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Does the order in which I list the base classes matter when one of them is empty and the other one is not?
class Foo : normal_class, empty_class { ... };
class Foo : empty_class, normal_class { ... };
Does the order affect the compiler’s ability to apply the empty base class optimization?
I don’t think it matters – although I tend to try to put an empty base first anyway.
There’s an interesting note on multiple empty bases on the boost site: http://www.boost.org/doc/libs/1_38_0/libs/utility/operators.htm#old_lib_note