Derived type
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For types constructed from primitive and other types, see composite type.
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A derived type is a type given a new type but structurally the same as the original type. The purpose of this type is to create a new type name so that two values can have two distinct types in terms of name. This type matters if the type system uses a name equivalence rule (nominative type system) but does not matter if the system uses a structural equivalence (structural type system).
In C and C++, typedef can be used to create a derived type, like so:
typedef int timestamp;
(Here, timestamp is a type derived from int.)
See also: subtype.
