forward_iterator_with_predicate and test_efficiency

gistfile1.cpp

#include "forward_iterator_with_predicate.hpp"

#include <vector>
#include <algorithm>
#include <iostream>

template <class Iter> 
void display(Iter& iter)
{
	for (auto i : iter) std::cout << i << " ";
	std::cout << "\n";
}

void test_efficiency()
{
	auto is_even = [](int i) {
		return (i & 0x1) == 0x0;
	};

	std::vector<int> xs = { 1, 2, 3, 4, 5, 6, 7, 8 };

	auto iwp = make_iterator_with_predicate(xs, is_even);

	std::vector<int> ys;
	ys.resize(4);

	std::copy(iwp.begin(), iwp.end(), ys.begin());
	
	display(ys);

	std::vector<int> zs;
	zs.resize(4);
	
	std::copy_if(xs.begin(), xs.end(), zs.begin(), is_even);

	display(zs);
}