Hello
something is wrong with my gcc compiler
here is my code
=== snip ===
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; }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.GetSize(); i++)
output << "[" << i << "] " << theArray[i] << endl;
return output;
}== snip ===
g++ -ansi -pedantic -Wall -o ostream_operator_problem.out ostream_operator_problem.cpp -L /opt/sfw/gcc-3/lib/ -R /opt/sfw/gcc-3/lib/ -lstdc++
g++ -o ostream_operator_problem.out ostream_operator_problem.cpp -L /opt/sfw/gcc-3/lib/ -R /opt/sfw/gcc-3/lib/ -lstdc++
ostream_operator_problem.cpp:46: warning: friend declaration `std::ostream& operator<<(std::ostream&, Array<T>&)' declares a non-template function
ostream_operator_problem.cpp:46: warning: (if this is not what you intended,
make sure the function template has already been declared and add <> after
the function name here) -Wno-non-template-friend disables this warning
Undefined first referenced
symbol in file
operator<<(std::basic_ostream<char, std::char_traits<char> >&, Array<int>&)/var/tmp//ccMap1MM.o
ld: fatal: Symbol referencing errors. No output written to ostream_operator_problem.out
collect2: ld returned 1 exit status
Please help
gcc -v
Reading specs from /opt/sfw/gcc-3/lib/gcc-lib/i386-pc-solaris2.9/3.3.2/specs
Configured with: ../gcc-3.3.2/configure --prefix=/opt/sfw/gcc-3 --with-ld=/usr/ccs/bin/ld --with-as=/usr/ccs/bin/as --without-gnu-ld --without-gnu-as --enable-shared
Thread model: posix
gcc version 3.3.2
bash-2.05$ uname -X System = SunOS Node = Hirschgraben15-23 Release = 5.9 KernelID = Generic_112234-12 Machine = i86pc BusType = <unknown> Serial = <unknown> Users = <unknown> OEM# = 0 Origin# = 1 NumCPU = 1
best regards
Morten Gulbrandsen
// 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; }
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.GetSize(); 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;
Array<int> theArray;
while (!Stop)
{
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 << "\nHere's the entire array:\n";
cout << theArray << endl;
return 0;
}
/*
g++ -ansi -pedantic -Wall -o ostream_operator_problem.out ostream_operator_problem.cpp -L /opt/sfw/gcc-3/lib/ -R /opt/sfw/gcc-3/lib/ -lstdc++
g++ -o ostream_operator_problem.out ostream_operator_problem.cpp -L /opt/sfw/gcc-3/lib/ -R /opt/sfw/gcc-3/lib/ -lstdc++
ostream_operator_problem.cpp:46: warning: friend declaration `std::ostream&
operator<<(std::ostream&, Array<T>&)' declares a non-template function
ostream_operator_problem.cpp:46: warning: (if this is not what you intended,
make sure the function template has already been declared and add <> after
the function name here) -Wno-non-template-friend disables this warning
Undefined first referenced
symbol in file
operator<<(std::basic_ostream<char, std::char_traits<char> >&, Array<int>&)/var/tmp//ccMap1MM.o
ld: fatal: Symbol referencing errors. No output written to ostream_operator_problem.out
collect2: ld returned 1 exit status
*/
/*
Your Comeau C/C++ test results are as follows:
Comeau C/C++ 4.3.3 (Aug 6 2003 15:13:37) for ONLINE_EVALUATION_BETA1
Copyright 1988-2003 Comeau Computing. All rights reserved.
MODE:strict errors C++
In strict mode, with -tused, Compile succeeded (but remember, the Comeau online compiler does not link).
*/
