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Problem with overloaded operators...

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Hi @all, I guess for most of you my problem isn''t a problem at all... but look... I''ve got a class like this :
class StringClass
public :

StringClass operator+(StringClass *CString);
StringClass operator+=(StringClass *CString);

//add some stuff here

I''d like to have both operators, + and += in my class, because it would make it much easier for me to work with those Strings. Because the += operator is very similar to the + operator, I tried to use the + operator in my += operator''s function instead of copying all the code.
StringClass operator+(StringClass *CString)
 StringClass CNewString;
 //plz imagine a huge piece of code here

 return CNewString;

StringClass operator+=(StringClass *CString)
 StringClass CNewString;
 CNewString = this + CString; //doesn''t work... :(

 return CNewString;
But, somehow it doesn''t work! My compiler tells me that there''s no global binary operator "+" defined... how can I make this one work?

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