ceph/src/boost/libs/log/src/windows/auto_handle.hpp

   1 /*
   2  *              Copyright Andrey Semashev 2016.
   3  * Distributed under the Boost Software License, Version 1.0.
   4  *    (See accompanying file LICENSE_1_0.txt or copy at
   5  *          http://www.boost.org/LICENSE_1_0.txt)
   6  */
   7 /*!
   8  * \file   windows/auto_handle.hpp
   9  * \author Andrey Semashev
  10  * \date   07.03.2016
  11  *
  12  * \brief  This header is the Boost.Log library implementation, see the library documentation
  13  *         at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
  14  */
  15
  16 #ifndef BOOST_LOG_WINDOWS_AUTO_HANDLE_HPP_INCLUDED_
  17 #define BOOST_LOG_WINDOWS_AUTO_HANDLE_HPP_INCLUDED_
  18
  19 #include <boost/log/detail/config.hpp>
  20 #include <boost/assert.hpp>
  21 #include <boost/winapi/handles.hpp>
  22 #include <boost/log/detail/header.hpp>
  23
  24 namespace boost {
  25
  26 BOOST_LOG_OPEN_NAMESPACE
  27
  28 namespace ipc {
  29
  30 namespace aux {
  31
  32 //! A wrapper around a kernel object handle. Automatically closes the handle on destruction.
  33 class auto_handle
  34 {
  35 private:
  36     boost::winapi::HANDLE_ m_handle;
  37
  38 public:
  39     explicit auto_handle(boost::winapi::HANDLE_ h = NULL) BOOST_NOEXCEPT : m_handle(h)
  40     {
  41     }
  42
  43     ~auto_handle() BOOST_NOEXCEPT
  44     {
  45         if (m_handle)
  46             BOOST_VERIFY(boost::winapi::CloseHandle(m_handle) != 0);
  47     }
  48
  49     void init(boost::winapi::HANDLE_ h) BOOST_NOEXCEPT
  50     {
  51         BOOST_ASSERT(m_handle == NULL);
  52         m_handle = h;
  53     }
  54
  55     boost::winapi::HANDLE_ get() const BOOST_NOEXCEPT { return m_handle; }
  56     boost::winapi::HANDLE_* get_ptr() BOOST_NOEXCEPT { return &m_handle; }
  57
  58     void swap(auto_handle& that) BOOST_NOEXCEPT
  59     {
  60         boost::winapi::HANDLE_ h = m_handle;
  61         m_handle = that.m_handle;
  62         that.m_handle = h;
  63     }
  64
  65     BOOST_DELETED_FUNCTION(auto_handle(auto_handle const&))
  66     BOOST_DELETED_FUNCTION(auto_handle& operator=(auto_handle const&))
  67 };
  68
  69 } // namespace aux
  70
  71 } // namespace ipc
  72
  73 BOOST_LOG_CLOSE_NAMESPACE // namespace log
  74
  75 } // namespace boost
  76
  77 #include <boost/log/detail/footer.hpp>
  78
  79 #endif // BOOST_LOG_WINDOWS_AUTO_HANDLE_HPP_INCLUDED_