Hi All,

I try to convert some C++ source to FPC, see below a short example from it. How can I define same operator with FPC trunk?

class Cla
{

     INT64   Num;

public:
Cla operator +(const Cla& m)
{

         Cla  ret(this);

         ret.Num += m.Num;
         return ret;
     }

Gabor

Depending on the usecase of that class it might be better to declare it as a record, then you can declare the operator as an operator in Pascal as well (in C++ class and struct are rather interchangeable with the main difference being the default visibility (private for class and public for struct)):

=== code begin ===

// interface section
type
   Cla = record
     Num: Int64;
     class operator + (const aLeft, aRight: Cla): Cla;
   end;
// implementation section
class operator Cla.+(const aLeft, aRight: Cla): Cla;
begin
   Result := Default(Cla);
   Result.Num := aLeft.Num + aRight.Num;
end;

=== code end ===

Otherwise you need to declare a global operator overload (which will not work with generics):

=== code begin ===

// in interface section
operator + (aLeft, aRight: TCla): TCla;
// in implementation section
operator +(aLeft, aRight: TCla): TCla;
begin
   Result := TCla.Create;
   Result.Num := aLeft.Num + aRight.Num;
end;

=== code end ===

Please note that in both cases the operators in Pascal are static functions, not member methods.

Regards,
Sven