no matching function for call to

Question

I was given to implement the function     static double distanta  const Complex amp   const Complex amp       which return the distance between two Complex numbers  The definition of the function it is inside the Complex class and I have implemented it like that    double Complex  distanta const Complex  amp a  const Complex  amp b            double x   a real   - b real        double y   a imag   - b imag         return sqrt x   x   y   y       As far as I know a static function can only access static members and my class only has  double  re  double  im    as data members   Within the main function I have called it as    include  lt iostream gt   include  complex h   using namespace std   int main         Complex  firstComplexNumber       firstComplexNumber   new Complex 81  93        cout  lt  lt   Numarul complex este     lt  lt   firstComplexNumber  lt  lt  endl       Complex  secondComplexNumber      secondComplexNumber   new Complex 31  19        cout  lt  lt   Distanta dintre cele doua numere   lt  lt endl  lt  lt  endl      Complex  distanta firstComplexNumber  secondComplexNumber       return 0      and the error I get is   error  no matching function for call to  Complex  distanta Complex  amp   Complex  amp     Could you please tell me what is it that I m doing wrong   Thanks

User · Answer

You are trying to pass pointers  which you do not delete  thus leaking memory  where references are needed  You do not really need pointers here   Complex firstComplexNumber 81  93   Complex secondComplexNumber 31  19    cout  lt  lt   Numarul complex este     lt  lt  firstComplexNumber  lt  lt  endl                                                         No need to dereference now          Complex  distanta firstComplexNumber  secondComplexNumber

User · Answer

You are passing pointers  Complex   when your function takes references  const Complex amp    A reference and a pointer are entirely different things  When a function expects a reference argument  you need to pass it the object directly  The reference only means that the object is not copied   To get an object to pass to your function  you would need to dereference your pointers   Complex  distanta  firstComplexNumber   secondComplexNumber     Or get your function to take pointer arguments   However  I wouldn t really suggest either of the above solutions  Since you don t need dynamic allocation here  and you are leaking memory because you don t delete what you have newed   you re better off not using pointers in the first place   Complex firstComplexNumber 81  93   Complex secondComplexNumber 31  19   Complex  distanta firstComplexNumber  secondComplexNumber

[c++] no matching function for call to ' '

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