Eric Niebler wrote:
On 1/29/2012 3:01 PM, Robert Ramey wrote:
I'm very confused about a number of things related to C++ standard and boost libraries dealing with numeric types. <snip>
All good questions. You're really asking about any user-defined numeric-like type, not just boost ones. Probably best to ask on comp.lang.c++.moderated. If you get an answer there, please post it here.
Hmmm - that was good advice. I found
http://groups.google.com/group/comp.lang.c++.moderated/browse_thread/thread/a6eed812f6c51f9/8fe717943806e700?lnk=gst&q=numeric_limits+specialization#8fe717943806e700
which - among other things says:
"*YOU* are allowed to provide a specialization for a user defined
type. The implementation is not allowed to provide a specialization
for a non-fundamental standard type."
which is the answer to my question.
it also answers indirectly my other questions. In particular
I realize now that boost/type_traits/is_integral.hpp is should't
be implemented in terms of numeric_limits - it's fine the way
it is. Also boost/type_traits/make_signed can't be implemented
in terms of numeric_limits either so IT'S fine the way
it is. If I want have make_signed