How do I add to an array from a static method?

C++ Passing struct array to function. Linker error undefined reference...?

• Hi, I am new to C++ programming and I have a Class and array of structures. struct kontakt { string jmeno; string adresa; string telefon; }; class CPhoneBook { public: CPhoneBook ( void ); ~CPhoneBook ( void ); bool Add ( const string & name, const string & address, const string & phone ); bool Del ( const string & name, const string & address ); bool Search ( const string & name, const string & address, string & phone ) ; void quicksort ( struct kontakt array[], int min, int max); void swap(struct kontakt array[],int min, int max); void posun(int stred,const string & name,const string & address,const string & phone); void print(); private: int pocet; //pocet kontaktu v poli int size; //velikost pole int z; struct kontakt *ukkontakt;}; When calling for quicksort(ukkontakt,min,pocet); in method Add. It returns C:\Users\Bulwa\AppData\Local\Temp\ccIFba... In function `ZN10CPhoneBook3AddERKSsS1_S1_': [Linker error] undefined reference to `CPhoneBook::quicksort(kontakt*, int, int)' C:\Users\Bulwa\AppData\Local\Temp\ccIFba... ld returned 1 exit status The methods look like this void CPhoneBook::quicksort (struct kontakt array[], int min, int max) { if(min<max) { int b=min; for(int i=min+1;i<max;i++) { if array[i].jmeno>array[min].jmeno {swap(array,i,++b;) } } swap(array,min,b); quicksort(array,min,b); quicksort(array,b+1,max); } void CPhoneBook::swap(struct kontakt array[],int min, int max) { int x=array[max].jmeno; array[max].jmeno=array[min].jmeno; array[min].jmeno=x; } What am i doing wrong ? Thanks. This is the Add Class. I didnt copy the whole code, it is too long and irrelevant =P bool CPhoneBook::Add ( const string & name,const string & address,const string & phone ) { int x,y; for(y=pocet;y size) { size=size*2; kontakt *uk2=ukkontakt; ukkontakt=new kontakt[size]; for(x=0;x bool CPhoneBook::Add ( const string & name,const string & address,const string & phone ) { int x,y; for(y=pocet;y size) { size=size*2; kontakt *uk2=ukkontakt; ukkontakt=new kontakt[size]; for(x=0;x

• Answer:

  I can't see the Add method here, but I'll guess that it might be calling quicksort as a static method, but the class defines it as an instance method. It really ought to be static, since it doesn't use any fields or methods of a CPhoneBook object. Same for swap(). So, if you're calling CPhoneBbook::quicksort(somearray, min, max) in the Add() method, go to the class declaration and add "static" in front of the declarations for quicksort() and swap(). Don't change the implementation.