base/win/scoped_hglobal.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_WIN_SCOPED_HGLOBAL_H_
   6 #define BASE_WIN_SCOPED_HGLOBAL_H_
   7
   8 #include <windows.h>
   9
  10 #include "base/basictypes.h"
  11
  12 namespace base {
  13 namespace win {
  14
  15 // Like ScopedHandle except for HGLOBAL.
  16 template<class T>
  17 class ScopedHGlobal {
  18  public:
  19   explicit ScopedHGlobal(HGLOBAL glob) : glob_(glob) {
  20     data_ = static_cast<T*>(GlobalLock(glob_));
  21   }
  22   ~ScopedHGlobal() {
  23     GlobalUnlock(glob_);
  24   }
  25
  26   T* get() { return data_; }
  27
  28   size_t Size() const { return GlobalSize(glob_); }
  29
  30   T* operator->() const  {
  31     assert(data_ != 0);
  32     return data_;
  33   }
  34
  35   T* release() {
  36     T* data = data_;
  37     data_ = NULL;
  38     return data;
  39   }
  40
  41  private:
  42   HGLOBAL glob_;
  43
  44   T* data_;
  45
  46   DISALLOW_COPY_AND_ASSIGN(ScopedHGlobal);
  47 };
  48
  49 }  // namespace win
  50 }  // namespace base
  51
  52 #endif  // BASE_WIN_SCOPED_HGLOBAL_H_