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<title>The GNU Fortran Compiler: ISO_C_BINDING</title>
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<a name="ISO_005fC_005fBINDING"></a>
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<div class="header">
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<p>
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Next: <a href="IEEE-modules.html#IEEE-modules" accesskey="n" rel="next">IEEE modules</a>, Previous: <a href="ISO_005fFORTRAN_005fENV.html#ISO_005fFORTRAN_005fENV" accesskey="p" rel="prev">ISO_FORTRAN_ENV</a>, Up: <a href="Intrinsic-Modules.html#Intrinsic-Modules" accesskey="u" rel="up">Intrinsic Modules</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="ISO_005fC_005fBINDING-1"></a>
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<h3 class="section">10.2 <code>ISO_C_BINDING</code></h3>
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<dl compact="compact">
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<dt><em>Standard</em>:</dt>
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<dd><p>Fortran 2003 and later, GNU extensions
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</p></dd>
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</dl>
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<p>The following intrinsic procedures are provided by the module; their
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definition can be found in the section Intrinsic Procedures of this
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manual.
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</p>
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<dl compact="compact">
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<dt><code>C_ASSOCIATED</code></dt>
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<dt><code>C_F_POINTER</code></dt>
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<dt><code>C_F_PROCPOINTER</code></dt>
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<dt><code>C_FUNLOC</code></dt>
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<dt><code>C_LOC</code></dt>
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<dt><code>C_SIZEOF</code></dt>
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</dl>
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<p>The <code>ISO_C_BINDING</code> module provides the following named constants of
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type default integer, which can be used as KIND type parameters.
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</p>
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<p>In addition to the integer named constants required by the Fortran 2003
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standard and <code>C_PTRDIFF_T</code> of TS 29113, GNU Fortran provides as an
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extension named constants for the 128-bit integer types supported by the
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C compiler: <code>C_INT128_T, C_INT_LEAST128_T, C_INT_FAST128_T</code>.
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Furthermore, if <code>__float128</code> is supported in C, the named constants
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<code>C_FLOAT128, C_FLOAT128_COMPLEX</code> are defined.
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</p>
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<table>
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<tr><td width="15%">Fortran Type</td><td width="35%">Named constant</td><td width="35%">C type</td><td width="35%">Extension</td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INT</code></td><td width="35%"><code>int</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_SHORT</code></td><td width="35%"><code>short int</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_LONG</code></td><td width="35%"><code>long int</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_LONG_LONG</code></td><td width="35%"><code>long long int</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_SIGNED_CHAR</code></td><td width="35%"><code>signed char</code>/<code>unsigned char</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_SIZE_T</code></td><td width="35%"><code>size_t</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INT8_T</code></td><td width="35%"><code>int8_t</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INT16_T</code></td><td width="35%"><code>int16_t</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INT32_T</code></td><td width="35%"><code>int32_t</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INT64_T</code></td><td width="35%"><code>int64_t</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INT128_T</code></td><td width="35%"><code>int128_t</code></td><td width="35%">Ext.</td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INT_LEAST8_T</code></td><td width="35%"><code>int_least8_t</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INT_LEAST16_T</code></td><td width="35%"><code>int_least16_t</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INT_LEAST32_T</code></td><td width="35%"><code>int_least32_t</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INT_LEAST64_T</code></td><td width="35%"><code>int_least64_t</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INT_LEAST128_T</code></td><td width="35%"><code>int_least128_t</code></td><td width="35%">Ext.</td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INT_FAST8_T</code></td><td width="35%"><code>int_fast8_t</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INT_FAST16_T</code></td><td width="35%"><code>int_fast16_t</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INT_FAST32_T</code></td><td width="35%"><code>int_fast32_t</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INT_FAST64_T</code></td><td width="35%"><code>int_fast64_t</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INT_FAST128_T</code></td><td width="35%"><code>int_fast128_t</code></td><td width="35%">Ext.</td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INTMAX_T</code></td><td width="35%"><code>intmax_t</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_INTPTR_T</code></td><td width="35%"><code>intptr_t</code></td></tr>
