C++17
#include <stdio.h>
#include <memory>
class OK {
public:
  int value;
  OK(int x):value(x){
    printf("Constructor:%d\n",value);  
  }
  OK(const OK&) = delete;
  OK& operator= (const OK&) = delete;
  OK(OK&&) = delete;
  OK& operator=(OK&&) = delete;
  void doit() {
    printf("Hello World:%d", value);
  }
};

OK Get() {
    return OK(5);
}

int main()
{
    OK x(3), z(1);
    // OK y(x);                 // No Copy constructor
    // OK w(std::move(z));      // No move constructor
    // x=Get();                 // No assignment. If move is available, it will compile
    // x = std::move(z);        // No move assignment
    OK y=Get();
    y.doit();   // RVO without copy, assignment, move, move assignment
    return 0;
}
【 在 here080 的大作中提到: 】
: 啥也不用说了，上代码吧
:
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