Use of delete

1.delete NULL; Is safe

stay C ++ Delete set to NULL What happens when the pointer of ？

thankfully , Nothing there? ！ delete Will check whether the pointer is NULL, If the object is found to be set to NULL, Then skip the deletion of the object .

2.delete Objects and object arrays

If delete-expression The value of the operand of is not a null pointer value , be delete-expression The destructor will be called for the object or array element to be deleted （ If there is ）. For arrays , Elements will be destroyed in descending order （ namely , According to the completion order of its constructor )

3. Specification code : delete p; p=NULL; // Prevent excessive memory release

#include<stdio.h>

int main()
{
    
	int *p = new int(10);
	delete p;

	return 0;
}

Reference resources :

https://blog.aggregatedintelligence.com/2009/04/can-you-delete-null-pointer.html

https://www.iteye.com/blog/rednaxelafx-372310