C / C++ / MFC

CPallini17-Dec-07 4:08

17-Dec-07 4:08

Programm3r wrote:
I would like to know wheter it is better to declare a structure in a class or in a global space with regards to memory usage?

Memory usage should be the same. Anyway, IMHO that isn't the point: nested structs are declared to avoid name collisions.
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.

Programm3r17-Dec-07 4:12

Programm3r

17-Dec-07 4:12

Thanks for you honest opinion Smile | :)

Regards,

The only programmers that are better that C programmers are those who code in 1's and 0's Green Alien | [Alien]

Programm3r
My Blog: ^_^

David Crow17-Dec-07 4:24

17-Dec-07 4:24

If the structure was declared globally, it would always exist on the stack. If it was declared within a class, it would only exist if an instance of the class also existed.

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

CPallini17-Dec-07 4:36

17-Dec-07 4:36

DavidCrow wrote:
If the structure was declared globally, it would always exist on the stack. If it was declared within a class, it would only exist if an instance of the class also existed.

The above is true for an instance of the struct not for the struct type itself.
Big Grin | :-D

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.

toxcct17-Dec-07 4:44

17-Dec-07 4:44

but a type itself doesn't exist in memory... only instances of this type.

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CPallini17-Dec-07 4:55

17-Dec-07 4:55

OK. But the OP, IMHO, refers to the struct type declaration (i.e. to the memory usage of the instances of either globally declared struct type or the class nested struct type).

BTW your sentence isn't completely true (missing static members? Wink | ;)

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.

toxcct17-Dec-07 5:00

17-Dec-07 5:00

CPallini wrote:
BTW your sentence isn't completely true (missing static members? ).

nope, my sentence is still valid. even statics are concerned.

for global statics, types don't exist in memory, only instances.

for static class members, same is true.

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modified on Monday, December 17, 2007 11:06:49 AM

CPallini17-Dec-07 5:14

17-Dec-07 5:14

Well this is a rather philosophic debate and technically I'm surely wrong... What I mean is that whenever you declare a static class member, you implicitely force that member instatiation hence memory usage without class instances around.
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.

David Crow17-Dec-07 5:00

17-Dec-07 5:00

Of course, but since the OP did not specify, I opted for the former since most folks asking such a question would not be able to differentiate between the two.

CPallini17-Dec-07 5:06

When I have compiled a Visual C++ 2008 program, what DLL's does the resulting .EXE file need, to run on another computer?

17-Dec-07 5:06

DavidCrow wrote:
ince most folks asking such a question would not be able to differentiate between the two

Uhm, I think you're right.
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.

Anthony Appleyard17-Dec-07 3:33

Re: When I have compiled a Visual C++ 2008 program, what DLL's does the resulting .EXE file need, to run on another computer?

17-Dec-07 3:33

I have the free download version of Visual C++ 2008.

I asked the above question recently, and was told to read http://msdn2.microsoft.com/en-us/library/zebw5zk9(VS.80).aspx . However, that page is for Visual C++ 2005, which uses different DLL's and mentions things that my Visual C++ 2008 does not have. So, please:

Which of the relevant Visual C++ 2008 DLL's do what and are needed for what?
Can they be merely put in the same directory/folder as the .EXE file, or do they have to be in a particular directory structure?

toxcct17-Dec-07 3:37

Re: When I have compiled a Visual C++ 2008 program, what DLL's does the resulting .EXE file need, to run on another computer?

17-Dec-07 3:37

run Dependency Walker[^] to figure that out

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Anthony Appleyard17-Dec-07 4:34

Re: When I have compiled a Visual C++ 2008 program, what DLL's does the resulting .EXE file need, to run on another computer?

17-Dec-07 4:34

Thanks.

I tried it: I installed it; I dragged typecase_vc.exe into it, and it made a massive list of names of DLL's.

I then tried it on typecase.exe, which was compiled on my old Borland C++ 4.5 compiler, and I know that it only needs a Borland DLL called CW3215.DLL to make it run on other computers; but for typecase.exe Dependency Walker also made a massive list of names of DLL's. Of those, the rest are presumably permanent Windows DLL's.

Please how do I tell Dependency Walker not to list DLL's which are in Windows?

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I compiled typecase_vc.exe under Windows Vista. When it is accompanied by the necessary DLL's, which versions of Windows would it run under?

toxcct17-Dec-07 4:40

Re: When I have compiled a Visual C++ 2008 program, what DLL's does the resulting .EXE file need, to run on another computer?

