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fftw3: FFTW Constants in Fortran

 
 8.2 FFTW Constants in Fortran
 =============================
 
 When creating plans in FFTW, a number of constants are used to specify
 options, such as 'FFTW_MEASURE' or 'FFTW_ESTIMATE'.  The same constants
 must be used with the wrapper routines, but of course the C header files
 where the constants are defined can't be incorporated directly into
 Fortran code.
 
    Instead, we have placed Fortran equivalents of the FFTW constant
 definitions in the file 'fftw3.f', which can be found in the same
 directory as 'fftw3.h'.  If your Fortran compiler supports a
 preprocessor of some sort, you should be able to 'include' or '#include'
 this file; otherwise, you can paste it directly into your code.
 
    In C, you combine different flags (like 'FFTW_PRESERVE_INPUT' and
 'FFTW_MEASURE') using the ''|'' operator; in Fortran you should just use
 ''+''.  (Take care not to add in the same flag more than once, though.
 Alternatively, you can use the 'ior' intrinsic function standardized in
 Fortran 95.)
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