Dear Mr. Bjarne Stroustrup:
Thanks your suggestion, I follow it but it show fatal error:Array.cpp:
no such file
so
I add #include "Array.cpp" in my main program, pg52.cpp
then
it can compile
but
when I run it, it response
Segmentation fault
again it's g++ 4.5.2. What may cause wrong?
hope to see your suggestion/advice again, and thanks a lot in advance,
Eric
-----------------------------------------------------
On Fri, 2011-06-10 at 22:18 -0400, bs wrote:
> On 6/10/2011 9:43 PM, eric wrote:
> > Dear Bjarne Stroustrup:
> >
> > I copied a piece of codes from book(C++ primer 3rd Ed) chapter 2 about
> > page 52.
> > but it failed to be compiled under my g++ 4.5.2
> > here is the program
>
> That book is an antique, but I think that the problem may simply be that
> you can't separately compile pg52.cpp and Array.cpp. Try
> #include<Array.cpp> in Array.h .
>
> > -----------------------
> >
> > eric@eric-laptop:~/CppPrimer3$ g++ Array.cpp pg52.cpp
> > /tmp/ccE9MPMg.o: In function `main':
> > pg52.cpp:(.text+0x23): undefined reference to `Array<int>::Array(int)'
> > pg52.cpp:(.text+0x37): undefined reference to
> > `Array<double>::Array(int)'
> > pg52.cpp:(.text+0x4b): undefined reference to `Array<char>::Array(int)'
> > collect2: ld returned 1 exit status
> > --------------------------------------------------
> > #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;
> > }
> > -------------------
> > // Array.cpp
> >
> > #include "Array.h"
> >
> > /*
> > Array::Array(elemType *iarray, int iarray_size)
> > {
> > ia = iarray;
> > _size = iarray_size;
> > }
> > */
> >
> > template<class T> Array<T>::Array(const Array<T> &rhs )
> > {
> > ia = rhs;
> > }
> >
> > template<class T> Array<T>::Array(const int size )
> > {
> > _size = size;
> > }
> >
> >
> > ------------------------------------------------------
> > #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
> > ---------------------------------------------------------------
> > I asked mailing list in gcc, but so far I did not get any useful
> > response. I know the book's author Stanley B. Lippman or Josee Lajoie
> > ever work with you. And I tried to reach Stanley B. Lippman, I can not
> > find his email addreess. I emailed Josee Lajoie but again never get any
> > message from her (for 2 or 3 days).
> > hope to get your help on this problem.
> > Thanks your efforts a lot in advance
> > Eric
> >
> >
>
