Hi,
for the QT/C++ question... please refer to www.qtforum.org.
Thank You.
Teddy
On Thu, 3 Feb 2005 22:22:25 -0500, Mike Adolf <[EMAIL PROTECTED]> wrote:
> I am relatively new at C++/QT and I can't get the following to compile.
>
> Note the declaration of the operator<< overload in class Employee. If instead
> I put the implementation here, it compiles. But if the impmentation is
> placed outside of the class declaration as is done below, I get the following
> errors: (errors point to the implementation code)
>
> (1) QDataStream& Employee::operator<<(QDataStream&, const Employee&)' must
> take exactly one argument
> (2) `QDataStream& Employee::operator<<(QDataStream&, const Employee&)' member
> function declared in class `Employee'
>
> What's wrong with the implementation? It's driving me nuts.
>
> ****************
> #include <iostream>
> #include <qstring.h>
> #include <qvaluelist.h>
> #include <qdatastream.h>
> #include <qfile.h>
>
> class Employee
> {
> // DECLARATION
> friend QDataStream& operator<<(QDataStream &, const Employee &);
>
> public:
> Employee(): sn(0) {}
> Employee( const QString & forename, const QString & surname, int
> salary )
> : fn(forename), sn(surname), sal(salary)
> {}
>
> QString forename() const { return fn; }
> QString surname() const { return sn; }
> int salary() const { return sal; }
> void setSalary( int salary ) { sal = salary; }
> private:
> QString fn;
> QString sn;
> int sal;
> };
>
> // IMPLEMENTATION
> QDataStream& Employee :: operator<<(QDataStream &out, const Employee &emp) {
> out << emp.surname() << emp.forename() << emp.salary();
> return out;
> }
>
> int main ()
> {
> typedef QValueList<Employee> EmployeeList;
> EmployeeList list;
>
> list.append( Employee("John", "Doe", 50000) );
> list.append( Employee("Jane", "Williams", 80000) );
> list.append( Employee("Tom", "Jones", 60000) );
>
> Employee mary( "Mary", "Hawthorne", 90000 );
> list.append( mary );
> mary.setSalary( 100000 );
>
> QFile file("test.out");
> file.open(IO_WriteOnly);
> QDataStream out(&file);
> out.setVersion(5);
> out << (Q_UINT32) 0x98c58f26;
>
> EmployeeList::iterator it;
> for ( it = list.begin(); it != list.end(); ++it )
> out << *it;
> //out << (*it).surname() << ", " <<
> //(*it).forename()<< " earns " <<
> //(*it).salary() <<"\n";
> file.close();
>
> return 0L;
> }
>
>
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