NSMutableArray {
+ @package
+  GPB_UNSAFE_UNRETAINED GPBMessage *_autocreator;
+}
+@end