Confusing code

[gareth]

Hello all,

I've done C before but no C++. I'm looking at the example BHO at:
http://www.adp-gmbh.ch/win/com/bho.html and I'm a bit confused by some
of the code:

1. class BHO class adpbho : public IObjectWithSite , public IDispatch
{

Why are there two class declarations?

2. adpbho(unsigned long cookie) : m(1), webBrowser_(0),
connectionPoint Container(0), cookie_(cookie) , document_(0) {};

I thought : was used to show the class implemented an interface.
What's it doing in the above line??

Thanks

gareth

[Gavin Deane]

Re: Confusing code

On 19 Feb, 14:31, "gareth" <garethricharda d...@gmail.comw rote:

Hello all,
>
I've done C before but no C++. I'm looking at the example BHO at:http://www.adp-gmbh.ch/win/com/bho.htmland I'm a bit confused by some
of the code:
>
1. class BHO class adpbho : public IObjectWithSite , public IDispatch
{
>
Why are there two class declarations?

What is BHO? Is it a macro or something? Because I can't see any other
way that can be anything other than a syntax error.

2. adpbho(unsigned long cookie) : m(1), webBrowser_(0),
connectionPoint Container(0), cookie_(cookie) , document_(0) {};

That's a member initialisation list - the preferred way to initialise
bases and members in a constructor.

http://www.parashift.com/c++-faq-lite/ctors.html#faq-10.6

Gavin Deane

[Chris]

Re: Confusing code

gareth wrote:

1. class BHO class adpbho : public IObjectWithSite , public IDispatch
{
>
Why are there two class declarations?

According to the site, this is code for a Windows DLL? My guess is that this
isn't standard C++. Perhaps it's .NET Managed C++? MS is famous for
altering standards in order to lock users into their products (aka. vendor
lock-in).

--
Chris

[gareth]

Re: Confusing code

On 19 Feb, 15:29, Chris <c...@thisisnot anemailaddress. cawrote:

gareth wrote:

1. class BHO class adpbho : public IObjectWithSite , public IDispatch
{

>

Why are there two class declarations?

>
According to the site, this is code for a Windows DLL? My guess is that this
isn't standard C++. Perhaps it's .NET Managed C++? MS is famous for
altering standards in order to lock users into their products (aka. vendor
lock-in).
>
--
Chris

There's a lot in there that seems to cause problems, even in VS.NET
2003. I think that maybe this isn't proper code, more part pseudo code
or maybe part of a larger project including a lot of macros (like #B,
MB1)

Thanks for your help

Gareth

[John Harrison]

Re: Confusing code

gareth wrote:

Hello all,
>
I've done C before but no C++. I'm looking at the example BHO at:
http://www.adp-gmbh.ch/win/com/bho.html and I'm a bit confused by some
of the code:
>
1. class BHO class adpbho : public IObjectWithSite , public IDispatch
{
>
Why are there two class declarations?

I think it is just a mistake. Judging by the rest of the code the class
is called adpbho.

>
2. adpbho(unsigned long cookie) : m(1), webBrowser_(0),
connectionPoint Container(0), cookie_(cookie) , document_(0) {};
>
I thought : was used to show the class implemented an interface.
What's it doing in the above line??

You thought wrong. The : (in this case) introduces an initialiser list,
i.e. a list of base classes and data members that are being initialised
when the constructor executes.

john