std::string 拼接字符串

#include <iostream>
#include <string>
#include <sstream>

int main()
{
    // 方法一：123456-==-
    std::string a = "123";
    std::string b = "456";
    std::string c;

    c.append(a).append(b).append("-==-");

    std::cout << c << std::endl;

    // 方法二：
    std::string a1 = "123";

    std::stringstream c1;
    c1 << 456 << "-==-";

    a1 += c1.str();

    std::cout << a1 << std::endl;
}