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<title>FFTW 3.3.8: Calling FFTW from Modern Fortran</title>

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Next: <a href="Calling-FFTW-from-Legacy-Fortran.html#Calling-FFTW-from-Legacy-Fortran" accesskey="n" rel="next">Calling FFTW from Legacy Fortran</a>, Previous: <a href="Distributed_002dmemory-FFTW-with-MPI.html#Distributed_002dmemory-FFTW-with-MPI" accesskey="p" rel="prev">Distributed-memory FFTW with MPI</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</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>
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<a name="Calling-FFTW-from-Modern-Fortran-1"></a>
<h2 class="chapter">7 Calling FFTW from Modern Fortran</h2>
<a name="index-Fortran-interface-2"></a>

<p>Fortran 2003 standardized ways for Fortran code to call C libraries,
and this allows us to support a direct translation of the FFTW C API
into Fortran.  Compared to the legacy Fortran 77 interface
(see <a href="Calling-FFTW-from-Legacy-Fortran.html#Calling-FFTW-from-Legacy-Fortran">Calling FFTW from Legacy Fortran</a>), this direct interface
offers many advantages, especially compile-time type-checking and
aligned memory allocation.  As of this writing, support for these C
interoperability features seems widespread, having been implemented in
nearly all major Fortran compilers (e.g. GNU, Intel, IBM,
Oracle/Solaris, Portland Group, NAG).
<a name="index-portability-4"></a>
</p>
<p>This chapter documents that interface.  For the most part, since this
interface allows Fortran to call the C interface directly, the usage
is identical to C translated to Fortran syntax.  However, there are a
few subtle points such as memory allocation, wisdom, and data types
that deserve closer attention.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">&bull; <a href="Overview-of-Fortran-interface.html#Overview-of-Fortran-interface" accesskey="1">Overview of Fortran interface</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Reversing-array-dimensions.html#Reversing-array-dimensions" accesskey="2">Reversing array dimensions</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="FFTW-Fortran-type-reference.html#FFTW-Fortran-type-reference" accesskey="3">FFTW Fortran type reference</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Plan-execution-in-Fortran.html#Plan-execution-in-Fortran" accesskey="4">Plan execution in Fortran</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Allocating-aligned-memory-in-Fortran.html#Allocating-aligned-memory-in-Fortran" accesskey="5">Allocating aligned memory in Fortran</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Accessing-the-wisdom-API-from-Fortran.html#Accessing-the-wisdom-API-from-Fortran" accesskey="6">Accessing the wisdom API from Fortran</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Defining-an-FFTW-module.html#Defining-an-FFTW-module" accesskey="7">Defining an FFTW module</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
</table>


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author	Chris Cannam <cannam@all-day-breakfast.com>
date	Tue, 19 Nov 2019 14:52:55 +0000
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