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+//  boost process_timer.cpp  -----------------------------------------------------------//
+
+//  Copyright Beman Dawes 1994, 2006, 2008
+//  Copyright 2009-2010 Vicente J. Botet Escriba
+//  Copyright (c) Microsoft Corporation 2014
+
+//  Distributed under the Boost Software License, Version 1.0.
+//  See http://www.boost.org/LICENSE_1_0.txt
+
+//  See http://www.boost.org/libs/chrono for documentation.
+
+//--------------------------------------------------------------------------------------//
+#ifndef BOOST_CHRONO_DETAIL_INLINED_WIN_PROCESS_CLOCK_HPP
+#define BOOST_CHRONO_DETAIL_INLINED_WIN_PROCESS_CLOCK_HPP
+
+#include <boost/chrono/config.hpp>
+#include <boost/chrono/process_cpu_clocks.hpp>
+#include <cassert>
+#include <time.h>
+#include <boost/assert.hpp>
+
+#include <boost/detail/winapi/get_last_error.hpp>
+#include <boost/detail/winapi/get_current_process.hpp>
+#if BOOST_PLAT_WINDOWS_DESKTOP
+#include <boost/detail/winapi/get_process_times.hpp>
+#endif
+
+namespace boost
+{
+namespace chrono
+{
+
+process_real_cpu_clock::time_point process_real_cpu_clock::now() BOOST_NOEXCEPT
+{
+    clock_t c = ::clock();
+    if ( c == clock_t(-1) ) // error
+    {
+      BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
+    }
+    typedef ratio_divide<giga, ratio<CLOCKS_PER_SEC> >::type R;
+    return time_point(
+      duration(static_cast<rep>(c)*R::num/R::den)
+    );
+}
+
+#if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
+process_real_cpu_clock::time_point process_real_cpu_clock::now(
+        system::error_code & ec)
+{
+    clock_t c = ::clock();
+    if ( c == clock_t(-1) ) // error
+    {
+            boost::throw_exception(
+                    system::system_error(
+                            errno,
+                            BOOST_CHRONO_SYSTEM_CATEGORY,
+                            "chrono::process_real_cpu_clock" ));
+    }
+    if (!BOOST_CHRONO_IS_THROWS(ec))
+    {
+      ec.clear();
+    }
+    typedef ratio_divide<giga, ratio<CLOCKS_PER_SEC> >::type R;
+    return time_point(
+      duration(static_cast<rep>(c)*R::num/R::den)
+    );
+}
+#endif
+
+#if BOOST_PLAT_WINDOWS_DESKTOP
+process_user_cpu_clock::time_point process_user_cpu_clock::now() BOOST_NOEXCEPT
+{
+
+    //  note that Windows uses 100 nanosecond ticks for FILETIME
+    boost::detail::winapi::FILETIME_ creation, exit, user_time, system_time;
+
+    if ( boost::detail::winapi::GetProcessTimes(
+            boost::detail::winapi::GetCurrentProcess(), &creation, &exit,
+            &system_time, &user_time ) )
+    {
+        return time_point(duration(
+                ((static_cast<process_user_cpu_clock::rep>(user_time.dwHighDateTime) << 32)
+                  | user_time.dwLowDateTime) * 100
+                ));
+    }
+    else
+    {
+        BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
+        return time_point();
+    }
+
+}
+
+#if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
+process_user_cpu_clock::time_point process_user_cpu_clock::now(
+        system::error_code & ec)
+{
+
+    //  note that Windows uses 100 nanosecond ticks for FILETIME
+    boost::detail::winapi::FILETIME_ creation, exit, user_time, system_time;
+
+    if ( boost::detail::winapi::GetProcessTimes(
+            boost::detail::winapi::GetCurrentProcess(), &creation, &exit,
+            &system_time, &user_time ) )
+    {
+        if (!BOOST_CHRONO_IS_THROWS(ec))
+        {
+            ec.clear();
+        }
+        return time_point(duration(
+                ((static_cast<process_user_cpu_clock::rep>(user_time.dwHighDateTime) << 32)
+                  | user_time.dwLowDateTime) * 100
+                ));
+    }
+    else
+    {
+        boost::detail::winapi::DWORD_ cause = boost::detail::winapi::GetLastError();
+        if (BOOST_CHRONO_IS_THROWS(ec))
+        {
+            boost::throw_exception(
+                    system::system_error(
+                            cause,
+                            BOOST_CHRONO_SYSTEM_CATEGORY,
+                            "chrono::process_user_cpu_clock" ));
+        }
+        else
+        {
+            ec.assign( cause, BOOST_CHRONO_SYSTEM_CATEGORY );
+            return time_point();
+        }
+    }
+
+}
+#endif
+
+process_system_cpu_clock::time_point process_system_cpu_clock::now() BOOST_NOEXCEPT
+{
+
+    //  note that Windows uses 100 nanosecond ticks for FILETIME
+    boost::detail::winapi::FILETIME_ creation, exit, user_time, system_time;
+
+    if ( boost::detail::winapi::GetProcessTimes(
