«

Hello!

Is it possible to put the body below which is the instansiating of Test in
the initialize list in some way.

CEx07aView::CEx07aView()
{
m_pDlg = new Test(this);
}

//Tony

* Tony Johansson:
>
> Is it possible to put the body below which is the instansiating of Test in
> the initialize list in some way.
>
> CEx07aView::CEx07aView()
> {
> m_pDlg = new Test(this);
> }

You have asked a lot of such homework questions earlier.

Please consult your textbook.

Cheers.

--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?

Tony Johansson wrote:
> Hello!
>
> Is it possible to put the body below which is the instansiating of Test in
> the initialize list in some way.
>
> CEx07aView::CEx07aView()
> {
> m_pDlg = new Test(this);
> }
>

Simple

CEx07aView::CEx07aView() : m_pDlg(new Test(this))
{
}

But some compilers might give you warnings with this code. This is
because you are using 'this' before the object it is refering to has
been constructed, which is potentially a dangerous situation. I think I
would usually prefer this code

CEx07aView::CEx07aView() : m_pDlg(0)
{
m_pDlg = new Test(this);
}

The main difference between all three sets of code is what would happen
if new Test(this) threw an exception.

john

John Harrison wrote:

>> CEx07aView::CEx07aView()
>> {
>> m_pDlg = new Test(this);
>> }

....

> CEx07aView::CEx07aView() : m_pDlg(new Test(this))
> {
> }

....

> CEx07aView::CEx07aView() : m_pDlg(0)
> {
> m_pDlg = new Test(this);
> }
>
> The main difference between all three sets of code is what would happen
> if new Test(this) threw an exception.

How are they different in that regard?

* Rolf Magnus:
> John Harrison wrote:
>
> >> CEx07aView::CEx07aView()
> >> {
> >> m_pDlg = new Test(this);
> >> }
>
> ...
>
> > CEx07aView::CEx07aView() : m_pDlg(new Test(this))
> > {
> > }
>
> ...
>
> > CEx07aView::CEx07aView() : m_pDlg(0)
> > {
> > m_pDlg = new Test(this);
> > }
> >
> > The main difference between all three sets of code is what would happen
> > if new Test(this) threw an exception.
>
> How are they different in that regard?

Consider:

struct CEx07aView;

struct Test
{
Test( CEx07aView* ){ throw 666; }
};

struct FooBar
{
FooBar() { std::cout << "1\n"; }
~FooBar() { std::cout << "2\n"; }
};

struct CEx07aView
{
Test* m_pDlg;
FooBar foo;

...
};

--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?