Test if an object is a price index

Test if an object is a index object or a subclass of an index object.

Usage

is_index(x)

is_chainable_index(x)

is_direct_index(x)

Arguments

x

An object to test.

Value

is_index() returns TRUE if x inherits from piar_index.

is_chainable_index() returns TRUE if x inherits from chainable_piar_index.

is_direct_index() returns TRUE if x inherits from direct_piar_index.