Re: invalid use of template-name 'Array' without an argument(compile error, plz help)

#ifndef Array_H
#define Array_H

template< class elemType>
class Array {
public:
   // parameterize element type
   explicit Array( int size = DefaultArraySize );
   Array( elemType *array, int array_size );
   Array( const Array&rhs );

   virtual ~Array() { delete [] ia; }

   bool operator==( const Array& ) const;
   bool operator!=( const Array& ) const;

   Array& operator=( const Array& );
   int size() const { return _size; }

   virtual elemType& operator[](int index){ return ia[index]; }
   virtual void sort();

   virtual elemType min() const;
   virtual elemType max() const;
   virtual int find( const elemType&value ) const;

protected:
    static const int DefaultArraySize = 12;

    int _size;
    elemType *ia;
};

#endif
--------------------------------------------------------------------------------------------------------------
// Array.cpp

#include "Array.h"

/*
Array::Array(elemType *iarray, int iarray_size)
{
   ia = iarray;
   _size = iarray_size;
}
*/

Array::Array(const Array&rhs )

{
   ia = rhs;

}

Array::Array(int size )

{
   _size = size;
}

--------------------------------------------------------------------------------
#include<iostream>
#include "Array.h"

int main() {
   const int array_size = 4;

   // elemType becomes int
   Array<int> ia(array_size);

   // elemType becomes double
   Array<double> da(array_size);

   // elemType becomes char
   Array<char> ca(array_size);

    int ix;

    for ( ix = 0; ix< array_size; ++ix ) {
          ia[ix] = ix;
          da[ix] = ix * 1.75;
          ca[ix] = ix + 'a';
     }

     for ( ix = 0; ix< array_size; ++ix )
           std::cout<< "[ "<< ix<< " ] ia: "<< ia[ix]
                << "\tca: "<< ca[ix]
                << "\tda: "<< da[ix]<< std::endl;

  return 0;
}
------------------------------------------
but my compiler result is
------------
eric@eric-laptop:~/CppPrimer3$ g++ Array.cpp pg52.cpp
Array.cpp:13:1: error: invalid use of template-name ?Array? without an
argument list
Array.cpp:18:1: error: invalid use of template-name ?Array? without an
argument list
eric@eric-laptop:~/CppPrimer3$
--------------------
Is that Array is reserve word in C++ so we can not use it?

so idea what these errors talk about, plz help, thank a lot in
advance, Eric