23 General utilities library [utilities]

23.14 Function objects [function.objects]

23.14.2 Definitions [func.def]

The following definitions apply to this Clause:

A call signature is the name of a return type followed by a parenthesized comma-separated list of zero or more argument types.

A callable type is a function object type or a pointer to member.

A callable object is an object of a callable type.

A call wrapper type is a type that holds a callable object and supports a call operation that forwards to that object.

A call wrapper is an object of a call wrapper type.

A target object is the callable object held by a call wrapper.