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      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_
     53