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Interface inheritance only specifies function prototypes—name, parameters, return type, and const qualifiers. Thus, no functions are implemented. Typically, in C++, when you are using interface inheritance your classes will simply be collections of pure virtual functions:

struct foo
virtual int bar1(const std::string&) = 0;
virtual char bar2(const std::vector<float>&) const = 0;

Implementation inheritance implies that [some] functions are implemented so that extending classes may call base class implementations when appropriate.

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