Initial checkin of gRPC to third_party/

third_party/grpc/src/objective-c/RxLibrary/NSEnumerator+GRXUtil.h

-/* Copyright (c) 2005-2007, Google Inc.
+/*
+ *
+ * Copyright 2015, Google Inc.
  * All rights reserved.
  *
  * 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.
  *
- * ---
- * Author: Markus Gutschke
  */
 
-#ifndef _LINUXTHREADS_H
-#define _LINUXTHREADS_H
+#import <Foundation/Foundation.h>
 
-/* Include thread_lister.h to get the interface that we implement for linux.
+@interface NSEnumerator (GRXUtil)
+
+/**
+ * Returns a NSEnumerator instance that iterates through the elements of the passed container that
+ * supports fast enumeration. Note that this negates the speed benefits of fast enumeration over
+ * NSEnumerator. It's only intended for the rare cases when one needs the latter and only has the
+ * former, e.g. for iteration that needs to be paused and resumed later.
  */
++ (NSEnumerator *)grx_enumeratorWithContainer:(id<NSFastEnumeration>)container;
 
-/* We currently only support x86-32 and x86-64 on Linux. Porting to other
- * related platforms should not be difficult.
+/**
+ * Returns a NSEnumerator instance that provides a single object before finishing. The value is then
+ * released.
  */
-#if (defined(__i386__) || defined(__x86_64__) || defined(__ARM_ARCH_3__) || \
-     defined(__mips__) || defined(__PPC__)) && defined(__linux)
++ (NSEnumerator *)grx_enumeratorWithSingleValue:(id)value;
 
-/* Define the THREADS symbol to make sure that there is exactly one core dumper
- * built into the library.
+/**
+ * Returns a NSEnumerator instance that delegates the invocations of nextObject to the passed block.
+ * When the block first returns nil, it is released.
  */
-#define THREADS "Linux /proc"
-
-#endif
-
-#endif  /* _LINUXTHREADS_H */
++ (NSEnumerator *)grx_enumeratorWithValueSupplier:(id (^)())block;
+@end