Trying to use * pointer operator to call class member function

Question

I'm a begginer in C++ and trying to create a new instance of a class

foo* a= new foo(1);
*(a).kCreateThread();

and I get the following error

error C2228: left of '.kCreateThread' must have class/struct/union

What is wrong?

`(*a).kCreateThread();`. Your syntax tries to call a.kCreateThread() and dereference the return value of it, while mine first dereferences the pointer a and then tries to call kCreateThread with it. This is because * has lower precedence then . — Creris, Oct 18 '14 at 10:32
[This operator precedence table might help.](http://en.cppreference.com/w/cpp/language/operator_precedence) — Some programmer dude, Oct 18 '14 at 10:38

score 3 · Accepted Answer · answered Oct 18 '14 at 10:34

3

What you wrote is equivalent to

*((a).kCreateThread());

You should use

a->kCreateThread();

or

(*a).kCreateThread();

These last two are equivalent.

answered Oct 18 '14 at 10:34

Alberto Santini

score 1 · Answer 2 · answered Oct 18 '14 at 10:37

1

Do it like this: a->kCreateThread();

answered Oct 18 '14 at 10:37

Mosa

2 Answers2