[Qt-interest] Small problem with QMap

[Benjamin Sonnemann]

You have to instantiate the static member somewhere.
Most probably you wnat this in your cpp file:

QMap<QString, MainMenuI *> Sample::items;

just put it on the top if you want the default constructor.

Benjamin Sonnemann


On Wed, Mar 11, 2009 at 4:11 PM, Juan D Guzman <lostinthecode at googlemail.com
> wrote:

> Ok so I am still trying to learn the ropes in C++ coming from a C#
> background.  I have the following code
>
> class Sample
>
> {
>
> public:
>
>    Sample()
>
>    {
>
>    }
>
>    ~Sample()
>
>    {
>
>    }
>
>    static void addItem(QString key, MainMenuI *iMenu);
>
> private:
>
>    static QMap<QString, MainMenuI *> items;
>
> };
>
>
> and in my cpp file i have the following
>
>
> void Sample::addItem(QString key, MainMenuI *iMenu)
> {
>    items.insert(key, iMenu);
>
> }
>
>
> when i try to compile though i get the following error:
>
>
> sample.obj:-1: error:  unresolved external symbol "private: static class
> QMap<class QString,class MainMenuI *> Sample::items"
> (?items at Sample@@0V?$QMap at VQString@@PAVMainMenuI@@@@A)
>
>
> any ideas?
>
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