A simple example of a function wrapper in c++

timeWrapperCpp.cpp

#include <iostream>
#include <chrono>
#include <cmath>

using namespace std;
using namespace std::chrono;

string func1(const string &nome) {
    int someVar = 1;
    for (int i = 0; i < 1e7; i++) {
        someVar *= i * i;
    }
    return nome + "_func1";
}

float func2(int step) {
    float someAccum = 0.0;
    int size = 1e7;
    for (int i = 0; i < size; i++) {
        someAccum += pow(step, 2);
    }
    return someAccum / (float) size;
}

template<typename returnType, typename paramType>
returnType timeWrapper(paramType param, returnType func(paramType), int n = 100) {
    double meanTime, stdTime, timeVec[n], timeAccum=0.0;
    high_resolution_clock::time_point begin, end;
    returnType returnVar;

    for (int i = 0; i < n; i++) {
        begin = high_resolution_clock::now();

        returnVar = func(param);

        end = high_resolution_clock::now();
        timeVec[i] = duration_cast<duration<double>>(end - begin).count();
        timeAccum += timeVec[i];
    }
    // calc mean
    meanTime = timeAccum / n;

    // calc std
    for (int i = 0; i < n; i++) {
        stdTime = pow(timeVec[i] - meanTime, 2) / n;
    }
    stdTime = pow(stdTime, 0.5);

    cout << " | " << "time: " << meanTime << " +- " << stdTime << " sec" << endl;
    cout << "\treturn: " << returnVar << endl;
    return returnVar;
}

int main() {
    //execute 100 times func1 and measure time
    cout << "func1 (n=100)| ";
    timeWrapper<string, const string &>("Patrick_Rudgeri", func1);

    //execute 100 times func1 and measure time
    cout << "func2 (n=100)| ";
    timeWrapper<float, int>(15, func2);

    //execute 300 times func1 and measure time
    cout << "func2 (n=300)| ";
    timeWrapper<float, int>(15, func2, 300);
    return 0;
}