The following is the syntax of function-specifiers.
virtual specifier may be used only in declaration of
a nonstatic class member function within a class specification
(see Section r.7.1.2 of [Stroustrup91]).
To specify a pure virtual member function in an
abstract class, one should use an initializer of the form
(see Section 10.3 of [Ellis-Stroustrup90]).
A class with any pure virtual functions is an abstract class.
See section 7.10 Abstract Classes for more information about abstract classes.
inline specifier should only be used when one desires to record
an implementation design decision,
as it does not usually concern the clients of a C++ function.
A C++ function satisfies a specification that does not use
regardless of whether
inline appears in the implementation.
However a C++ function satisfies a specification that uses
only if the function also uses
inline, or a sugar for it
such as giving the definition of a member function in the class declaration
(Section 9.3.2 [Ellis-Stroustrup90]).
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