3 implicit conversions by c++ compiler – const

# 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.

# http://bigblog.tanbin.com/2012/04/non-primitive-field-in-const-method.html

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