C++ 判断vector中是否存在特定值的方法

        vector<int> vec;
        vec.push_back(1);
        vec.push_back(2);
        vec.push_back(3);
        vec.push_back(4);
        vec.push_back(5);

        vector<int>::iterator ret;
        ret = std::find(vec.begin(), vec.end(), 15);
        if(ret == vec.end())
            cout << "not find" << endl;
        else
            cout << "finded" << endl;