C++17 additions

Attributes in C++17

With C++17 we get three more standard attributes:

• [[fallthrough]]

• [[maybe_unused]]

• [[nodiscard]]

Extra Info: The new attributes were specified in P0188 and P0068(reasoning).

Plus three supporting features:

• Attributes for Namespaces and Enumerators
• Ignore Unknown Attributes
• Using Attribute Namespaces Without Repetition

Let’s go through the new attributes first.

Two new attributes

[[fallthrough]] attribute

Indicates that a fall-through in a switch statement is intentional and a warning should not be issued for it.

Example: