scoped_nsautorelease_pool.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

// Copyright (c) 2008 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.

#ifndef BASE_SCOPED_NSAUTORELEASE_POOL_H_

#define BASE_SCOPED_NSAUTORELEASE_POOL_H_

#include "base/basictypes.h"

#if defined(XP_DARWIN)

#  if defined(__OBJC__)

@class NSAutoreleasePool;

#  else   // __OBJC__

class NSAutoreleasePool;

#  endif  // __OBJC__

#endif    // XP_DARWIN

namespace base {

// On the Mac, ScopedNSAutoreleasePool allocates an NSAutoreleasePool when

// instantiated and sends it a -drain message when destroyed.  This allows an

// autorelease pool to be maintained in ordinary C++ code without bringing in

// any direct Objective-C dependency.

//

// On other platforms, ScopedNSAutoreleasePool is an empty object with no

// effects.  This allows it to be used directly in cross-platform code without

// ugly #ifdefs.

class ScopedNSAutoreleasePool {

 public:

#if !defined(XP_DARWIN)

  ScopedNSAutoreleasePool() {}

  void Recycle() {}

#else   // XP_DARWIN

  ScopedNSAutoreleasePool();

  ~ScopedNSAutoreleasePool();

  // Clear out the pool in case its position on the stack causes it to be

  // alive for long periods of time (such as the entire length of the app).

  // Only use then when you're certain the items currently in the pool are

  // no longer needed.

  void Recycle();

 private:

  NSAutoreleasePool* autorelease_pool_;

#endif  // XP_DARWIN

 private:

  DISALLOW_COPY_AND_ASSIGN(ScopedNSAutoreleasePool);

};

}  // namespace base

#endif  // BASE_SCOPED_NSAUTORELEASE_POOL_H_