chromium/base/win/windows_version.h

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_WIN_WINDOWS_VERSION_H_
#define BASE_WIN_WINDOWS_VERSION_H_

#include <stddef.h>

#include <string>

#include "base/base_export.h"
#include "base/gtest_prod_util.h"
#include "base/version.h"

DWORD;  // NOLINT(runtime/int)
HANDLE;
struct _OSVERSIONINFOEXW;
struct _SYSTEM_INFO;

namespace base {
namespace test {
class ScopedOSInfoOverride;
}  // namespace test
}  // namespace base

namespace base {
namespace win {

// The running version of Windows.  This is declared outside OSInfo for
// syntactic sugar reasons; see the declaration of GetVersion() below.
// NOTE: Keep these in order so callers can do things like
// "if (base::win::GetVersion() >= base::win::Version::VISTA) ...".
enum class Version { … };

// A rough bucketing of the available types of versions of Windows. This is used
// to distinguish enterprise enabled versions from home versions and potentially
// server versions. Keep these values in the same order, since they are used as
// is for metrics histogram ids.
enum VersionType { … };

// A singleton that can be used to query various pieces of information about the
// OS and process state. Note that this doesn't use the base Singleton class, so
// it can be used without an AtExitManager.
class BASE_EXPORT OSInfo { … };

// Because this is by far the most commonly-requested value from the above
// singleton, we add a global-scope accessor here as syntactic sugar.
BASE_EXPORT Version GetVersion();

}  // namespace win
}  // namespace base

#endif  // BASE_WIN_WINDOWS_VERSION_H_