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Current fftw source
author Chris Cannam
date Tue, 18 Oct 2016 13:40:26 +0100
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78 <a name="Defining-an-FFTW-module-1"></a>
79 <h3 class="section">7.7 Defining an FFTW module</h3>
80
81 <p>Rather than using the <code>include</code> statement to include the
82 <code>fftw3.f03</code> interface file in any subroutine where you want to
83 use FFTW, you might prefer to define an FFTW Fortran module. FFTW
84 does not install itself as a module, primarily because
85 <code>fftw3.f03</code> can be shared between different Fortran compilers while
86 modules (in general) cannot. However, it is trivial to define your
87 own FFTW module if you want. Just create a file containing:
88 </p>
89 <div class="example">
90 <pre class="example"> module FFTW3
91 use, intrinsic :: iso_c_binding
92 include 'fftw3.f03'
93 end module
94 </pre></div>
95
96 <p>Compile this file into a module as usual for your compiler (e.g. with
97 <code>gfortran -c</code> you will get a file <code>fftw3.mod</code>). Now,
98 instead of <code>include 'fftw3.f03'</code>, whenever you want to use FFTW
99 routines you can just do:
100 </p>
101 <div class="example">
102 <pre class="example"> use FFTW3
103 </pre></div>
104
105 <p>as usual for Fortran modules. (You still need to link to the FFTW
106 library, of course.)
107 </p>
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