C++ delete syntax

Question

I came across this rather unusual usage of 'delete'. Just wanted to know if the following line deletes both pointers or only the first?

delete ptr1, ptr2 

Answer 1

This is undoubtedly an error. The comma here is the comma operator, not a separator. Only the first pointer, ptr1 is deleted.

The second pointer, ptr2, is just a do-nothing expression.

The delete operator has higher precedence than the , operator, so the expression is parsed as if it were written:

(delete ptr1) , (ptr2) 

and not as if it were written:

delete (ptr1 , ptr2) 

If , had higher precedence than delete, then only the second pointer would be deleted.