What is this crazy C++11 syntax ==> struct : bar {} foo {};?

Question

What could this possibly mean in C++11?

struct : bar {} foo {};

Answer 1

This defines:

• an anonymous struct,
• which is derived publicly from bar
• which (anonymously) defines nothing else but what it derived from bar
• and finally, an instance, called "foo" is created,
• with an empty initializer list

struct : bar {} foo {};