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Article #139

Template Problems

#139
From: George Thiruvathukal
Date: Wed, 22 Jul 1992 23:51
71 lines
2138 bytes
Hello GNU Friends,

I am having a great deal of difficulty with templates in gcc 2.1. The 
following three files are listed:
  1. test2.C - a driver program to test drive my ordered list class
  2. linked.h - an interface to "linked.C"
  3. errors - error messages from gcc -c test2.C

A suspicious error message is being generated by the compiler to indicate
that the object in the "." expression is not of an aggregate type, but by
all evidence present it appears to be so. Thanks for any help. Should I
be using gcc 2.2.2 ???

// This file is test2.C

#include "linked.h"

class Int {
private:
  int i;
public:
  Int(int i) : i(i) {};
};

main()
{
  OrderedList<Int> ols();
  Int a(25), b(30), c(35);
  ols.insert(a);  // line 13
  ols.insert(b);
  ols.insert(c);
}

// This file is linked.h
#ifndef _LINKED_H_
#define _LINKED_H_

template <class Value>
class Linkable {
friend class OrderedList;
private:
   Value &value;
   Linkable *next;
public:
   Linkable(Value &v, Linkable *next) : value(v), next(next) { }

};

template <class Value>
class OrderedList {
private:
   Linkable<Value> *front;
public:
   OrderedList(void);
   int put(Value &v);
   int remove(Value &v);
};

#endif

// These are the errors generated when I compile test2.C (gcc -c)

test2.C: In function `int  main ()':
test2.C:13: object in '.' expression is not of aggregate type
test2.C:14: object in '.' expression is not of aggregate type
test2.C:15: object in '.' expression is not of aggregate type
-- 
George K. Thiruvathukal
IIT - School of Computer Science - gkt@iitmax.iit.edu
Tellabs - Data Communications Division - att!tellab5!gkt
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From: gkt@iitmax.iit.edu (George Thiruvathukal)
Newsgroups: gnu.gcc.help
Subject: Template Problems
Message-ID: <1992Jul22.235122.17100@iitmax.iit.edu>
Date: 22 Jul 92 23:51:22 GMT
Organization: Illinois Institute of Technology / Academic Computing Center
Lines: 71