12.2.51 upgraded-complex-part-type [Function]

upgraded-complex-part-type typespec &optional environment ⇒ upgraded-typespec

Arguments and Values::

typespec—a type specifier.

environment—an environment object. The default is nil, denoting the null lexical environment and the and current global environment.

upgraded-typespec—a type specifier.

Description::

upgraded-complex-part-type returns the part type of the most specialized complex number representation that can hold parts of type typespec.

The typespec is a subtype of (and possibly type equivalent to) the upgraded-typespec.

The purpose of upgraded-complex-part-type is to reveal how an implementation does its upgrading.

See Also::

complex (function and type)

Notes::