stdFuncType.cpp

#include <iostream>
#include <functional>
#include <vector>
#include <algorithm>
using namespace std;

bool check(string &test) {
	return test.size() == 3;
}

class Check {
public:
	bool operator()(string &test) {
		return test.size() == 5;
	}
} check1;

void run(function<bool(string&)> check) {
	string test = "dog";
	cout << check(test) << endl;
}

int main() {
	
	int size = 5;
	
	vector<string> vec{"one", "two", "three"};
	
	auto lambda = [size](string test) {return test.size() == size;};
	
	int count = count_if(vec.begin(), vec.end(), [size](string test){ return test.size() == size;});
	cout << count << endl;
	
	count = count_if(vec.begin(), vec.end(), check);
	cout << count << endl;
	
	count = count_if(vec.begin(), vec.end(), check1);
	cout << count << endl;
	
	run(lambda);
	run(check1);
	run(check);
	
	function<int(int, int)> add = [](int one, int two){ return one+two };
	cout << add(7, 3) << endl;
	
	return 0;
}