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POError with derived class using overloaded operator from base class
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5508996
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AcceptedAnswerId
5510128
AnswerCount
2
ClosedDate
CommentCount
7
CommunityOwnedDate
CreationDate
2011-04-01T03:58:53.163
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0
LastActivityDate
2011-04-01T07:24:44.217
LastEditDate
2011-04-01T04:11:13.350
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661601
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661601
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0
PostTypeId
1
Score
1
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741
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text
Body
I'll post my issue and then I'll have the code at the bottom. I have a base class (strSet) that has overloaded +,-,*,= operators. I have a derived class (extStrSet) that has overloaded <,>,== operators In the implementation of the overloaded '<' and '>' operators in the derived class, i have to use the '*' operator (from the base class). But I am getting an error that I'm really not sure why is happening. The errors say this: <pre><code>extstrset3.cpp: In member function âextStrSet extStrSet::operator>(const extStrSet&)â: extstrset3.cpp:17: error: no match for âoperator=â in âtemp = strSet::operator*(const strSet&)(((const strSet&)(&((const extStrSet*)rtSide)->extStrSet::<anonymous>)))â extstrset3.h:11: note: candidates are: extStrSet& extStrSet::operator=(const extStrSet&) extstrset3.cpp: In member function âextStrSet extStrSet::operator<(const extStrSet&)â: extstrset3.cpp:29: error: no match for âoperator=â in âtemp = strSet::operator*(const strSet&)(((const strSet&)(&((const extStrSet*)rtSide)->extStrSet::<anonymous>)))â extstrset3.h:11: note: candidates are: extStrSet& extStrSet::operator=(const extStrSet&) extstrset3.cpp:35: error: ânewSetâ was not declared in this scope extstrset3.cpp: In member function âextStrSet extStrSet::operator==(const extStrSet&)â: extstrset3.cpp:41: error: no match for âoperator=â in âtemp = strSet::operator*(const strSet&)(((const strSet&)(&((const extStrSet*)rtSide)->extStrSet::<anonymous>)))â extstrset3.h:11: note: candidates are: extStrSet& extStrSet::operator=(const extStrSet&) extstrset3.cpp:45: error: ânewSetâ was not declared in this scope </code></pre> NOTE: I am not to change either of the two header files. NOTE: I know for a fact that strSet.h and strSet.cpp are implemented correctly. NOTE: The overloaded '==' operator returns a extStrSet (string set) with "true" or "false" as its only string I should be able to use the * operator on extStrSet even though its overloaded for strSet, shouldn't I? I'm just starting inheritance so I'm still a bit wary of it. strSet.h <pre><code>#ifndef STRSET_H #define STRSET_H #include <iostream> #include <vector> #include <string> struct node { std::string s1; node * next; }; class strSet { protected: node * first; // This is initially empty (when constructed) bool isSorted () const; public: strSet (); // Create empty set strSet (std::string s); // Create singleton set strSet (const strSet &copy); // Copy constructor ~strSet (); // Destructor void nullify (); // Make a set be empty bool isNull () const; int SIZE() const; void output() const; bool isMember (std::string s) const; strSet operator + (const strSet& rtSide); // Union strSet operator * (const strSet& rtSide); // Intersection strSet operator - (const strSet& rtSide); // Set subtraction strSet& operator = (const strSet& rtSide); // Assignment }; // End of strSet class #endif </code></pre> extStrSet.h <pre><code>#ifndef EXTSTRSET_H #define EXTSTRSET_H #include <string> #include "strset3.h" class extStrSet : public strSet { public: extStrSet operator == (const extStrSet& rtSide); // Equal extStrSet operator < (const extStrSet& rtSide); // Strict subset extStrSet operator > (const extStrSet& rtSide); // Strict superset // Leave off other comparisons: != <= >= extStrSet ( ); extStrSet (std::string s); }; inline extStrSet& ss2extss (const strSet& ss) // Downcast { return *(extStrSet*)&ss ; } #endif </code></pre> extStrSet.cpp <pre><code>#include <iostream> #include <vector> #include <string> #include "extstrset3.h" #include "strset3.h" using namespace std; extStrSet::extStrSet() : strSet() {} extStrSet::extStrSet(string s) : strSet(s) {} extStrSet extStrSet::operator > (const extStrSet& rtSide) { extStrSet temp; extStrSet temp2; extStrSet newSet; temp = *this * rtSide; temp2 = *this == rtSide; if(temp2.isMember("true")) extStrSet newSet("false"); else if( rtSide.SIZE() == temp.SIZE() ) extStrSet newSet("true"); else extStrSet newSet("false"); return newSet; } extStrSet extStrSet::operator < (const extStrSet& rtSide) { extStrSet temp; extStrSet temp2; temp = *this * rtSide; temp2 = *this == rtSide; if(temp2.isMember("true")) extStrSet newSet("false"); else if( SIZE() == temp.SIZE() ) extStrSet newSet("true"); else extStrSet newSet("false"); return newSet; } extStrSet extStrSet::operator == (const extStrSet& rtSide) { extStrSet temp; temp = *this * rtSide; if( SIZE() == rtSide.SIZE() && SIZE() == temp.SIZE() ) extStrSet newSet("true"); else extStrSet newSet("false"); return newSet; } </code></pre>
Tags
<c++><class><operator-overloading>
Title
Error with derived class using overloaded operator from base class
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1. PO
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1. PO
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