C++ Primer（第5版） 练习 14.40

练习 14.40 重新编写10.3.2节（第349页）的biggies函数，使用函数对象类替换其中的lambda表达式。

环境：Linux Ubuntu（云服务器）

工具：vim

代码块

class CompareTwo{
	public:
	bool operator()(const string &a, const string &b){
		return a.size() < b.size();
	}
};

class CompareOne{
	public:
	CompareOne(vector<string>::size_type s): sz(s){}
	bool operator()(const string &a){
		return a.size() >= sz;
	}
	private:
		vector<string>::size_type sz;
};

class Output{
	public:
	bool operator()(const string &s){
		cout<<s<<" ";
	}
};

void biggies(vector<string> &words, vector<string>::size_type sz){
	elimDups(words);
	stable_sort(words.begin(), words.end(), CompareTwo());
	auto wc = find_if(words.begin(), words.end(), CompareOne(sz));
	auto count = words.end() - wc;
	cout<<count<<" "<<make_plural(count, "word", "s")<<" of length "<<sz<<" or longer"<<endl;
	for_each(wc, words.end(), Output());
	cout<<endl;
}