1 files changed, 63 insertions, 0 deletions
diff --git a/toolsrc/src/vcpkg_Chrono.cpp b/toolsrc/src/vcpkg_Chrono.cpp
new file mode 100644
index 000000000..e39842df9
--- /dev/null
+++ b/toolsrc/src/vcpkg_Chrono.cpp
@@ -0,0 +1,63 @@
+#include "pch.h"
+#include "vcpkg_Chrono.h"
+#include "vcpkg_Checks.h"
+
+namespace vcpkg
+{
+    static std::string format_time_userfriendly(const std::chrono::nanoseconds& nanos)
+    {
+        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;
+
+        const double 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 us", t);
+        }
+
+        return Strings::format("%.4g ns", nanos_as_double);
+    }
+
+    ElapsedTime ElapsedTime::createStarted()
+    {
+        ElapsedTime t;
+        t.m_startTick = std::chrono::high_resolution_clock::now();
+        return t;
+    }
+
+    std::string ElapsedTime::toString() const
+    {
+        return format_time_userfriendly(elapsed<std::chrono::nanoseconds>());
+    }
+}