How to profile my code using my own class that measure time?

Question

So I working on a project and want to profile my code. I have been using KCachegrind to get general idea of what functions cost the most. But now I want to get the exact time spent on those particular functions. So I decided to measure them manually using clock_gettime using object oriented approach. ie. wrap clock_gettime function inside a class.

Lets say I want to create a class that handles the measurement of time

class measure_time{

    inline int start(){...}; // return ts_start 
    inline int end(){...};   // return ts_end

};

Then I use this class to measure time across the projects. When I am about to measure I have to create instance of measure_time per each classes of my project. ie: Lets say I have class A, class B, class C etc in my project.

// A.h
class A{
   void f();
   void f_1();
   measure_time mt;
}
// A.cpp
void A::f(){
    // does some work 
}

void A::f_1(){

    // measure time start
    s = mt.start();
    f()
    // measure time end
    e = mt.end();
    //record time
    time = s-e;

}

// B.h
class B{
   void g();
   void g_1();
   measure_time mt;
}
// B.cpp
void B::g(){
    // does some work
}

void B::g_1(){

     // measure time start
    s = mt.start();
    g()
    // measure time end
    e = mt.end();
    //record time
    time = s-e;

}

// C.h
class C{
   void h();
   void h_1();  
   measure_time mt;
}
//C.cpp
void C::h(){
    // does some work
}

void C::h_1(){

     // measure time start
    s = mt.start();
    h()
    // measure time end
    e = mt.end();
    //record time
    time = s-e;

}

By this approach I have to define 'measure_time' class in each of the class. So what I wanted was to define the measure_time class only once and use it across the class A, B and C.

Answer 1

t seems as if you're trying to use one timer to measure execution time across three objects? If that's what you're doing, your classes shouldn't know anything about that timer.

Set up a timer in another class, start it, execute your three objects, stop the timer, and see the result. An object should only have its own timer if it's responsible for timing itself.