1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef BASE_MAC_SCOPED_AEDESC_H_
6 #define BASE_MAC_SCOPED_AEDESC_H_
7 
8 #import <CoreServices/CoreServices.h>
9 
10 #include "base/macros.h"
11 
12 namespace base {
13 namespace mac {
14 
15 // The ScopedAEDesc is used to scope AppleEvent descriptors.  On creation,
16 // it will store a NULL descriptor.  On destruction, it will dispose of the
17 // descriptor.
18 //
19 // This class is parameterized for additional type safety checks.  You can use
20 // the generic AEDesc type by not providing a template parameter:
21 //  ScopedAEDesc<> desc;
22 template <typename AEDescType = AEDesc>
23 class ScopedAEDesc {
24  public:
ScopedAEDesc()25   ScopedAEDesc() {
26     AECreateDesc(typeNull, NULL, 0, &desc_);
27   }
28 
~ScopedAEDesc()29   ~ScopedAEDesc() {
30     AEDisposeDesc(&desc_);
31   }
32 
33   // Used for in parameters.
34   operator const AEDescType*() {
35     return &desc_;
36   }
37 
38   // Used for out parameters.
OutPointer()39   AEDescType* OutPointer() {
40     return &desc_;
41   }
42 
43  private:
44   AEDescType desc_;
45 
46   DISALLOW_COPY_AND_ASSIGN(ScopedAEDesc);
47 };
48 
49 }  // namespace mac
50 }  // namespace base
51 
52 #endif  // BASE_MAC_SCOPED_AEDESC_H_
53