test.cpp

#include <vector>
#include <algorithm>
#include <iostream>
#include <ctime>
#include <functional>

#define LOG(x) { std::cout << #x << " = " << (x) << "\n"; }
#define TIME(t) { std::cout << ((double)(clock() - (t)) / CLOCKS_PER_SEC) << " s\n"; }

volatile    unsigned long long out = 0;
   volatile unsigned long long out1 = 0;
   volatile unsigned long long out2 = 0;
    volatile unsigned long long out3 = 0;

void accumulate(unsigned long long number)
{
    for (unsigned long long i = 0; i < number; ++i)
		out += number;
}

void accumulate2(unsigned long long number)
{
    for (unsigned long long i = 0; i < number; ++i)
		out1 += number;
}

unsigned long long i1;
unsigned long long i2;

auto lamb1 = [=](unsigned long long number) {
    for (i1 = 0; i1 < number; ++i1)
		out2 += number;
};
auto lamb2 = [=](unsigned long long number) {
    for ( i2 = 0; i2 < number; ++i2)
		out3 += number;
};
typedef void (*sumptr)(unsigned long long);

template<typename Function>
inline void execute(unsigned long long size, Function func) {
	func(size);
}
int main(int argc, char** argv)
{
    const size_t MAX = 100; // number of tests
    const unsigned long long SIZE = strtoull(argv[1], NULL, 10); // length of the vector

    clock_t clk;

    std::cout << "iterator\n";


	sumptr functptr;
	std::function<void(unsigned long long)> func;
	std::function<void(unsigned long long)> bindfunc;

	if(argc > 2) {
		functptr = accumulate;
		func = lamb1;
		bindfunc = std::bind(&accumulate, std::placeholders::_1);
	} else {
		functptr = accumulate2;
		func = lamb2;
		bindfunc = std::bind(&accumulate2, std::placeholders::_1);
	}

    clk = clock();
    for (size_t i = 0; i < MAX; ++i)
		functptr(SIZE);
    TIME(clk)

    std::cout << "\nlambda\n";

    clk = clock();
    for (size_t i = 0; i < MAX; ++i)
		func(SIZE);
	/*if(argc > 2) {
		for (size_t i = 0; i < MAX; ++i)
			execute(SIZE, lamb1);
	} else {
		for (size_t i = 0; i < MAX; ++i)
			execute(SIZE, lamb2);
	}*/
    TIME(clk)

	std::cout<< out << std::endl;
	std::cout<< out1 << std::endl;
	std::cout<< out2 << std::endl;
	std::cout<< out3 << std::endl;

    std::cout << "\nbind\n";

	out = 0;
	out1 = 0;
    clk = clock();
    for (size_t i = 0; i < MAX; ++i)
		bindfunc(SIZE);
    TIME(clk)
	std::cout<< out << std::endl;
	std::cout<< out1 << std::endl;
    return 0;
}