base/win/scoped_hglobal.h

// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_WIN_SCOPED_HGLOBAL_H_
#define BASE_WIN_SCOPED_HGLOBAL_H_

#include <windows.h>

#include "base/basictypes.h"

namespace base {
namespace win {

// Like ScopedHandle except for HGLOBAL.
template<class T>
class ScopedHGlobal {
 public:
  explicit ScopedHGlobal(HGLOBAL glob) : glob_(glob) {
    data_ = static_cast<T*>(GlobalLock(glob_));
  }
  ~ScopedHGlobal() {
    GlobalUnlock(glob_);
  }

  T* get() { return data_; }

  size_t Size() const { return GlobalSize(glob_); }

  T* operator->() const  {
    assert(data_ != 0);
    return data_;
  }

  T* release() {
    T* data = data_;
    data_ = NULL;
    return data;
  }

 private:
  HGLOBAL glob_;

  T* data_;

  DISALLOW_COPY_AND_ASSIGN(ScopedHGlobal);
};

}  // namespace win
}  // namespace base

#endif  // BASE_WIN_SCOPED_HGLOBAL_H_