A procedure must have an explicit interface in the following cases:
- If the procedure has any of the following:
- An optional dummy argument
- A dummy argument that is an assumed-shape array, a
pointer, or a target
- A result that is array-valued or a pointer (functions
- A result whose length is neither assumed nor a constant
(character functions only)
- A dummy argument that appears in a
High Performance Fortran (HPF) data mapping directive
- If a reference to the procedure appears as follows:
- With an argument keyword
- As a reference by its generic name
- As a defined assignment (subroutines only)
- In an expression as a defined operator (functions only)
- In a context that requires it to be
- If the procedure is elemental
For More Information:
- On optional arguments, see Section 8.8.1.
- On argument keywords in subroutine references, see
- On argument keywords in function references, see
- On user-defined generic procedures, see
- On defined operators, see
- On defined assignment, see
- On array arguments, see Section 8.8.2.
- On pointer arguments, see Section 8.8.3.
- On pure procedures, see Section 18.104.22.168.
- On elemental procedures, see Section 22.214.171.124.
- On explicit interfaces when calling other languages, see
your user manual or programmer's guide.
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