Function specifiers

The available function specifiers for function definitions are:

• constexpr, which can be used to declare constexpr functions and constexpr constructors, and is described in The constexpr specifier (C++11).
• inline, which instructs the compiler to expand a function definition at the point of a function call.
• explicit, which can only be used for member functions of classes, and is described in Explicit conversion constructors (C++ only).
• virtual, which can only be used for member functions of classes, and is described in Virtual functions (C++ only).