The following is the syntax of function-specifiers.
function-specifier ::=virtual|inline|explicit
The 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 =0
(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.
The 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 inline
regardless of whether inline appears in the implementation.
However a C++ function satisfies a specification that uses inline
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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