From 3ecc67784aa9ee44953c743362023015e9a09a56 Mon Sep 17 00:00:00 2001
From: Alexander Karatarakis <alkarata@microsoft.com>
Date: Mon, 10 Oct 2016 18:12:26 -0700
Subject: Add Stopwatch class

---
 toolsrc/src/Stopwatch.cpp | 104 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 toolsrc/src/Stopwatch.cpp

(limited to 'toolsrc/src/Stopwatch.cpp')

diff --git a/toolsrc/src/Stopwatch.cpp b/toolsrc/src/Stopwatch.cpp
new file mode 100644
index 000000000..035d54c2b
--- /dev/null
+++ b/toolsrc/src/Stopwatch.cpp
@@ -0,0 +1,104 @@
+#include "Stopwatch.h"
+#include "vcpkg_Checks.h"
+
+namespace vcpkg
+{
+    Stopwatch Stopwatch::createUnstarted()
+    {
+        return Stopwatch();
+    }
+
+    Stopwatch Stopwatch::createStarted()
+    {
+        return Stopwatch().start();
+    }
+
+    bool Stopwatch::isRunning() const
+    {
+        return this->m_isRunning;
+    }
+
+    Stopwatch& Stopwatch::start()
+    {
+        Checks::check_exit(!this->m_isRunning, "This stopwatch is already running.");
+        this->m_isRunning = true;
+        this->m_startTick = std::chrono::high_resolution_clock::now();
+        return *this;
+    }
+
+    Stopwatch& Stopwatch::stop()
+    {
+        auto tick = std::chrono::high_resolution_clock::now();
+        Checks::check_exit(this->m_isRunning, "This stopwatch is already stopped.");
+        this->m_isRunning = false;
+        this->m_elapsedNanos += tick - this->m_startTick;
+        return *this;
+    }
+
+    Stopwatch& Stopwatch::reset()
+    {
+        this->m_elapsedNanos = std::chrono::nanoseconds();
+        this->m_isRunning = false;
+        return *this;
+    }
+
+    std::string Stopwatch::toString() const
+    {
+        using std::chrono::hours;
+        using std::chrono::minutes;
+        using std::chrono::seconds;
+        using std::chrono::milliseconds;
+        using std::chrono::microseconds;
+        using std::chrono::nanoseconds;
+        using std::chrono::duration_cast;
+
+        auto nanos = elapsedNanos();
+        auto nanos_as_double = static_cast<double>(nanos.count());
+
+        if (duration_cast<hours>(nanos) > hours())
+        {
+            auto t = nanos_as_double / duration_cast<nanoseconds>(hours(1)).count();
+            return Strings::format("%.4g h", t);
+        }
+
+        if (duration_cast<minutes>(nanos) > minutes())
+        {
+            auto t = nanos_as_double / duration_cast<nanoseconds>(minutes(1)).count();
+            return Strings::format("%.4g min", t);
+        }
+
+        if (duration_cast<seconds>(nanos) > seconds())
+        {
+            auto t = nanos_as_double / duration_cast<nanoseconds>(seconds(1)).count();
+            return Strings::format("%.4g s", t);
+        }
+
+        if (duration_cast<milliseconds>(nanos) > milliseconds())
+        {
+            auto t = nanos_as_double / duration_cast<nanoseconds>(milliseconds(1)).count();
+            return Strings::format("%.4g ms", t);
+        }
+
+        if (duration_cast<microseconds>(nanos) > microseconds())
+        {
+            auto t = nanos_as_double / duration_cast<nanoseconds>(microseconds(1)).count();
+            return Strings::format("%.4g micros", t);
+        }
+
+        return Strings::format("%.4g ns", nanos_as_double);
+    }
+
+    Stopwatch::Stopwatch() : m_isRunning(false), m_elapsedNanos(), m_startTick()
+    {
+    }
+
+    std::chrono::nanoseconds Stopwatch::elapsedNanos() const
+    {
+        if (this->m_isRunning)
+        {
+            return std::chrono::high_resolution_clock::now() - this->m_startTick + this->m_elapsedNanos;
+        }
+
+        return this->m_elapsedNanos;
+    }
+}
-- 
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