This might strike you as a contradiction in terms, but a virtual inline makes perfect sense. If the compiler knows the type of the object statically, it's called as an inline. If the type is not known statically, a virtual function call is made. If you are using an inline for valid reasons, such as when a pointer or reference is used to access the object, this can be a useful technique. The this pointer is included, so calls to virtual inline members of the same object always occur virtually. Recall that writing MyMember(); is equivalent to writing this->MyMember();.
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