Re: [Boost-users] [Spirit] Qi int_parser rejecting a negative signed std::intmax_t

On 13/11/2018 05:27, Michael Powell wrote:

Oops, my mistake. An error in one of the rules. Fixed it, and can demonstrate that negative values do not seem to parse correctly:

http://coliru.stacked-crooked.com/a/370b6aa5c167434b

Hex and octal literals produce unsigned values. You need to put those into a uintmax_t, not an intmax_t. FWIW, you can still use an intmax_t in your AST if you want, as the automatic attribute conversion will permit the twos-complement conversion (though it might annoy some sanitisers). hex_val %= no_case["0x"] >> uint_parser{}; oct_val %= "0" >> uint_parser{}; dec_val %= int_parser{}; If you feel especially enthused, you can use std::make_unsigned_tast::int_t instead.