如何調用銷毀功能？

Question

#include<iostream>
using namespace std;
class Monster {

  public: 
  Monster() {cout << "with out argument. \n";}
  Monster(int sz) { cout << "Monster created.\n"; }
  ~Monster() { cout << "Monster destroyed.\n"; }

  int GetSize() { return itsSize; }
  void SetSize(int str) { itsSize = str; }

private:
  int itsSize;
};

int main()
{
  Monster *m;
  m =new Monster[3];
  for(int i = 0; i < 3; i++)
     m[i] = i; // constructor with argument is getting called for each elements after which why destructor is getting called for each element.          
  delete []m;
  return 0;
}

Output:
with out argument. 
with out argument. 
with out argument. 
Monster created. // Monster constructor with argument is getting called.
Monster destroyed. // 1. Why this destructor is getting called after each call of constructor.
Monster created.
Monster destroyed. //2.
Monster created.
Monster destroyed. //3.
Monster destroyed.
Monster destroyed.
Monster destroyed.

當我使用值初始化Monster對象的Array時，將調用參數化的構造函數，此后為何立即調用析構函數？

Answer 1

m =new Monster[3];

在這里創建了三個對象，為每個對象調用了默認構造函數。 這就是為什么您看到with out argument.消息的原因with out argument.

m[i] = i;

首先，使用Monster(int)構造函數在右側創建臨時Monster。 這就是為什么您看到消息Monster created.的原因Monster created. 接下來，調用賦值運算符。 接下來，您的臨時怪物被刪除。 這就是為什么您看到Monster destroyed.的原因Monster destroyed. 。

delete []m;

陣列中的三個怪物被摧毀。

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