小编Wie*_*ndK的帖子

我编写了一个简单的程序,可以在标准库容器中就地创建对象.这就是我写的:

#include <vector>
#include <iostream>

class AB
{
public:
   explicit AB(int n);
   AB(const AB& other) = delete;
   AB(AB&& other);
   AB& operator=(const AB& other) = delete;
   AB& operator=(AB&& other) = default;
private:
   int i;
};

AB::AB(int n): i( n )
{
   std::cout << "Object created." << std::endl;
};

AB::AB(AB&& other): i( std::move(other.i) )
{
   std::cout << "Object moved." << std::endl;
};

int main()
{
   std::vector< AB > v;
   v.emplace_back(1);
   v.emplace_back(2);
   v.emplace_back(3);
};

我用g ++(版本4.8.2)编译它.运行输出后,我得到:

Object created.
Object created.
Object moved.
Object …