How to create a QList of QPointers?

[dobedidoo]

Hi

I'm trying to create a QList of QPointers, something like this:

QList<QPointer<someClass>>* myQPointerList_;

QList<QPointer<someClass>>* myQPointerList_;

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However, this syntax does not seem to be good. I get errors like:

1>d:\testproj\mainWindow.h(282) : error C2947: expecting '>' to terminate template-argument-list, found '<'
1>d:\testproj\mainWindow.h(282) : error C2143: syntax error : missing ';' before '>>'
1>d:\testproj\mainWindow.h(282) : error C2238: unexpected token(s) preceding ';'

I use the (Win32) MSVC 2005 compiler.

So, is there a way to handle this (that is, to create the QList of QPointers that I would like to use)?

[Lykurg]

put a space between the brackets:

QList<QPointer<someClass> > myQPointerList_;

QList<QPointer<someClass> > myQPointerList_;

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and allocate it on the stack, not on the heap.

[dobedidoo]

Well, I'm quite a beginner in C++/Qt, so I'm not sure I fully understand what that means - to "allocate it on the stack, not on the heap" . But, one thing is that I need this QList of QPointers to be accessible/recognized by several methods/"functions" in my main class, which is why I thought I needed to declare it in the header file.

If I just do

QList<QPointer<someQClass> > myQPointerList

QList<QPointer<someQClass> > myQPointerList

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in the constructor of my main class, then myQPointerList will not be "known" by the other methods/"functions" in my main class - right? Or am I wrong - maybe it can be?

[Lykurg]

Well, I'm quite a beginner in C++/Qt,

...then please use the Newbie section. We also read and answer thread there and know that the users aren't so good with C++/Qt. Then we answer in more detail.

so I'm not sure I fully understand what that means - to "allocate it on the stack, not on the heap".

I wrote that because you had an asterisk in your definition. So for you everything is fine if you use it like:

// header file
class MyClass
{
  //...
  private:
    QList<QPointer<someQClass> > myQPointerList;
}
 
// and in the implementation you can use it everywhere
 
void MyClass::someFunction()
{
  myQPointerList.append(new someQClass);
  // etc.
}

// header file
class MyClass
{
  //...
  private:
    QList<QPointer<someQClass> > myQPointerList;
}

// and in the implementation you can use it everywhere

void MyClass::someFunction()
{
  myQPointerList.append(new someQClass);
  // etc.
}

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[nish]

this not related to QList ... this is simple C++ concept... if your declare any variable in constructor then it is not possible to access this outside..

so make it a member of the class..

"allocate it on the stack, not on the heap" means
int a; <-- stack, a will die after its scope, that may be function or object
int * a = new int; <--heap // a will remain in memory until delete is called

EDIT: I m TOO late.