A derived-type definition specifies the name of a user-defined type and the types of its components. It takes the following form:
The first component definition can be preceded by an optional PRIVATE or SEQUENCE statement. (Only one PRIVATE or SEQUENCE statement can appear in a given derived-type definition.)
PRIVATE specifies that the components are accessible only within the defining module, even if the derived type itself is public.
SEQUENCE cause the components of the derived type to be stored in the same sequence they are listed in the type definition. If SEQUENCE is specified, all derived types specified in component definitions must be sequence types.
A component definition takes the following form:
The POINTER or DIMENSION attribute can only appear once in a given component-definition.
If the array bounds are not specified here, they must be specified following the DIMENSION attribute.
If init-ex is specified, a double colon must appear in the component definition. The equals assignment symbol (=) can only be specified for nonpointer components.
The initialization expression is evaluated in the scoping unit of the type definition.
Rules and Behavior
If a name is specified following the END TYPE statement, it must be the same name that follows TYPE in the derived type statement.
A derived type can be defined only once in a scoping unit. If the same derived-type name appears in a derived-type definition in another scoping unit, it is treated independently.
A component name has the scope of the derived-type definition only. Therefore, the same name can be used in another derived-type definition in the same scoping unit.
Two data entities have the same type if they are both declared to be of the same derived type (the derived-type definition can be accessed from a module or a host scoping unit).
If the entities are in different scoping units, they can also have the same derived type if they are declared with reference to different derived-type definitions, and if both derived-type definitions have all of the following:
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