-----Original Message----- From: boost-bounces@lists.boost.org [mailto:boost-bounces@lists.boost.org] On Behalf Of Edward Diener
I have never understood the definition of a pp-number in the C++ standard. I am using the 1998 version and I read:
ppnumber: digit . digit ppnumber digit ppnumber nondigit ppnumber e sign ppnumber E sign ppnumber .
Since "ppnumber digit" and "ppnumber nondigit" covers all sequences beginning either with a "digit" or a ".digit" followed by anything else which is not a whitespace character or a comment, why specify the last three items ?
Despite the name, 'nondigit' is not any non-digit character. It is just the alphabetic characters, the underscore, and universal character names (subject to annex E). Thus, the other productions are for the decimal point (.) and for the sign (+ or -). Regards, Paul Mensonides