Optimize chrono feature class replace with method

src/extra_features.h

@@ -42,23 +42,10 @@
 
 using namespace std;
 
-class Timer
+inline long long int getElapseTime(std::string marker = "")
 {
-    DISALLOW_COPY_AND_ASSIGN(Timer);
+    static std::unordered_map<std::string, std::chrono::high_resolution_clock::time_point> marker_times;
 
-public:
-    static Timer& getInstance()
-    {
-        static Timer instance;
-        return instance;
-    }
-
-    ~Timer()
-    {
-    }
-
-    long long int getElapseTime(std::string marker = "")
-    {
     auto current_time = std::chrono::high_resolution_clock::now();
     auto it = marker_times.find(marker);
     if (it != marker_times.end())
@@ -74,16 +61,8 @@ public:
     }
 }
 
-private:
-    Timer()
-    {
-    }
-    
-    std::unordered_map<std::string, std::chrono::high_resolution_clock::time_point> marker_times;
-};
-
-#define LAP_TIME(marker) Timer::getInstance().getElapseTime(marker)
-#define LOG_LAP_TIME(marker) { auto __d = Timer::getInstance().getElapseTime(marker); if(__d > 0) std::cout << "Execution time for " << marker << ": " << __d << std::endl; }
+#define LAP_TIME(marker) getElapseTime(marker)
+#define LOG_LAP_TIME(marker) { auto __d = getElapseTime(marker); if(__d > 0) std::cout << "Execution time for " << marker << ": " << __d << std::endl; }
 
 #else