Info Catalog fftw3: Accessing the wisdom API from Fortran fftw3: Calling FFTW from Modern Fortran

fftw3: Defining an FFTW module

 
 7.7 Defining an FFTW module
 ===========================
 
 Rather than using the 'include' statement to include the 'fftw3.f03'
 interface file in any subroutine where you want to use FFTW, you might
 prefer to define an FFTW Fortran module.  FFTW does not install itself
 as a module, primarily because 'fftw3.f03' can be shared between
 different Fortran compilers while modules (in general) cannot.  However,
 it is trivial to define your own FFTW module if you want.  Just create a
 file containing:
 
        module FFTW3
          use, intrinsic :: iso_c_binding
          include 'fftw3.f03'
        end module
 
    Compile this file into a module as usual for your compiler (e.g.
 with 'gfortran -c' you will get a file 'fftw3.mod').  Now, instead of
 'include 'fftw3.f03'', whenever you want to use FFTW routines you can
 just do:
 
        use FFTW3
 
    as usual for Fortran modules.  (You still need to link to the FFTW
 library, of course.)
 

Info Catalog fftw3: Accessing the wisdom API from Fortran fftw3: Calling FFTW from Modern Fortran