C / C++ / MFC

Re: Message handled in the parent class (the one inherited from) without redirectioning it manually?

5-Jan-08 2:29

Joan Murt wrote:
When you have two classes and one of them inherits from the first one [CB inherits from CA], you can use functions in the parent class [CA] by setting them as virtual and protected or public from the child class [CB].

Well if your inherited class overrides base class virtual functions, the base ones will NOT be called implicitely.

Joan Murt wrote:
I would like to know if I can do the same with Windows messages.

You have to do it explicitely.

Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

[my articles]

Joan M5-Jan-08 5:06

Joan M

5-Jan-08 5:06

I've searched for that on the Internet and not found anything and thought to ask for it here but without a lot of hope...

Anyhow this is not a lot of job so it's OK.

Thank you CPallini.

bad_alloc

George_George4-Jan-08 23:08

4-Jan-08 23:08

Hello everyone,

I am wondering except when there is no memory on heap, are there any other situations when we will get bad_alloc exceptions? For example, invalid input of the size (e.g. very huge number or zero or negative number) will cause exception?

thanks in advance,
George

CPallini5-Jan-08 0:19

5-Jan-08 0:19

MSDN http://msdn2.microsoft.com/en-us/library/6512dwes(VS.71).aspx[^] is a bit laconic about, but seems to go on the way you depicted. BTW, Why don't you make a little test and tell us your findings?
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

[my articles]

George_George5-Jan-08 2:32

5-Jan-08 2:32

Hi CPallini,

It seems bad_alloc only occurs when there is no memory or not enough memory (as showed in the sample). And we can not input invalid value, like -1, compiler will fail. Do you agree with me?

BTW: what situations do you find you met with bad_alloc?

regards,
George

CPallini5-Jan-08 4:06

5-Jan-08 4:06

George_George wrote:
It seems bad_alloc only occurs when there is no memory or not enough memory (as showed in the sample).

Maybe, see the following lines.

George_George wrote:
And we can not input invalid value, like -1, compiler will fail. Do you agree with me?

Well, a negative integer is casted to a size_t one, that is an unsigned one, since -1 turns out to a very big unsigned value (4294967295), the compiler is able to detect the error. But a silly trick like the following

int *p;
int a=1;
int b=rand()> RAND_MAX / 2 ? 1 : 2;
try {
  p= new int[-a*b];
}
catch(...)
{
  printf("Exception, George!\n");
}

makes the compiler happy but an the exception is thrown at run-time.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

[my articles]

George_George5-Jan-08 4:20

5-Jan-08 4:20

Thanks CPallini,

Cool!

regards,
George

Hamid_RT5-Jan-08 18:07

5-Jan-08 18:07

Did you check when you want to allocate memory?

George_George6-Jan-08 2:30

6-Jan-08 2:30

Thanks Hamid,

What do you mean check? Check what?

regards,
George

Hamid_RT6-Jan-08 5:16

6-Jan-08 5:16

When you want to allocate dynamic memory did you check for example use of try/catch?

George_George6-Jan-08 20:43

6-Jan-08 20:43

Hi Hamid,

Which example do you mean? URL please?

regards,
George

Hamid_RT6-Jan-08 21:10

6-Jan-08 21:10

No I said for example use of try/catch not Example. Blush | :O

George_George6-Jan-08 21:15

6-Jan-08 21:15

Hi Hamid,

I am confused, which sample do you mean? If you mean anything of this forum, could you provide a link please?

regards,
George

Hamid_RT7-Jan-08 5:26

how to set inlude of option?

7-Jan-08 5:26

No I said (for example) not a example.dont worry Wink | ;)

gentleguy4-Jan-08 22:36

gentleguy

4-Jan-08 22:36

dear all

how to set path in setting of option? anyone has experience or some detail to introduce this? thanks a lot.

Li Zhiyuan

5/1/2008

toxcct4-Jan-08 23:36

toxcct

4-Jan-08 23:36

What are you talking about ?

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Off-topic

CPallini5-Jan-08 0:15

5-Jan-08 0:15

Hey Tox, was you on vacation, wasn't you?
Happy New Year and best wishes.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

[my articles]

Re: Off-topic

toxcct5-Jan-08 7:25

toxcct

5-Jan-08 7:25

yup, and to be fully exact, I'm still on vacation.

I was off from Codeproject because I went to Lithuania for the new year Smile | :)

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

CPallini5-Jan-08 0:11

5-Jan-08 0:11

Do you mean additional search paths for include files?
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

[my articles]

gentleguy5-Jan-08 1:17

gentleguy

5-Jan-08 1:17

yes, you are right, when we go to tool-> option, we can see executable file..but we also can choose include file, how to set the path there? i encountered a problem, after compilation,output showed me:

fatal error C1083: Cannot open include file: 'Centroids.h': No such file or directory

so i dun know how to set this path.

thanks

Li Zhiyuan

5/10/2006

CPallini5-Jan-08 1:30