From dc6dd682ff95318a1f54d734c5f5237262589d34 Mon Sep 17 00:00:00 2001
From: Nomango <nomango@qq.com>
Date: Sun, 24 May 2020 12:00:47 +0800
Subject: [PATCH] add ClockTime

---
 src/kiwano/core/Time.cpp | 82 ++++++++++++++++++++++++++++++++++++++++
 src/kiwano/core/Time.h   | 45 ++++++++++++++++++++++
 2 files changed, 127 insertions(+)

diff --git a/src/kiwano/core/Time.cpp b/src/kiwano/core/Time.cpp
index e08fba77..969c4bee 100644
--- a/src/kiwano/core/Time.cpp
+++ b/src/kiwano/core/Time.cpp
@@ -98,6 +98,88 @@ Time Time::Now() noexcept
 #endif
 }
 
+//-------------------------------------------------------
+// ClockTime
+//-------------------------------------------------------
+
+ClockTime::ClockTime()
+    : ms_since_epoch_(0)
+{
+}
+
+long ClockTime::GetTimeStamp() const
+{
+    using std::chrono::duration_cast;
+    using std::chrono::milliseconds;
+    using std::chrono::seconds;
+
+    const auto timestamp = duration_cast<seconds>(milliseconds(ms_since_epoch_)).count();
+    return static_cast<long>(timestamp);
+}
+
+long ClockTime::GetMillisecondsSinceEpoch() const
+{
+    return ms_since_epoch_;
+}
+
+std::time_t ClockTime::GetCTime() const
+{
+    return static_cast<time_t>(GetTimeStamp());
+}
+
+ClockTime::ClockTime(long ms_since_epoch)
+    : ms_since_epoch_(ms_since_epoch)
+{
+}
+
+ClockTime ClockTime::FromTimeStamp(long timestamp) noexcept
+{
+    using std::chrono::duration_cast;
+    using std::chrono::milliseconds;
+    using std::chrono::seconds;
+
+    const auto ms = duration_cast<milliseconds>(seconds(timestamp)).count();
+    return ClockTime(static_cast<long>(ms));
+}
+
+ClockTime ClockTime::Now() noexcept
+{
+    using std::chrono::duration_cast;
+    using std::chrono::milliseconds;
+    using std::chrono::system_clock;
+
+    const auto      now   = system_clock::now();
+    const long long count = duration_cast<milliseconds>(now.time_since_epoch()).count();
+    return ClockTime{ static_cast<long>(count) };
+}
+
+const Duration ClockTime::operator-(const ClockTime& other) const
+{
+    return Duration(ms_since_epoch_ - other.ms_since_epoch_);
+}
+
+const ClockTime ClockTime::operator+(const Duration& dur) const
+{
+    return ClockTime{ ms_since_epoch_ + dur.Milliseconds() };
+}
+
+const ClockTime ClockTime::operator-(const Duration& dur) const
+{
+    return ClockTime{ ms_since_epoch_ - dur.Milliseconds() };
+}
+
+ClockTime& ClockTime::operator+=(const Duration& other)
+{
+    ms_since_epoch_ += other.Milliseconds();
+    return (*this);
+}
+
+ClockTime& ClockTime::operator-=(const Duration& other)
+{
+    ms_since_epoch_ -= other.Milliseconds();
+    return (*this);
+}
+
 //-------------------------------------------------------
 // Duration
 //-------------------------------------------------------
diff --git a/src/kiwano/core/Time.h b/src/kiwano/core/Time.h
index e563c440..5f86341e 100644
--- a/src/kiwano/core/Time.h
+++ b/src/kiwano/core/Time.h
@@ -20,6 +20,7 @@
 
 #pragma once
 #include <kiwano/core/Common.h>
+#include <ctime>
 
 namespace kiwano
 {
@@ -198,6 +199,49 @@ private:
     long dur_;
 };
 
+/**
+ * \~chinese
+ * @brief 时钟时间
+ */
+struct KGE_API ClockTime
+{
+    ClockTime();
+
+    /// \~chinese
+    /// @brief 获取当前时间戳
+    long GetTimeStamp() const;
+
+    /// \~chinese
+    /// @brief 获取自纪元以来的毫秒数
+    long GetMillisecondsSinceEpoch() const;
+
+    /// \~chinese
+    /// @brief 获取 C 风格的时间
+    std::time_t GetCTime() const;
+
+    /// \~chinese
+    /// @brief 获取当前时间
+    static ClockTime Now() noexcept;
+
+    /// \~chinese
+    /// @brief 时间戳转化为时间
+    static ClockTime FromTimeStamp(long timestamp) noexcept;
+
+    const Duration operator-(const ClockTime&) const;
+
+    const ClockTime operator+(const Duration&) const;
+    const ClockTime operator-(const Duration&) const;
+
+    ClockTime& operator+=(const Duration&);
+    ClockTime& operator-=(const Duration&);
+
+private:
+    ClockTime(long ms_since_epoch);
+
+private:
+    long ms_since_epoch_;
+};
+
 inline long Duration::Milliseconds() const
 {
     return milliseconds_;
@@ -232,6 +276,7 @@ inline bool Time::IsZero() const
 {
     return dur_ == 0;
 }
+
 }  // namespace kiwano
 
 #if defined(KGE_HAS_LITERALS)