+            boost::detail::winapi::GetCurrentProcess(), &creation, &exit,
+            &system_time, &user_time ) )
+    {
+        return time_point(duration(
+                ((static_cast<process_system_cpu_clock::rep>(system_time.dwHighDateTime) << 32)
+                                    | system_time.dwLowDateTime) * 100
+                ));
+    }
+    else
+    {
+      BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
+      return time_point();
+    }
+
+}
+
+#if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
+process_system_cpu_clock::time_point process_system_cpu_clock::now(
+        system::error_code & ec)
+{
+
+    //  note that Windows uses 100 nanosecond ticks for FILETIME
+    boost::detail::winapi::FILETIME_ creation, exit, user_time, system_time;
+
+    if ( boost::detail::winapi::GetProcessTimes(
+            boost::detail::winapi::GetCurrentProcess(), &creation, &exit,
+            &system_time, &user_time ) )
+    {
+        if (!BOOST_CHRONO_IS_THROWS(ec))
+        {
+            ec.clear();
+        }
+        return time_point(duration(
+                ((static_cast<process_system_cpu_clock::rep>(system_time.dwHighDateTime) << 32)
+                                    | system_time.dwLowDateTime) * 100
+                ));
+    }
+    else
+    {
+        boost::detail::winapi::DWORD_ cause = boost::detail::winapi::GetLastError();
+        if (BOOST_CHRONO_IS_THROWS(ec))
+        {
+            boost::throw_exception(
+                    system::system_error(
+                            cause,
+                            BOOST_CHRONO_SYSTEM_CATEGORY,
+                            "chrono::process_system_cpu_clock" ));
+        }
+        else
+        {
+            ec.assign( cause, BOOST_CHRONO_SYSTEM_CATEGORY );
+            return time_point();
+        }
+    }
+
+}
+#endif
+
+process_cpu_clock::time_point process_cpu_clock::now()  BOOST_NOEXCEPT
+{
+
+    //  note that Windows uses 100 nanosecond ticks for FILETIME
+    boost::detail::winapi::FILETIME_ creation, exit, user_time, system_time;
+
+    if ( boost::detail::winapi::GetProcessTimes(
+            boost::detail::winapi::GetCurrentProcess(), &creation, &exit,
+            &system_time, &user_time ) )
+    {
+        time_point::rep r(process_real_cpu_clock::now().time_since_epoch().count()
+                            ,
+                ((static_cast<process_user_cpu_clock::rep>(user_time.dwHighDateTime) << 32)
+                        | user_time.dwLowDateTime
+                ) * 100,
+                ((static_cast<process_system_cpu_clock::rep>(system_time.dwHighDateTime) << 32)
+                        | system_time.dwLowDateTime
+                ) * 100
+        );
+        return time_point(duration(r));
+    }
+    else
+    {
+      BOOST_ASSERT(0 && "Boost::Chrono - Internal Error");
+      return time_point();
+    }
+
+}
+
+#if !defined BOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING
+process_cpu_clock::time_point process_cpu_clock::now(
+        system::error_code & ec )
+{
+
+    //  note that Windows uses 100 nanosecond ticks for FILETIME
+    boost::detail::winapi::FILETIME_ creation, exit, user_time, system_time;
+
+    if ( boost::detail::winapi::GetProcessTimes(
+            boost::detail::winapi::GetCurrentProcess(), &creation, &exit,
+            &system_time, &user_time ) )
+    {
+        if (!BOOST_CHRONO_IS_THROWS(ec))
+        {
+            ec.clear();
+        }
+        time_point::rep r(process_real_cpu_clock::now().time_since_epoch().count()
+                            ,
+                ((static_cast<process_user_cpu_clock::rep>(user_time.dwHighDateTime) << 32)
+                        | user_time.dwLowDateTime
+                ) * 100,
+                ((static_cast<process_system_cpu_clock::rep>(system_time.dwHighDateTime) << 32)
+                        | system_time.dwLowDateTime
+                ) * 100
+        );
+        return time_point(duration(r));
+    }
+    else
+    {
+        boost::detail::winapi::DWORD_ cause = boost::detail::winapi::GetLastError();
+        if (BOOST_CHRONO_IS_THROWS(ec))
+        {
+            boost::throw_exception(
+                    system::system_error(
+                            cause,
+                            BOOST_CHRONO_SYSTEM_CATEGORY,
+                            "chrono::process_cpu_clock" ));
+        }
+        else
+        {
+            ec.assign( cause, BOOST_CHRONO_SYSTEM_CATEGORY );
+            return time_point();
+        }
+    }
+
+}
+#endif
+#endif
+} // namespace chrono
+} // namespace boost
+
+#endif