gcc 3.0 template problem - only for C++ professionals or a bug ?

[Helmut Schröger <helmut dot schroeger at rl-ag dot de>]

Hi !

Could anyone please give me a hint whats wrong with my code ?
Please do not worry about the "semantical" correctness of the
code itself (it's a just a demo) but only about getting the
followong error from the gcc 3.0 compiler:

g++     main.cpp   -o main
/usr/local/gnu/include/g++-v3/bits/stl_algo.h: In function `const _Tp&
   std::__median(const _Tp&, const _Tp&, const _Tp&) [with _Tp =
namespace_t]':
/usr/local/gnu/include/g++-v3/bits/stl_algo.h:1605:   instantiated from
`void std::__introsort_loop(_RandomAccessIter, _RandomAccessIter, _Tp*,
_Size) [with _RandomAccessIter = std::__normal_iterator<namespace_t*,
std::vector<namespace_t, std::allocator<namespace_t> > >, _Tp = namespace_t,
_Size = int]'
/usr/local/gnu/include/g++-v3/bits/stl_algo.h:1643:   instantiated from
`void std::sort(_RandomAccessIter, _RandomAccessIter) [with
_RandomAccessIter = std::__normal_iterator<namespace_t*,
std::vector<namespace_t, std::allocator<namespace_t> > >]'
main.cpp:28:   instantiated from here
/usr/local/gnu/include/g++-v3/bits/stl_algo.h:48: passing `const
namespace_t'
   as `this' argument of `bool namespace_t::operator<(const namespace_t&)'
   discards qualifiers
/usr/local/gnu/include/g++-v3/bits/stl_algo.h:49: passing `const
namespace_t'
   as `this' argument of `bool namespace_t::operator<(const namespace_t&)'
   discards qualifiers
/usr/local/gnu/include/g++-v3/bits/stl_algo.h:51: passing `const
namespace_t'
   as `this' argument of `bool namespace_t::operator<(const namespace_t&)'
   discards qualifiers
/usr/local/gnu/include/g++-v3/bits/stl_algo.h:55: passing `const
namespace_t'
   as `this' argument of `bool namespace_t::operator<(const namespace_t&)'
   discards qualifiers
/usr/local/gnu/include/g++-v3/bits/stl_algo.h:57: passing `const
namespace_t'
   as `this' argument of `bool namespace_t::operator<(const namespace_t&)'
   discards qualifiers

The code is as follows:


#include <string>
#include <vector>
#include <algorithm>

class namespace_t
{
public:
        std::string name;
        bool operator<(const namespace_t&);
};


bool namespace_t::operator<(const namespace_t& y)
{
	std::string xn;
	std::string yn;
      return xn < yn;
}


typedef std::vector<namespace_t> namespaceSequence_t;

int main(void)
{
	namespaceSequence_t namespaces;
	std::sort(namespaces.begin(), namespaces.end());
	return 0;
}

The same code works with the Microsoft VC60 compiler. Please help !

Thank you in advance

Helmut Schröger