4.23.3 Access to elements of a user defined type

Access to elements of a user defined type via .: <object>.<element_name>. The <element_names> are from the definition of the type. Additional, all (potentially) ring dependent elements have an additional entry r_<element_name> for the corresponding ring.
Example:

newstruct("nt","int a,poly b,string c"); nt A; 3+A.a; ==> 3 A.c="example string"; ring r; A.b=poly(1); // assignment: expression must be of the given type A; ==> c=example string ==> b=1 ==> a=0 A.r_b; ==> // coefficients: ZZ/32003 ==> // number of vars : 3 ==> // block 1 : ordering dp ==> // : names x y z ==> // block 2 : ordering C