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This manual is for FFTW
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(version 3.1.2, 23 June 2006).
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Copyright (C) 2003 Matteo Frigo.
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Copyright (C) 2003 Massachusetts Institute of Technology.
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<h4 class="subsection">4.6.1 Wisdom Export</h4>
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<pre class="example"> void fftw_export_wisdom_to_file(FILE *output_file);
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char *fftw_export_wisdom_to_string(void);
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void fftw_export_wisdom(void (*write_char)(char c, void *), void *data);
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<p><a name="index-fftw_005fexport_005fwisdom-261"></a><a name="index-fftw_005fexport_005fwisdom_005fto_005ffile-262"></a><a name="index-fftw_005fexport_005fwisdom_005fto_005fstring-263"></a>
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These functions allow you to export all currently accumulated wisdom
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in a form from which it can be later imported and restored, even
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during a separate run of the program. (See <a href="Words-of-Wisdom_002dSaving-Plans.html#Words-of-Wisdom_002dSaving-Plans">Words of Wisdom-Saving Plans</a>.) The current store of wisdom is not affected by calling any
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<p><code>fftw_export_wisdom</code> exports the wisdom to any output
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medium, as specified by the callback function
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<code>write_char</code>. <code>write_char</code> is a <code>putc</code>-like function that
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writes the character <code>c</code> to some output; its second parameter is
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the <code>data</code> pointer passed to <code>fftw_export_wisdom</code>. For
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convenience, the following two “wrapper” routines are provided:
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<p><code>fftw_export_wisdom_to_file</code> writes the wisdom to the
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current position in <code>output_file</code>, which should be open with write
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permission. Upon exit, the file remains open and is positioned at the
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end of the wisdom data.
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<p><code>fftw_export_wisdom_to_string</code> returns a pointer to a
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<code>NULL</code>-terminated string holding the wisdom data. This string is
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dynamically allocated, and it is the responsibility of the caller to
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deallocate it with <code>fftw_free</code> when it is no longer needed.
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<p>All of these routines export the wisdom in the same format, which we
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will not document here except to say that it is LISP-like ASCII text
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that is insensitive to white space.