spirit SA attribute numbers

Question

Using phoenix, with a rule like this:

start_ = ( Rule1[SA1] >> +Rule2[SA2] >> Rule3 )
[ SA ];

Is it correct that, inside SA,

• _1 is Rule1's attribute
• _2 is (+Rule2)'s attribute
• _3 is Rule3's attribute?

?

Answer 1

Yes.

Also, qi::_0 is the combined attribute (i.e. a Fusion tuple of (qi::_1, qi::_2, qi::_3))