#include <filter.hpp>

#include <vector>

#include <iostream>

using iter::filter;

bool greater_than_four(int i) {

return i > 4;

}

class LessThanValue {

private:

int compare_val;

public:

LessThanValue() = delete;

LessThanValue(int v) : compare_val(v) { }

bool operator() (int i) {

return i < this->compare_val;

}

};

int main() {

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

std::cout << "Greater than 4 (function pointer)\n";

for (auto i : filter(greater_than_four, vec)) {

std::cout << i << '\n';

}

std::cout << "Less than 4 (lambda)\n";

for (auto i : filter([] (const int i) { return i < 4; }, vec)) {

std::cout << i << '\n';

}

LessThanValue lv(4);

std::cout << "Less than 4 (callable object)\n";

for (auto i : filter(lv, vec)) {

std::cout << i << '\n';

}

return 0;

}