🚀 go-pugleaf

/*
Hallo,

it seems to be there is an error in g++ 2.2.2

it is not possible to implement global(not friend)
ostream operators for template classes

the following is a shorthand example of the problem

I thank for your efforts

Karsten

karsten@Inf-Technik.TH-Ilmenau.DE

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*/

#include <iostream.h>

template <class T>
class Array {
	T* _arr;
	int _len;
public:
	Array(int len) { _arr = new T[_len = len]; }
	int	len() const { return _len; }
	T&	operator[](int i) {return _arr[i]; }
	void	print(ostream& s) const 
	{
		for ( int i = 0; i < _len; i++ ) {
			s << _arr[i] << " ";
		}
	}

	/* version 1 works properly, but friend is not necesssary */
	/* thats why version 2 */
	/*
	friend ostream& operator<<(ostream& s, const Array& a) 
	{ a.print(s); return s; }
	*/
};

/* works properly */
template <class T>
inline int empty(const Array<T>& a)
{
	return (a.len() == 0);
}

/* version 2 works with cfront, but not with gnu */
/*
/space/localtmp/gnu/bin/g++  -B/space/localtmp/gnu/lib/gcc/sparc-sun-sunos4.1.1/2.2.2/
-I/space/local/gnu/lib/g++-include -g -DPRECOND -DYYDEBUG -DDEBUG \
-I/home/usr/omsi/work/inc \
        -c comp_out.cc
comp_out.cc: In function `int  main ()':
comp_out.cc:42: warning: dbx info for template class methods not yet supported
/space/localtmp/gnu/bin/gcc: Internal compiler error: program cc1plus got fatal signal 11
*** Error code 1
make: Fatal error: Command failed for target `comp_out.o'
*/

template <class T>
inline ostream& operator<<(ostream& s, const Array<T>& a)
{
	a.print(s); return s;
}

main()
{
	Array<int> a(10);
	cerr << empty(a) << endl;
	cerr << a << endl;
}

-- 

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| Dipl.-Ing. Karsten Pahnke     | Telefon : 0037 672 691167 | 
| Technische Hochschule Ilmenau |           0037 672 691168 |       
| PSF 327, O-6300 Ilmenau       | Telefax : 0037 672 691517 | 
|-----------------------------------------------------------| 
| E-Mail : Pahnke@Inf-Technik.TH-Ilmenau.DE                 |
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