Re: [Boost-users] [proto] char vs. int behaviour when matching

Maurizio Vitale wrote:

Proto behaves in a different way when matching terminal<char> and terminal<int>. The only difference I'm aware is that it is implementation defined whether 'char' means 'signed char' or 'unsigned char' but it has to mean one of the two. <snip>

That's where you're mistaken. char, signed char and unsigned char are 3 distinct types. #include #include int main() { // char is not signed char or unsigned char BOOST_MPL_ASSERT_NOT((boost::is_same)); BOOST_MPL_ASSERT_NOT((boost::is_same)); // but int is signed int BOOST_MPL_ASSERT((boost::is_same)); } -- Eric Niebler BoostPro Computing http://www.boostpro.com