Peter,

AFAIK operator += or operator -= signature must contain a return value. In your case it can probably be void.

template<class U>
void operator+=(U offset)
{
...
}

...


Best Regards,
Ovanes

On Fri, Apr 25, 2008 at 10:41 AM, Peter <p.schregle@impuls-imaging.com> wrote:
Assuming I have a class like the following:

template <typename T>
struct point : boost::additive<point<T>, T>
{
   T x_;
   T y_;

   explicit point(T x=0, T y=0) : x_(x), y_(y)
   { }

   operator += (T offset)
   {
       x_ += offset;
       y_ += offset;
   }

   operator -= (T offset)
   {
       x_ -= offset;
       y_ -= offset;
   }
}

Now I want to change the addition and subtraction operators to allow for
different types using the following template

class point ...

   template <typename U>
   operator += (U offset)
   {
       x_ += offset;
       y_ += offset;
   }

   template <typename U>
   operator -= (T offset)
   {
       x_ -= offset;
       y_ -= offset;
   }

...

I cannot figure out how to write the proper syntax for the boost::additive
class, so that it generates the proper additional operators for all type
combinations. Is that possible, at all?

Thanks, Peter



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