C++ 拼接字符串

  append  to_string() 简单示例，拼接文件名

    int x =1, y=2;string filename("/data/");filename.append("map_");filename.append(std::to_string(x));filename.append("_");filename.append(std::to_string(y));filename.append(".txt");cout<<"filename = " << filename << endl;

输出结果为：filename = /data/map_1_2.txt

测试环境，ubuntu 16.04 , CMAKE_CXX_STANDARD 11