Well， #include <stdio.h> haven't any effect,it can delete,and this Statement if(alist == NULL) not have anyquestion. Because in head file already define NULL
But you does not make clear how to modified. ________________________________ From: peternilsson42 <[email protected]> To: [email protected] Sent: Thursday, June 11, 2009 8:03:08 AM Subject: [c-prog] Re: template class of array. --- In c-p...@yahoogroups. com, "iamwljiang" <iamwljiang@ ...> wrote: > > This code have link error,but I can't find it. > I need someone help me find it and tell me where is error > and why... > > I use Dev-C++ compile it that the error show is Array(int n=50); > and ~Array() link error. > > //////////// ///////// ///////// ///////// // > ///Array.h > /// > //////////// ///////// ///////// ///////// > #ifndef _ARRAY_H_ Identifiers with leading underscores are reserved. Use something like H_ARRAY_H. Don't use names like ARRAY_H because all-cap identifiers starting with E. [cf <errno.h>] <snip> > //////////// ///////// ///////// /// > // > //array.cpp > //////////// ///////// ///////// // Compiling a file of template definitions won't instantiate those definitions. Hence, most C++ headers include class and function definitions so they get instantiated when used. The linker will then strip out duplicates. You should look up explicit template instantiation in your C++ book. > #include "array.h" > #include <stdio.h> Why use stdio.h?!!! <snip> > if(alist == NULL) Error(memoryAllocat ionError) ; Don't use NULL, use 0. <snip> > if(n < 0) Error(invalidArrayS ize); > > T>::~Array() > { alist = new T[size]; Well this is screwed up! I'm surprised it compiled. -- Peter [Non-text portions of this message have been removed]
