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<!-- This manual is for FFTW
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(version 3.3.10, 10 December 2020).
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Copyright (C) 2003 Matteo Frigo.
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Copyright (C) 2003 Massachusetts Institute of Technology.
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<title>Defining an FFTW module (FFTW 3.3.10)</title>
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Calling-FFTW-from-Modern-Fortran.html" rel="up" title="Calling FFTW from Modern Fortran">
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<span id="Defining-an-FFTW-module"></span><div class="header">
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<p>
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Previous: <a href="Accessing-the-wisdom-API-from-Fortran.html" accesskey="p" rel="prev">Accessing the wisdom API from Fortran</a>, Up: <a href="Calling-FFTW-from-Modern-Fortran.html" accesskey="u" rel="up">Calling FFTW from Modern Fortran</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<span id="Defining-an-FFTW-module-1"></span><h3 class="section">7.7 Defining an FFTW module</h3>
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<p>Rather than using the <code>include</code> statement to include the
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<code>fftw3.f03</code> interface file in any subroutine where you want to
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use FFTW, you might prefer to define an FFTW Fortran module. FFTW
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does not install itself as a module, primarily because
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<code>fftw3.f03</code> can be shared between different Fortran compilers while
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modules (in general) cannot. However, it is trivial to define your
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own FFTW module if you want. Just create a file containing:
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</p>
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<div class="example">
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<pre class="example"> module FFTW3
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use, intrinsic :: iso_c_binding
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include 'fftw3.f03'
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end module
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</pre></div>
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<p>Compile this file into a module as usual for your compiler (e.g. with
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<code>gfortran -c</code> you will get a file <code>fftw3.mod</code>). Now,
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instead of <code>include 'fftw3.f03'</code>, whenever you want to use FFTW
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routines you can just do:
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</p>
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<div class="example">
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<pre class="example"> use FFTW3
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</pre></div>
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<p>as usual for Fortran modules. (You still need to link to the FFTW
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library, of course.)
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</p>
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