#include <iostream>
#include <cstdlib>
#include <iostream>
#include <chrono>
#include <vector>
class C{
	public: float hello;  
    public: float hello2s[10];  
    public: C(){
        hello=((double) rand() / (RAND_MAX))*10;
        for(int n=0;n<10;n++){
        	hello2s[n]= ((double) rand() / (RAND_MAX))*10;
        }
    }
    public: float calculateCheap(){
        return hello;
    }
    public: float calculateExpensive(){
    	float result=1;
    	result=hello2s[0]*hello2s[1]*hello2s[2]*hello2s[3]*hello2s[4];
        return result;
    }
};
int main(){
    const int numTest=10000;
    C  d[numTest];
    C* e[numTest];
    for(int n=0;n<numTest;n++){
        d[n]=C();
        e[n]=new C();
    }
    float accu=0;
    auto t1= std::chrono::system_clock::now();
    for(int n=0;n<numTest;n++){
        accu+=d[n].calculateExpensive();  //direct call
    }
    auto t2= std::chrono::system_clock::now();
    for(int n=0;n<numTest;n++){
        accu+=e[n]->calculateCheap();     //indirect call
    }
    auto t3= std::chrono::system_clock::now();
    std::cout<<"direct call time ="<<(t2-t1).count()<<std::endl;
    std::cout<<"indirect call time ="<<(t3-t2).count()<<std::endl;
    std::cout<<"print to disable compiler cheat="<<accu<<std::endl;
}