headers/private/package/hpkg/Stacker.h

   1 /*
   2  * Copyright 2009, Ingo Weinhold, ingo_weinhold@gmx.de.
   3  * Distributed under the terms of the MIT License.
   4  */
   5 #ifndef _PACKAGE__HPKG__PRIVATE__STACKER_H_
   6 #define _PACKAGE__HPKG__PRIVATE__STACKER_H_
   7
   8
   9 namespace BPackageKit {
  10
  11 namespace BHPKG {
  12
  13 namespace BPrivate {
  14
  15
  16 template<typename Type>
  17 class Stacker {
  18 public:
  19         Stacker(Type*& location, Type* element)
  20                 :
  21                 fLocation(&location),
  22                 fPreviousElement(location)
  23         {
  24                 *fLocation = element;
  25         }
  26
  27         Stacker(Type** location, Type* element)
  28                 :
  29                 fLocation(location),
  30                 fPreviousElement(*location)
  31         {
  32                 *fLocation = element;
  33         }
  34
  35         ~Stacker()
  36         {
  37                 if (fLocation != NULL)
  38                         *fLocation = fPreviousElement;
  39         }
  40
  41 private:
  42         Type**  fLocation;
  43         Type*   fPreviousElement;
  44 };
  45
  46
  47 }       // namespace BPrivate
  48
  49 }       // namespace BHPKG
  50
  51 }       // namespace BPackageKit
  52
  53
  54 #endif  // _PACKAGE__HPKG__PRIVATE__STACKER_H_