base/mac/scoped_aedesc.h

   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/basictypes.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:
  25   ScopedAEDesc() {
  26     AECreateDesc(typeNull, NULL, 0, &desc_);
  27   }
  28
  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.
  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_