You forget the tricky 2nd difference between classes and structs.
Quoth the standard (§11.2.2 in C++98 through C++11):
In absence of an access-specifier for a base class, public is assumed when the derived class is declared struct and private is assumed when the class is declared class.
And just for completeness’ sake, the more widely known difference between class and struct is defined in (11.2):
Member of a class defined with the keyword class are private by default. Members of a class defined with the keywords struct or union are public by default.
Additional difference: the keyword class can be used to declare template parameters, while the struct keyword cannot be so used.
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