to compare with https://gist.github.com/kmsquire/7403647

bench_arange.cpp

#include <iostream>
#include <string>
#include <ctime>

using namespace std;
 
double* func_cpp(double a, double inc, double b) {
	double* buff;
	for (auto i=0; i<1000; i++) {
		int len= (int)((b-a)/inc);
		buff = new double[len];
		double* bi= buff;
		for (auto v=a; v<b; v+=inc) {
			*bi = v; 
			bi++;
		}
		delete[] buff;
	}
	return buff;
}

const double N=3;
const double ITER=5;
int main( )
{
	clock_t min_dt;

	auto set= false;

	for (auto n=0; n<N; n++) {
		auto ti= clock();
		for (auto iter=0; iter<ITER; iter++)
			func_cpp(0,.1,10000);

		auto tf= clock();
		auto dt= tf-ti;
		if ((!set)||(dt < min_dt)) {
			min_dt = dt;
			set= true;
		}

	}
 
	cout << "ms : " << min_dt/ITER/CLOCKS_PER_SEC*1000.0 << endl;

	std::string name;
	std::getline (std::cin,name);
}