相关疑难解决方法(0)

我有这个代码:

class Class {
public:
    virtual void first() {};
    virtual void second() {};
};

Class* object = new Class();
object->first();
object->second();
delete object;

用Visual C++ 10和/ O2编译并进行反汇编:

282:    Class* object = new Class();
00403953  push        4  
00403955  call        dword ptr [__imp_operator new (4050BCh)]  
0040395B  add         esp,4  
0040395E  test        eax,eax  
00403960  je          wmain+1Ch (40396Ch)  
00403962  mov         dword ptr [eax],offset Class::`vftable' (4056A4h)  
00403968  mov         esi,eax  
0040396A  jmp         wmain+1Eh (40396Eh)  
0040396C  xor         esi,esi  
283:    object->first();
0040396E  mov         eax,dword ptr [esi]  
00403970  mov         edx,dword …

假设我有一个这样的类:

#include <new>
struct thing {
  thing() = default;
  void foo()
  {
    this->~thing();
    new (this) thing();
  }
};

是这样调用析构函数然后使用放置新定义的行为重建对象？