"Eric Niebler" <eric@boost-consulting.com> writes:
Yes, I used _1, _2, _3 for a long time. I abandoned it because of name conflicts with the identically-named placeholders from other boost libraries. I picked s1, s2, ... for two reasons: 1) The "s" in "s1" stands for "sub-match", which is what these thigs represent. 2) s1 kind of looks like $1, which is the perl equivalent.
That said, I'm open to suggestions for avoiding the name conflicts. I would consider switching back to _1 _2 _3 if the technical problems were overcome and if people liked it better.
FWIW, The bind library placeholders are going to be moved out of the unnamed namespace soon, unless Peter has changed his mind. -- Dave Abrahams Boost Consulting http://www.boost-consulting.com