100 lines
4.1 KiB
HTML
100 lines
4.1 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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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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Permission is granted to make and distribute verbatim copies of this
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manual provided the copyright notice and this permission notice are
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preserved on all copies.
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Permission is granted to copy and distribute modified versions of this
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manual under the conditions for verbatim copying, provided that the
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entire resulting derived work is distributed under the terms of a
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permission notice identical to this one.
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Permission is granted to copy and distribute translations of this manual
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into another language, under the above conditions for modified versions,
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except that this permission notice may be stated in a translation
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approved by the Free Software Foundation. -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>Defining an FFTW module (FFTW 3.3.10)</title>
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<meta name="description" content="Defining an FFTW module (FFTW 3.3.10)">
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<link href="index.html" rel="start" title="Top">
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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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<link href="Calling-FFTW-from-Legacy-Fortran.html" rel="next" title="Calling FFTW from Legacy Fortran">
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<link href="Wisdom-Generic-Export_002fImport-from-Fortran.html" rel="prev" title="Wisdom Generic Export/Import from Fortran">
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</head>
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<body lang="en">
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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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</body>
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</html>
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