gcc 3.1: I get a strange warning using it.

gcc 3.1: I get a strange warning using it.

[Andrea Latina]

hi all,

I just installed gcc 3.1 on my redhat-linux-i686, with:

configure --enable-thread.

When I compile this:

	template <class T> NewFile &operator << (const std::list<T> &l )
	{
		*this << l.size();

		std::list<T>::const_iterator i = l.begin();

		for (; i != l.end(); i++)	*this << *i;
	
		return *this;
	}

I get this warning:

/home/latina/PRISMA/development/andrix/include/File.hh: In member function
    `NewFile& NewFile::operator<<(const std::list<T, std::allocator<_CharT>
    >&)':
/home/latina/PRISMA/development/andrix/include/File.hh:81: warning: 
`typename
    std::list<T, std::allocator<_CharT> >::const_iterator' is implicitly a
    typename
/home/latina/PRISMA/development/andrix/include/File.hh:81: warning: 
implicit
    typename is deprecated, please see the documentation for details
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

what is this???????

where should I look to get more details about this warning?

or, just for I need to compile quickly my sources and I dislike 
warnings... which syntax is it actually the correct one?

thanks,
andrea

ps: all those souces have been always compiled, using gcc-3.0.4, without 
any message.