Do the parentheses after the type name make a difference with new?

Question

If \'Test\' is an ordinary class, is there any difference between:

Test* test = new Test;

and

Test* test = new Test();
         


        

Answer 1

In general we have default-initialization in first case and value-initialization in second case.

For example: in case with int (POD type):

• int* test = new int - we have any initialization and value of *test can be any.

• int* test = new int() - *test will have 0 value.

next behaviour depended from your type Test. We have defferent cases: Test have defult constructor, Test have generated default constructor, Test contain POD member, non POD member...