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<tr><td width="15%"><code>INTEGER</code></td><td width="35%"><code>C_PTRDIFF_T</code></td><td width="35%"><code>intptr_t</code></td><td width="35%">TS 29113</td></tr>
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<tr><td width="15%"><code>REAL</code></td><td width="35%"><code>C_FLOAT</code></td><td width="35%"><code>float</code></td></tr>
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<tr><td width="15%"><code>REAL</code></td><td width="35%"><code>C_DOUBLE</code></td><td width="35%"><code>double</code></td></tr>
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<tr><td width="15%"><code>REAL</code></td><td width="35%"><code>C_LONG_DOUBLE</code></td><td width="35%"><code>long double</code></td></tr>
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<tr><td width="15%"><code>REAL</code></td><td width="35%"><code>C_FLOAT128</code></td><td width="35%"><code>__float128</code></td><td width="35%">Ext.</td></tr>
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<tr><td width="15%"><code>COMPLEX</code></td><td width="35%"><code>C_FLOAT_COMPLEX</code></td><td width="35%"><code>float _Complex</code></td></tr>
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<tr><td width="15%"><code>COMPLEX</code></td><td width="35%"><code>C_DOUBLE_COMPLEX</code></td><td width="35%"><code>double _Complex</code></td></tr>
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<tr><td width="15%"><code>COMPLEX</code></td><td width="35%"><code>C_LONG_DOUBLE_COMPLEX</code></td><td width="35%"><code>long double _Complex</code></td></tr>
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<tr><td width="15%"><code>REAL</code></td><td width="35%"><code>C_FLOAT128_COMPLEX</code></td><td width="35%"><code>__float128 _Complex</code></td><td width="35%">Ext.</td></tr>
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<tr><td width="15%"><code>LOGICAL</code></td><td width="35%"><code>C_BOOL</code></td><td width="35%"><code>_Bool</code></td></tr>
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<tr><td width="15%"><code>CHARACTER</code></td><td width="35%"><code>C_CHAR</code></td><td width="35%"><code>char</code></td></tr>
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</table>
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<p>Additionally, the following parameters of type <code>CHARACTER(KIND=C_CHAR)</code>
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are defined.
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</p>
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<table>
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<tr><td width="20%">Name</td><td width="45%">C definition</td><td width="15%">Value</td></tr>
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<tr><td width="20%"><code>C_NULL_CHAR</code></td><td width="45%">null character</td><td width="15%"><code>'\0'</code></td></tr>
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<tr><td width="20%"><code>C_ALERT</code></td><td width="45%">alert</td><td width="15%"><code>'\a'</code></td></tr>
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<tr><td width="20%"><code>C_BACKSPACE</code></td><td width="45%">backspace</td><td width="15%"><code>'\b'</code></td></tr>
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<tr><td width="20%"><code>C_FORM_FEED</code></td><td width="45%">form feed</td><td width="15%"><code>'\f'</code></td></tr>
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<tr><td width="20%"><code>C_NEW_LINE</code></td><td width="45%">new line</td><td width="15%"><code>'\n'</code></td></tr>
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<tr><td width="20%"><code>C_CARRIAGE_RETURN</code></td><td width="45%">carriage return</td><td width="15%"><code>'\r'</code></td></tr>
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<tr><td width="20%"><code>C_HORIZONTAL_TAB</code></td><td width="45%">horizontal tab</td><td width="15%"><code>'\t'</code></td></tr>
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<tr><td width="20%"><code>C_VERTICAL_TAB</code></td><td width="45%">vertical tab</td><td width="15%"><code>'\v'</code></td></tr>
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</table>
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<p>Moreover, the following two named constants are defined:
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</p>
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<table>
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<tr><td width="20%">Name</td><td width="80%">Type</td></tr>
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<tr><td width="20%"><code>C_NULL_PTR</code></td><td width="80%"><code>C_PTR</code></td></tr>
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<tr><td width="20%"><code>C_NULL_FUNPTR</code></td><td width="80%"><code>C_FUNPTR</code></td></tr>
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</table>
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<p>Both are equivalent to the value <code>NULL</code> in C.
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</p>
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Next: <a href="IEEE-modules.html#IEEE-modules" accesskey="n" rel="next">IEEE modules</a>, Previous: <a href="ISO_005fFORTRAN_005fENV.html#ISO_005fFORTRAN_005fENV" accesskey="p" rel="prev">ISO_FORTRAN_ENV</a>, Up: <a href="Intrinsic-Modules.html#Intrinsic-Modules" accesskey="u" rel="up">Intrinsic Modules</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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