Derived_Types

 Like intrinsic data types, a Fortran 95/90 derived data type has a
 name, a set of associated values, a way to denote the values, and
 operations to manipulate and interpret these values.

 The names of the intrinsic data types are predefined, while the
 names of derived types are defined in derived-type definitions.

 A derived-type definition specifies the name of the type and the
 types of its components.  A derived type can be resolved into
 "ultimate" components that are either of intrinsic type or are
 pointers.

 The set of values for a specific derived type consists of all
 possible sequences of component values permitted by the definition
 of that derived type.  Structure constructors are used to specify
 values of derived types.

 Nonintrinsic assignment for derived-type entities must be defined
 by a subroutine with an ASSIGNMENT interface.  Any operation on
 derived-type entities must be defined by a function with an
 OPERATOR interface.  Arguments and function values can be of any
 intrinsic or derived type.

Additional information available:

Type_Definitions                Components      Constructors