[Boost-users] [regex] match_results: signatures of position(sub) and length(sub) are different, why?

Subject: [Boost-users] [regex] match_results: signatures of position(sub) and length(sub) are different, why?
From: Frédéric Bron (frederic.bron_at_[hidden])
Date: 2012-12-12 08:22:43

Hi,

On the following link, we can see that length and position member
functions have different signatures:
http://www.boost.org/doc/libs/1_52_0/libs/regex/doc/html/boost_regex/ref/match_results.html

difference_type length(int sub = 0) const;
difference_type position(unsigned int sub = 0) const;

Why int for length(sub) and unsigned int for position(sub)?

Frédéric