Defines an abstract type which cannot be instantiated, but can be used as a base class. Syntax pure

Specifies that a non-static member function

For an unqualified name, that is a name that does not appear to the right of a scope resolution operator ::, name lookup examines the

Queries the number of elements in a parameter pack

Establishes an exception handler around the body of a function. Syntax The function-try-block is one of

Causes the enclosing for,

Declarations introduce (or re-introduce) names into the C++ program. Each kind of entity is declared differently.

A constructor that is not declared with the specifier explicit

Transfers control to one of the several statements, depending on the value of a condition. Syntax

Definitions are declarations that fully define