# a literal “any string” is treated as char const *. If you must assign such a literal string to a ptr-to-char variable, you must cast away the constness (Macquaries)
# If you have a const method in a non-const class instance, and if inside that method you access some instance fields, those fields are implicitly converted to const variables. See P215 [[eff STL]]
# as stated in other posts (like http://bigblog.tanbin.com/2012/02/c-const-methods-mean-this-is-bitwise.html), in a const method, “this” is converted to a ptr-to-const.