make "new" object

**Hunter_wow** · 10-05-2007

Hello. I´m trying to make a new object into my main():

Code:

objectName name = new objectName();

Where "objectName" is a class into my Header file.
But I´m reciving the error:

error C2440: 'initializing' : cannot convert from 'objectName *' to 'objectName'
No constructor could take the source type, or constructor overload resolution was ambiguous

Any idea what I have missed? I´m not very familiar with pointers.

**laserlight** · 10-05-2007

Coming from say, Java, are you?

Just use:

Code:

objectName name;

With new you get a pointer and use dynamic memory allocation, but it appears that you have not learnt about pointers yet and probably do not need dynamic memory allocation here.

**Hunter_wow** · 10-05-2007

Thanks. I will try to make it without "new" then. But this raise other errors.
I want to put my "className name;" into a vector created/declare into my Header file like this:

Code:

static vector<className*> vname;

and into my main():

Code:

className::vname.push_back(name);

But this gives me the error:

error: cannot convert from 'className' to 'className *const '

Seems like a pointer problem again =(. Any ideas?

**matsp** · 10-05-2007

Yes, you can either store the actual object, or an address to the object in the vector. There are good reasons for doing either, it depends very much on what you actually plan on doing with the content of the vector (and how you create your data).

In the simple case presented here, I'd say "use className" instead of "className *" for the template of your vector. The alternative is to add a * to your name in main and change the line back to have a "new" in it.

--
Mats

**Hunter_wow** · 10-05-2007

Thanks a lot matsp. I removed the pointer and "new". But now I would like to run a method who is located into the source file of the Header file.

Code:

className::vname[0].methodName();

But getting the strange error:

main.obj : error LNK2001: unresolved external symbol "public: static class std::vector<class className,class std::allocator<class className> > className::vname" (?vname@className@@2V?$vector@VclassName@@V?$alloc ator@VclassName@@@std@@@std@@A)
.\Debug/OpenGL_Lab.exe : fatal error LNK1120: 1 unresolved externals

any clue why I´m getting this? Dont understand the error at all.

**matsp** · 10-05-2007

Sorry, but that I can't answer.

--
Mats

**MacGyver** · 10-05-2007

Maybe it's not a static function.... lol...

/me shrugs.

**matsp** · 10-05-2007

Hmm. What does your header file look like. Is the vector declared inside className?

If at all possible, post the headerfile (or if it's really large, the portions where your className and vector parts are declared.

--
Mats

**anon** · 10-05-2007

If it is a static member of the class, it needs to be defined (or is it initialized) somewhere. So, an implementation file would need this line:

Code:

vector<className> ClassName::vname;

**matsp** · 10-05-2007

Originally Posted by anon

If it is a static member of the class, it needs to be defined (or is it initialized) somewhere. So, an implementation file would need this line:

Code:

vector<className> ClassName::vname;

Pretty obvious, really! Didn't see the static part...

--
Mats

Thread: make "new" object

Thread Tools

Search Thread

Display

make "new" object

Similar Threads

trying to make a KenGen ( for a game tool )

Reviving my old scripting language.

A question about constructors...

Win32 Thread Object Model Revisted

How would you do this (object interlinking)