From 8738192476cd5bf684cd81f92b5128cb3b9d5e3e Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Thu, 23 Jul 2015 17:37:43 +1000
Subject: [PATCH] log: add scoped timer

---
 log.cpp | 20 ++++++++++++++++++++
 log.hpp | 12 ++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/log.cpp b/log.cpp
index a4798688..9f197995 100644
--- a/log.cpp
+++ b/log.cpp
@@ -19,6 +19,7 @@
 
 #include "debug.hpp"
 #include "types.hpp"
+#include "time.hpp"
 
 #include <array>
 #include <ctime>
@@ -158,3 +159,22 @@ scoped_logger::~scoped_logger ()
 {
     log (m_level, m_message);
 }
+
+
+///////////////////////////////////////////////////////////////////////////////
+scoped_timer::scoped_timer (level_t _level,
+                            std::string &&_message):
+    m_level (_level),
+    m_message (_message),
+    m_start (util::nanoseconds ())
+{ ; }
+
+
+//-----------------------------------------------------------------------------
+scoped_timer::~scoped_timer ()
+{
+    auto finish = util::nanoseconds ();
+    auto duration = finish - m_start;
+
+    log (m_level, "%fs, %s", duration / 1'000'000'000.f, m_message);
+}
diff --git a/log.hpp b/log.hpp
index 7f32602a..037f09ef 100644
--- a/log.hpp
+++ b/log.hpp
@@ -87,6 +87,18 @@ namespace util {
         std::string m_message;
     };
 
+
+    ///////////////////////////////////////////////////////////////////////////
+    class scoped_timer : public nocopy {
+    public:
+        scoped_timer (const level_t, std::string&&);
+        ~scoped_timer ();
+
+    private:
+        const level_t m_level;
+        const std::string m_message;
+        uint64_t m_start;
+    };
 }
 
 #include "log.ipp"