LCOV - code coverage report
Current view: directory - objdir/dist/include/mozilla - AutoRestore.h (source / functions) Found Hit Coverage
Test: app.info Lines: 5 5 100.0 %
Date: 2012-06-02 Functions: 10 2 20.0 %

       1                 : /* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is nsAutoRestore.h.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is the Mozilla Foundation.
      18                 :  * Portions created by the Initial Developer are Copyright (C) 2009
      19                 :  * the Initial Developer. All Rights Reserved.
      20                 :  *
      21                 :  * Contributor(s):
      22                 :  *   L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      26                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : /* functions for restoring saved values at the end of a C++ scope */
      39                 : 
      40                 : #ifndef mozilla_AutoRestore_h_
      41                 : #define mozilla_AutoRestore_h_
      42                 : 
      43                 : #include "mozilla/GuardObjects.h"
      44                 : 
      45                 : namespace mozilla {
      46                 : 
      47                 :   /**
      48                 :    * Save the current value of a variable and restore it when the object
      49                 :    * goes out of scope.  For example:
      50                 :    *   {
      51                 :    *     AutoRestore<bool> savePainting(mIsPainting);
      52                 :    *     mIsPainting = true;
      53                 :    *     
      54                 :    *     // ... your code here ...
      55                 :    *
      56                 :    *     // mIsPainting is reset to its old value at the end of this block
      57                 :    *   }
      58                 :    */
      59                 :   template <class T>
      60                 :   class NS_STACK_CLASS AutoRestore
      61                 :   {
      62                 :   private:
      63                 :     T& mLocation;
      64                 :     T mValue;
      65                 :     MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
      66                 :   public:
      67             235 :     AutoRestore(T& aValue MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
      68             235 :       : mLocation(aValue), mValue(aValue)
      69                 :     {
      70             235 :       MOZ_GUARD_OBJECT_NOTIFIER_INIT;
      71             235 :     }
      72             235 :     ~AutoRestore() { mLocation = mValue; }
      73                 :   };
      74                 : 
      75                 : } // namespace mozilla
      76                 : 
      77                 : #endif /* !defined(mozilla_AutoRestore_h_) */

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