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Current fftw source
author Chris Cannam <cannam@all-day-breakfast.com>
date Tue, 18 Oct 2016 13:40:26 +0100
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+<!-- This manual is for FFTW
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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>FFTW 3.3.5: Defining an FFTW module</title>
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+<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
+<link href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran" rel="up" title="Calling FFTW from Modern Fortran">
+<link href="Calling-FFTW-from-Legacy-Fortran.html#Calling-FFTW-from-Legacy-Fortran" rel="next" title="Calling FFTW from Legacy Fortran">
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+<a name="Defining-an-FFTW-module"></a>
+<div class="header">
+<p>
+Previous: <a href="Accessing-the-wisdom-API-from-Fortran.html#Accessing-the-wisdom-API-from-Fortran" accesskey="p" rel="prev">Accessing the wisdom API from Fortran</a>, Up: <a href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran" accesskey="u" rel="up">Calling FFTW from Modern Fortran</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
+</div>
+<hr>
+<a name="Defining-an-FFTW-module-1"></a>
+<h3 class="section">7.7 Defining an FFTW module</h3>
+
+<p>Rather than using the <code>include</code> statement to include the
+<code>fftw3.f03</code> 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
+<code>fftw3.f03</code> 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:
+</p>
+<div class="example">
+<pre class="example">  module FFTW3
+    use, intrinsic :: iso_c_binding
+    include 'fftw3.f03'
+  end module
+</pre></div>
+
+<p>Compile this file into a module as usual for your compiler (e.g. with
+<code>gfortran -c</code> you will get a file <code>fftw3.mod</code>).  Now,
+instead of <code>include 'fftw3.f03'</code>, whenever you want to use FFTW
+routines you can just do:
+</p>
+<div class="example">
+<pre class="example">  use FFTW3
+</pre></div>
+
+<p>as usual for Fortran modules.  (You still need to link to the FFTW
+library, of course.)
+</p>
+
+
+</body>
+</html>