3 files changed, 46 insertions, 1 deletions
diff --git a/toolsrc/include/Stopwatch.h b/toolsrc/include/Stopwatch.h
new file mode 100644
index 000000000..2bd5c31bf
--- /dev/null
+++ b/toolsrc/include/Stopwatch.h
@@ -0,0 +1,40 @@
+#pragma once
+
+#include <chrono>
+#include <string>
+
+namespace vcpkg
+{
+    class Stopwatch
+    {
+    public:
+        static Stopwatch createUnstarted();
+
+        static Stopwatch createStarted();
+
+        bool isRunning() const;
+
+        Stopwatch& start();
+
+        Stopwatch& stop();
+
+        Stopwatch& reset();
+
+        template <class TimeUnit>
+        TimeUnit elapsed() const
+        {
+            return std::chrono::duration_cast<TimeUnit>(elapsedNanos());
+        }
+
+        std::string toString() const;
+
+    private:
+        Stopwatch();
+
+        std::chrono::nanoseconds elapsedNanos() const;
+
+        bool m_isRunning;
+        std::chrono::nanoseconds m_elapsedNanos;
+        std::chrono::steady_clock::time_point m_startTick;
+    };
+}
diff --git a/toolsrc/include/vcpkg_Strings.h b/toolsrc/include/vcpkg_Strings.h
index 2aa99afe0..70526198c 100644
--- a/toolsrc/include/vcpkg_Strings.h
+++ b/toolsrc/include/vcpkg_Strings.h
@@ -19,6 +19,11 @@ namespace vcpkg {namespace Strings {namespace details
         return s;
     }
 
+    inline double to_printf_arg(const double s)
+    {
+        return s;
+    }
+
     inline size_t to_printf_arg(const size_t s)
     {
         return s;
diff --git a/toolsrc/include/vcpkg_System.h b/toolsrc/include/vcpkg_System.h
index f47fc9aab..c420464c1 100644
--- a/toolsrc/include/vcpkg_System.h
+++ b/toolsrc/include/vcpkg_System.h
@@ -64,7 +64,7 @@ namespace vcpkg {namespace System
         return println(c, Strings::format(messageTemplate, messageArgs...).c_str());
     }
 
-    struct Stopwatch
+    struct Stopwatch2
     {
         int64_t start_time, end_time, freq;