Help adding objects

[Brian Dumas]

I would like to do something like the following

class TMyClass
{
......
}

TMyClass* mc1 = new TMyClass;
TMyClass* mc2 = new TMyClass;
TMyClass* mc3=mc1+mc2;

Where the addition mc1+mc2 would take the desired information from each
object, put them together , then store them mc3. I tried overloading the
operator+, but when I compile the mc3=mc1+mc2 line, the compiler complains
about invalid pointer addition.

Anyone have an ideas?

Thanks for any and all help. It is greatly appreciated.
Brian Dumas


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[Ravi]

Brian Dumas wrote:

I would like to do something like the following

class TMyClass
{
.....
}

TMyClass* mc1 = new TMyClass;
TMyClass* mc2 = new TMyClass;
TMyClass* mc3=mc1+mc2;

mc1 and mc2 are pointers and it makes no sense to add two pointers ever.

You could try

TMyClass* mc3 = new TMyClass(*mc1+*mc2);

where you overload the + operator suitably and define a copy constructor
if needed.

[Thomas Matthews]

Brian Dumas wrote:

I would like to do something like the following

class TMyClass
{
.....
}

TMyClass* mc1 = new TMyClass;
TMyClass* mc2 = new TMyClass;
TMyClass* mc3=mc1+mc2;

Where the addition mc1+mc2 would take the desired information from each
object, put them together , then store them mc3. I tried overloading the
operator+, but when I compile the mc3=mc1+mc2 line, the compiler complains
about invalid pointer addition.

Anyone have an ideas?

Thanks for any and all help. It is greatly appreciated.
Brian Dumas

In your example above, all the variables are pointers to
the classes, not instances of the classes. The compiler
is correct, because you are telling it to add pointers
together.

I think you meant:
TMyClass * mc3 = new TMyClass; // create an instance for the result.
*mc3 = *mc1 + *mc2; // Add the instances, not the pointers.

BTW, there is no requirement for classes to start with a 'T'
or a 'C'. Feel free to be different.

--
Thomas Matthews

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[David Harmon]

On Wed, 11 Feb 2004 11:30:09 -0800 in comp.lang.c++, "Brian Dumas"
<br***@kvdco.com> was alleged to have written:

operator+, but when I compile the mc3=mc1+mc2 line, the compiler complains
about invalid pointer addition.

Right. Stop using pointers. Stop using "new".
Put down that Java book and step away from it.