forbids declaration of QHash with no type

[nina1983]

ok....

I solve the problem including:

#include<QHash>
#include<QStringList>

#include<QHash>
#include<QStringList>

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but I have one more question...
Before I added "hash" and "hashName", I had only QString and QList object in my header file. Why I don't have to include this classes? It worked withouth the declaration

#include <QString>
#include <QList>

#include <QString>
#include <QList>

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Why QHash and QStringList need it?

Thanks

[caduel]

If you use a (any) Qt-class, in a header you usually need to include its header.

Exceptions are:
* if you only use a pointer or reference or return type, a forward declaration is enough.

class X
{
   QString s; // needs include
   QTreeView *tv; // forward decl "class QTreeView;" is enough
   QHash<QString,QList<int> > hash; // needs includes for QString, QList and QHash
   QString getName() const; // forward declaration enough
};

class X
{
   QString s; // needs include
   QTreeView *tv; // forward decl "class QTreeView;" is enough
   QHash<QString,QList<int> > hash; // needs includes for QString, QList and QHash
   QString getName() const; // forward declaration enough
};

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Sometimes you get away without including a header, namely if you include other headers that in turn include the header you would need.
Still, I consider it good practice to explicitly include any header of a class that is explicitly used in a class.

In your case: QStringList inherits QList. Therefore its header must include the QList-header. Thus you do not have to include it.
QString is part of QStringList as well.

HTH

[nina1983]

Great!

Now I understand!

Thank you so much!