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<h2 class="chapter">7 Calling FFTW from Modern Fortran</h2>
<p><a name="index-Fortran-interface-500"></a>
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-501"></a>
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.
<ul class="menu">
<li><a accesskey="1" href="Overview-of-Fortran-interface.html#Overview-of-Fortran-interface">Overview of Fortran interface</a>
<li><a accesskey="2" href="Reversing-array-dimensions.html#Reversing-array-dimensions">Reversing array dimensions</a>
<li><a accesskey="3" href="FFTW-Fortran-type-reference.html#FFTW-Fortran-type-reference">FFTW Fortran type reference</a>
<li><a accesskey="4" href="Plan-execution-in-Fortran.html#Plan-execution-in-Fortran">Plan execution in Fortran</a>
<li><a accesskey="5" href="Allocating-aligned-memory-in-Fortran.html#Allocating-aligned-memory-in-Fortran">Allocating aligned memory in Fortran</a>
<li><a accesskey="6" href="Accessing-the-wisdom-API-from-Fortran.html#Accessing-the-wisdom-API-from-Fortran">Accessing the wisdom API from Fortran</a>
<li><a accesskey="7" href="Defining-an-FFTW-module.html#Defining-an-FFTW-module">Defining an FFTW module</a>
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