template syntax

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2 total messages Started by nguyen Tue, 28 Jul 1992 21:35

#305

Author: nguyen
Date: Tue, 28 Jul 1992 21:35

62 lines
2122 bytes

<..> should be specified in all functions inside a class header,
except constructor and destructor. ARM p.350.

The following code compiles with AT&T but not with GNU g++2.0
(gcc-2.2.2). Who is wrong?

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


template<class T1, class T2>
class foo{
public:
  T1 value1;
  T2 value2;
  foo(T1 a, T2 b) { value1 = a; value2 = b;}
  void bar(foo<T1,T2>& t) { value1 = t.value1; value2 = t.value2;} //********
  void print() { cout << value1 << " " << value2 << endl;}
};



main()
{
  foo<int, int> fi(10, 0), fii(0, 5);
  foo<float, int> ff(5.0, 0);
  foo<char, int> fc('c', 1);


  fi.print();
  fii.print();
  fii.bar(fi);
  fii.print();
  ff.print();
  fc.print();
  
  cout << "hello" << endl;
}
---------------------------
% /home/thuban/software3/gnu/bin/g++ -I /home/thuban/software3/gnu/lib/g++-incl
ude gnu_template.C
gnu_template.C:10: parse error before `,'
gnu_template.C:10: parse error before `,'
gnu_template.C:10: parse error before `,'
gnu_template.C: In method `void  foo<char ,int>::bar (...)':
gnu_template.C:10: `t' undeclared (first use this function)
gnu_template.C:10: (Each undeclared identifier is reported only once
gnu_template.C:10: for each function it appears in.)
gnu_template.C: In method `void  foo<float ,int>::bar (...)':
gnu_template.C:10: `t' undeclared (first use this function)
gnu_template.C: In method `void  foo<int ,int>::bar (...)':
gnu_template.C:10: `t' undeclared (first use this function)
-------------

Van-Duc Nguyen
General Electric 
Research & Development Ctr
1 River Road, Room K1-5C39.
Schenectady, NY 12301.
Phone: (518) 387-5659
Fax:   (518) 387-6845
nguyen@crd.ge.com

Re: template syntax

#336

Author: Joe Buck
Date: Wed, 29 Jul 1992 02:17

29 lines
1233 bytes

In article <9207282135.AA11012@etamin.crd.Ge.Com> nguyen@sol.crd.ge.com writes:
>The following code compiles with AT&T but not with GNU g++2.0
>(gcc-2.2.2). Who is wrong?

gcc/g++ is wrong, but it's not surprising given the ambiguity of some of
the template specs. If you change the problem line in your template class
definition from

>template<class T1, class T2>
>class foo{
>public:
>  T1 value1;
>  T2 value2;
>  foo(T1 a, T2 b) { value1 = a; value2 = b;}
>  void bar(foo<T1,T2>& t) { value1 = t.value1; value2 = t.value2;} //********
>  void print() { cout << value1 << " " << value2 << endl;}
>};

to

	...
  void bar(foo& t) { value1 = t.value1; value2 = t.value2;}
	...

your program compiles, runs, and produces the right answers.


--
Joe Buck	jbuck@ohm.berkeley.edu

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