Is there any recommendation/document describing the PURE functions and procedures? To be precise, I am looking for the set of instrinsic functions that can be the part of; and must not be the part of PURE functions. Thanks!
I get plenty of answers, e.g. with search string "Fortran pure intrinsics" Most search engines will even correct spelling.
The Intel Fortran documentation for the PURE keyword gives the rules, as does the Fortran standard.
You can also use the book by Metcalf c.s. : "Modern Fortran explained" , esp. section 6.10