////  PortableHighResolutionClock.h//  libraries/shared/src////  Created by Stephen Birarda on 2015-09-14.//  Copyright 2015 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// //  I discovered the low-resolution nature of the VC2012 implementation of std::chrono::high_resolution_clock//  while debugging a UDT issue with packet receive speeds. That lead to//  http://stackoverflow.com/questions/16299029/resolution-of-stdchronohigh-resolution-clock-doesnt-correspond-to-measureme//  which is where the implementation of this class is from. #pragma once #ifndef hifi_PortableHighResolutionClock_h#define hifi_PortableHighResolutionClock_h #include <chrono> #include <QtCore/QMetaType> #if defined(_MSC_VER) && _MSC_VER < 1900 #ifndef WIN32_LEAN_AND_MEAN#define WIN32_LEAN_AND_MEAN#endif#include <windows.h> // The following struct is not compliant with the HF coding standard, but uses underscores to match the classes// in std::chrono struct win_high_resolution_clock {    typedef long long rep;    typedef std::nano period;    typedef std::chrono::duration<rep, period> duration;    typedef std::chrono::time_point<win_high_resolution_clock> time_point;    static const bool is_steady = true;        static time_point now();}; using p_high_resolution_clock = win_high_resolution_clock; #else using p_high_resolution_clock = std::chrono::high_resolution_clock; #endif Q_DECLARE_METATYPE(p_high_resolution_clock::time_point); #if defined(__GNUC__) && !defined(__clang__)__attribute__((unused))#endifstatic const int timePointMetaTypeID = qRegisterMetaType<p_high_resolution_clock::time_point>(); #endif // hifi_PortableHighResolutionClock_h