C / C++ / MFC

15-Jul-04 12:02

Here is the code:

#pragma once

class Model
{
public:
Model(void);
~Model(void);

private:
std::vector<std::pair<AcGeLineSeg2d, double> > lines;
};

I am using Visual Studio 2003.

The main problem is that I'll add #include <utility> and instantly I have 30 or more errors. Even more fascinating, if I remove #include <utility> it still gives those same messages! It would be nice if I could get it to compile "std::vector<std::pair<AcGeLineSeg2d, double> > lines;" without an error. It gives error C2143: syntax error : missing ';' before '<'.

Thanks for your consideration,
Sean

vmaltsev15-Jul-04 12:30

vmaltsev

15-Jul-04 12:30

Did you try to #include "vector"? Smile | :)

zlatnik15-Jul-04 12:37

15-Jul-04 12:37

Yes I had tried that- I've tried a lot of things. That works for getting rid of compile errors on that particular line, but does nothing with the xutility errors...

vmaltsev15-Jul-04 12:41

vmaltsev

15-Jul-04 12:41

Could you please post operators definitions here if you have any?
[UPDATE]
I meant your AcGeLineSeg2d of course.

zlatnik15-Jul-04 12:47

15-Jul-04 12:47

There aren't any operators defined.

In fact, my code is as simple as it gets. What is even weirder is that the xutility errors showed up in a new project that doesn't even use pair or even any header files, aside from #include "vector" (which should really be "class vector;", but that is something altogether different).

Found solution: code compiles fine in VC++ 6.0

vmaltsev15-Jul-04 12:57

vmaltsev

15-Jul-04 12:57

Wait a second...
You're using STL right? So you have to include STL classes headers (like include "vector", cuz vector is a member of STL) and suggested forward declaration "class vector" will give you nothing but an error. What to xutility error, check your code carefully for dummy errors. All I've ever got from xutility is some warnings.

zlatnik16-Jul-04 9:38

Classes which call each other's methods

16-Jul-04 9:38

With very little work, I got the code to work in 6.0. For that reason, I will momentarily stop using .NET 2003 until absolutely necessary.

Thanks for your time!
Sean

0v3rloader15-Jul-04 11:28

0v3rloader

15-Jul-04 11:28

Hi there,

I have this problem with two classes which need to access each other's methods. Allow me to exemplify:

<br />
class CBaseClass<br />
{<br />
   public:<br />
      CDerivedClass *pDerived;<br />
      .<br />
      :<br />
      .<br />
};<br />
<br />
class CDerivedClass<br />
{<br />
public:<br />
   CDerivedClass()<br />
   {<br />
      CBaseClass *pBaseClass;<br />
      .<br />
      :<br />
      .<br />
   };<br />
      .<br />
      :<br />
      .<br />
};<br />

Now, as you may have guessed by now, I can't compile this as the compiler doesn't recognise CDerivedClass (it is declared after CBaseClass...).

I know this can be solved -- I just don't know how. Could you please give me a hand?

That would be much appreciated.

David

Antti Keskinen15-Jul-04 11:44

Antti Keskinen

15-Jul-04 11:44

Use a declaration or move the CDerivedClass definition above CBaseClass'.

Example:

class CDerivedClass;<DIV>

class CBaseClass
{
public:
   CDerivedClass* pDerived;
   .
   .
   .

This works. It's the same thing as using function declarations, e.g. header files, etc.. If you forget to write the CDerivedClass definition now, you'll get a linker error.

-Antti Keskinen

----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.

0v3rloader15-Jul-04 11:53

0v3rloader

15-Jul-04 11:53

Thanks Antti, once again.
I did exactly like you said (which is very logical, now that I think about it), but it isn't working yet. This time I get different compiling errors:

m:\~alibrary\projects\vc++\xig1\v2.0\xig1view.h(27) : error C2027: use of undefined type 'CXiG1View'<br />
        m:\~alibrary\projects\vc++\xig1\v2.0\xig1view.h(15) : see declaration of 'CXiG1View'<br />
m:\~alibrary\projects\vc++\xig1\v2.0\xig1view.h(27) : error C2065: 'classCXiG1View' : undeclared identifier<br />
m:\~alibrary\projects\vc++\xig1\v2.0\xig1view.h(35) : error C2027: use of undefined type 'CXiG1View'<br />
        m:\~alibrary\projects\vc++\xig1\v2.0\xig1view.h(15) : see declaration of 'CXiG1View'<br />
m:\~alibrary\projects\vc++\xig1\v2.0\xig1view.h(35) : error C2227: left of '->pConsole' must point to class/struct/union<br />
m:\~alibrary\projects\vc++\xig1\v2.0\xig1view.h(35) : error C2227: left of '->Output' must point to class/struct/union

By the way:

CXiGView is a CFormView (and has a CPrompt object)
CPrompt is declared before CXiG1View (and is a custom control derived class)

I declared the classes in the following way now:

class CXiG1View;


class CPrompt : public CXCommandPrompt
{
public:
	CPrompt()
	{
		CWnd *pParent;
	.
	:
	.
};

class CXiG1View : public CFormView
{
	.
	:
	.

What am I missing out here?

Antti Keskinen15-Jul-04 12:04

Antti Keskinen

15-Jul-04 12:04

There seems to be nothing wrong with the declaration you posted. Perhaps there's a typo or a syntax error (missing semicolon or something) somewhere else in your file ? I would check the lines that the compiler is suggesting, and the lines above/below them for typos/errors.

Unfortunately I can't find the error for you, you just need to go through the file with a magnifying glass.

To avoid similar problems in the future, I would suggest you (or your company, whichever) to familiarize yourselves with the excellent "Visual Assist X" tool from Whole Tomato Software. It simplifies and helps coding. And A LOT that is Smile | :)

For a quick link, go here.

-Antti Keskinen

----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.