17-Dec-07 4:40

actually, Depends.exe returns every dependency... but most of the time, the DLLs needed are Windows DLL (so, no need to provide them once again).

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David Crow17-Dec-07 5:03

Re: When I have compiled a Visual C++ 2008 program, what DLL's does the resulting .EXE file need, to run on another computer?

17-Dec-07 5:03

toxcct wrote:
actually, Depends.exe returns every dependency...

There's no way for Depends.exe to know of DLLs that are linked explicitly.

led mike17-Dec-07 4:46

led mike

17-Dec-07 4:46

Anthony Appleyard wrote:
However, that page is for Visual C++ 2005, which uses different DLL's and mentions things that my Visual C++ 2008 does not have.

So read the page MSDN has that discusses deploying VS2008 applications which the other one you supposedly read has a link for. Roll eyes | :rolleyes:

Re: When I have compiled a Visual C++ 2008 program, what DLL's does the resulting .EXE file need, to run on another computer?

Anthony Appleyard17-Dec-07 5:16

Re: When I have compiled a Visual C++ 2008 program, what DLL's does the resulting .EXE file need, to run on another computer?

17-Dec-07 5:16

Thanks. On top right corner of the Determining Which DLLs to Redistribute" page, I found and followed a link to the "Determining Which DLLs to Redistribute" page for 2008, which lists these DLL's: atl90.dll (Active Template Library); msvcm90.dll msvcp90.dll msvcr90.dll (C Runtime and Standard C++ Libraries); mfc90.dll mfc90u.dll mfcm90.dll mfcm90u.dll mfcmifc90.dll . But of those, atl90.dll mfc90.dll mfc90u.dll mfcm90.dll mfcm90u.dll mfcmifc90.dll do not seem to be anywhere in my C:\Program Files\Microsoft Visual Studio 9.0\ directory tree.

That page says "This page is specific to Microsoft Visual Studio 2008/.NET Framework 3.5", but also "Redist.txt is located in the Program Files\Microsoft Visual Studio 2005 directory on the second Visual Studio 2005 product CD or on the DVD.". Please what is happening. I am sorry to take up so muc of your time.

David Crow17-Dec-07 5:30

Re: When I have compiled a Visual C++ 2008 program, what DLL's does the resulting .EXE file need, to run on another computer?

17-Dec-07 5:30

Anthony Appleyard wrote:
But of those, atl90.dll mfc90.dll mfc90u.dll mfcm90.dll mfcm90u.dll mfcmifc90.dll do not seem to be anywhere in my C:\Program Files\Microsoft Visual Studio 9.0\ directory tree.

But do they exist in your c:\windows\system32 folder?

Anthony Appleyard17-Dec-07 5:37

Re: When I have compiled a Visual C++ 2008 program, what DLL's does the resulting .EXE file need, to run on another computer?

17-Dec-07 5:37

They are not in my c:\windows\system32\ folder.

Mark Salsbery17-Dec-07 7:00

Mark Salsbery

17-Dec-07 7:00

They'll be in a subfolder of your Windows\winsxs folder.

Take a look at the manifest file generated by your project. There you can get the
version of the VC runtime DLLs your app is using. That will tell you which winsxs
folder to find the DLLs in.

You really need to study the deployment docs if you want to do anything beyond
just running the end-user redistributable installer on other machines.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: When I have compiled a Visual C++ 2008 program, what DLL's does the resulting .EXE file need, to run on another computer?

led mike17-Dec-07 6:17

led mike

17-Dec-07 6:17

Anthony Appleyard wrote:
do not seem to be anywhere in my C:\Program Files\Microsoft Visual Studio 9.0\ directory tree.

What difference does that make to your deployment problem?

Anthony Appleyard wrote:
Please what is happening.

I can't be sure. Maybe you are assuming that all you need to find is a magic list of files and you can take it from there. Deploying VS2008 C++ applications may not work as you assume.

Starting from that first page you posted the URL of you can follow links to many pages of information regarding deployment of a VS2008 VC++ application. I suggest you stop typing questions into forums and start reading the documentation.

Get lvalue through rvalue

George_George17-Dec-07 2:56

George_George

17-Dec-07 2:56

Hello everyone,

I do not know how in the following code, rvalue -- return of X(), could result in a lvalue finally and binded to a non-const reference input parameter of function f.

Any ideas?

struct X {


};

void f (X& x) {}

int main()
{
	f (X() = X());

	return 0;
}

thanks in advance,
George

Hey man

CPallini17-Dec-07 3:13