c++/10541: template <char * w_val > does not work

[gianni at mariani dot ws]

>Number:         10541
>Category:       c++
>Synopsis:       template <char * w_val > does not work
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Apr 29 16:26:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     gianni at mariani dot ws
>Release:        GCC 3.2.2
>Organization:
>Environment:
Linux RH 8.0
configure --enable-shared --enable-threads=posix --disable-checking --host=i386-redhat-linux --with-system-zlib --enable-__cxa_atexit
Thread model: posix
gcc version 3.2.2
>Description:

g++ gives a number of errors to the code below.  As far as I can tell it's legal C++.


g++     tt6.cpp   -o tt6
tt6.cpp:43: could not convert template argument `0' to `char*'
tt6.cpp:43: ISO C++ forbids declaration of `m_cstr' with no type
tt6.cpp:45: `0' is not a valid template argument
tt6.cpp:45: it must be the address of an object with external linkage
tt6.cpp:45: ISO C++ forbids declaration of `m_cstr_c' with no type
tt6.cpp:47: `tester::m_static' is not a valid template argument
tt6.cpp:47: it must be the address of an object with external linkage
tt6.cpp:47: ISO C++ forbids declaration of `m_cstr_s' with no type
make: *** [tt6] Error 1

#include <cassert>

template < char * w_val >
class IType
{
    public:
     
    char *                                          m_value;
     
    inline IType()
      : m_value( w_val )
    {
    }
     
    inline operator char * & ()
    {
        return m_value;
    }

    inline operator const char * & () const
    {
        return m_value;
    }

    inline char * & operator = ( const char * & i_value )
    {
        m_value = i_value;

        return m_value;
    }

};



class tester
{
    public:

    const static char *                             m_static;

    IType<0>                                       m_cstr;

    IType<static_cast<char *>( 0 )>                m_cstr_c;

    IType<m_static>                                m_cstr_s;

};
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: