on Tue Aug 21 2007, Martin Apel <martin.apel-AT-simpack.de> wrote:
Hughes, James wrote:
Hello all,
I want some template code to assert if the passed in template type is NOT derived from a particular base class.
I've looked through the Template Metaprogamming book, but haven't seen anything that can do this, but I seem to remember something along those lines.
Can anyone help?
James
Hi James,
the easiest way is something like the following:
#include <boost/type_traits.hpp> #include <boost/static_assert.hpp>
BOOST_STATIC_ASSERT (boost::is_base_of<Base, Derived>::value);
BOOST_MPL_ASSERT((boost::is_base_of<Base,Derived>)) Don't use BOOST_STATIC_ASSERT if you can help it. It gives far inferior results when assertions fail. -- Dave Abrahams Boost Consulting http://www.boost-consulting.com The Astoria Seminar ==> http://www.astoriaseminar.com