exercise10_22.cpp

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

using std::string;
using namespace std::placeholders;

bool isLesserThanOrEqualTo6(const string &s, string::size_type sz)
{
	return s.size() <= sz;
}

int main()
{
	std::vector<string> authors{ "1234567", "1234", "1234567890", "1234567", "12345" };
	std::cout << count_if(authors.cbegin(), authors.cend(), bind(isLesserThanOrEqualTo6, _1, 6)) << std::endl;
}