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QuestionCompilation Problem Pin
tcnm12-Dec-12 9:18
membertcnm12-Dec-12 9:18 
Four programs (listings 19.4, 19.5, 19.6 and 19.7) in the book
"Teach Yourself C++ in 21 Days" by Jesse Liberty and Bradley Jones
do not compile.   The first of these programs is as follows:

//Listing 19.4 Using Operator ostream
#include <iostream>
using namespace std;

const int DefaultSize = 10;

class Animal
{
   public:
      Animal(int);
      Animal();
      ~Animal() {}
      int GetWeight() const { return itsWeight; }
      void Display() const { cout << itsWeight; }
   private:
      int itsWeight;
};

Animal::Animal(int weight):
   itsWeight(weight)
{}

Animal::Animal():
   itsWeight(0)
{}

template <class T>   // declare the template and the parameter
class Array                  // the class being parameterized
{
   public:
      // constructors
      Array(int itsSize = DefaultSize);
      Array(const Array &rhs);
      ~Array() { delete [] pType; }

      // operators
      Array& operator=(const Array&);
      T& operator[](int offSet) { return pType[offSet]; }
      const T& operator[](int offSet) const
         { return pType[offSet]; }
      // accessors
      int GetSize() const { return itsSize; }

      // template <class T>
      friend ostream& operator<< (ostream&, Array<T>&);
   private:
      T *pType;
      int   itsSize;
};

template <class T>
ostream& operator<< (ostream& output, Array<T>& theArray)
{
   for (int i = 0; i < theArray.itsSize; i++)
   {
         output << "[" << i << "] " << theArray[i] << endl;
   }
   return output;
}


// implementations follow...

// implement the Constructor
template <class T>
Array<T>::Array(int size):
   itsSize(size)
{
   pType = new T[size];
   for (int i = 0; i < size; i++)
         pType[i] = 0;
}

// copy constructor
template <class T>
Array<T>::Array(const Array &rhs)
{
   itsSize = rhs.GetSize();
   pType = new T[itsSize];
   for (int i = 0; i < itsSize; i++)
         pType[i] = rhs[i];
}

// operator=
template <class T>
Array<T>& Array<T>::operator=(const Array &rhs)
{
   if (this == &rhs)
         return *this;
   delete [] pType;
   itsSize = rhs.GetSize();
   pType = new T[itsSize];
   for (int i = 0; i < itsSize; i++)
         pType[i] = rhs[i];
   return *this;
}

int main()
{
   bool Stop = false;         // flag for looping
   int offset, value;<pre lang="c++"></pre>
   Array<int> theArray;

   while (Stop == false)
   {
         cout << "Enter an offset (0-9) ";
         cout << "and a value. (-1 to stop): ";
         cin >> offset >> value;

         if (offset < 0)
            break;

         if (offset > 9)
         {
            cout << "***Please use values between 0 and 9.***\n";
            continue;
         }

         theArray[offset] = value;
   }

   cout << endl << "Here's the entire array:" << endl;
   cout << theArray << endl;
   return 0;
}

Attempting to compile this program on Linux with g++ produces the
following message:

g++ -fpermissive list1904.cpp -o List19.4
list1904.cpp:45:52: warning: friend declaration ‘std::ostream& operator<<(std::ostream&, Array<T>&)’ declares a non-template function [-Wnon-template-friend]
list1904.cpp:45:52: note: (if this is not what you intended, make sure the function template has already been declared and add <> after the function name here)
/tmp/ccgXupn5.o: In function `main':
list1904.cppFrown | :( text+0x102): undefined reference to `operator<<(std::ostream&, Array<int>&)'
collect2: error: ld returned 1 exit status
make: *** [List19.4] Error 1

I would very much appreciate any help in resolving this problem.
Thank you very much,

tim_mann

tcnm

-- modified 14-Dec-12 16:09pm.
QuestionRe: Compilation Problem Pin
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