#include <vector>
#include <string>
#include <iostream>

class student {
  public:
    std::string name;
    int age;

    student(const std::string & _name, const int & _age): name(_name), age(_age){}
};

int main()
{
  std::vector<student> student_vec;
  student_vec.emplace_back(student("mary", 15));
  student_vec.emplace_back(student("mike", 17));
  student_vec.emplace_back(student("tom", 16));
  std::vector<student> student_vec_move;
  std::cout << "student_vec" << std::endl;
  for (auto & s : student_vec)  //xxx
  {
      std::cout << s.name << "    " << s.age << "\t" << &s << std::endl;
      student_vec_move.emplace_back(std::move(s));
  }

  std::cout << "student_vec: after std::move" << std::endl;
  for (const auto & s : student_vec)
  {
      std::cout << s.name << "    " << s.age << "\t" << &s << std::endl;
  }

  std::cout << "student_vec_move" << std::endl;
  for (auto & s : student_vec_move)
  {
      std::cout << s.name << "    " << s.age << "\t" << &s << std::endl;
      s.name = s.name + "++";
  }

  std::cout << "student_vec_move: after modify" << std::endl;
  for (auto & s : student_vec_move)
  {
      std::cout << s.name << "    " << s.age << "\t" << &s << std::endl;
  }

  std::cout << "student_vec: after modify" << std::endl;
  for (const auto & s : student_vec)
  {
      std::cout << s.name << "    " << s.age << "\t" << &s << std::endl;
  }
}

運(yùn)行結(jié)果

student_vec
mary    15      0x25a70f0
mike    17      0x25a7100
tom     16      0x25a7110
student_vec: after std::move
        15      0x25a70f0
        17      0x25a7100
        16      0x25a7110
student_vec_move
mary    15      0x25a7140
mike    17      0x25a7150
tom     16      0x25a7160
student_vec_move: after modify
mary++  15      0x25a7140
mike++  17      0x25a7150
tom++   16      0x25a7160
student_vec: after modify
        15      0x25a70f0
        17      0x25a7100
        16      0x25a7110

說(shuō)明
1、使用std::move操作vector元素時(shí)驼鹅，原vector元素將不再可用榨馁，但原vector可以正常遍歷。因?yàn)閟td::move操作的是元素中的具體成員酝陈，而非元素整體床玻，所以新vector元素的地址與原vector元素是不同的
2、std::move只會(huì)操作class類(lèi)型的成員沉帮，而不會(huì)操作基本類(lèi)型锈死，示例中age成員仍得到保留
3贫堰、如果將“//xxx”行加個(gè)const改為

for (const auto & s : student_vec)  //xxx

則輸出為

student_vec
mary    15      0x217b0f0
mike    17      0x217b100
tom     16      0x217b110
student_vec: after std::move
mary    15      0x217b0f0
mike    17      0x217b100
tom     16      0x217b110
student_vec_move
mary    15      0x217b140
mike    17      0x217b150
tom     16      0x217b160
student_vec_move: after modify
mary++  15      0x217b140
mike++  17      0x217b150
tom++   16      0x217b160
student_vec: after modify
mary    15      0x217b0f0
mike    17      0x217b100
tom     16      0x217b110

說(shuō)明，std::move對(duì)vector元素的操作無(wú)效待牵，仍然調(diào)用了內(nèi)存拷貝