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<title>Using the GNU Compiler Collection (GCC)</title>
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<h2 class="chapter">Extensions to the C++ Language</h2>
<p>The GNU compiler provides these extensions to the C++ language (and you
can also use most of the C language extensions in your C++ programs). If you
want to write code that checks whether these features are available, you can
test for the GNU compiler the same way as for C programs: check for a
predefined macro <code>__GNUC__</code>. You can also use <code>__GNUG__</code> to
test specifically for GNU C++ (see <a href="../cpp.info/Standard-Predefined.html#Standard%20Predefined">Standard Predefined Macros</a>).
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<li><a accesskey="1" href="Min-and-Max.html#Min%20and%20Max">Min and Max</a>: C++ Minimum and maximum operators.
<li><a accesskey="2" href="Volatiles.html#Volatiles">Volatiles</a>: What constitutes an access to a volatile object.
<li><a accesskey="3" href="Restricted-Pointers.html#Restricted%20Pointers">Restricted Pointers</a>: C99 restricted pointers and references.
<li><a accesskey="4" href="Vague-Linkage.html#Vague%20Linkage">Vague Linkage</a>: Where G++ puts inlines, vtables and such.
<li><a accesskey="5" href="C---Interface.html#C++%20Interface">C++ Interface</a>: You can use a single C++ header file for both
declarations and definitions.
<li><a accesskey="6" href="Template-Instantiation.html#Template%20Instantiation">Template Instantiation</a>: Methods for ensuring that exactly one copy of
each needed template instantiation is emitted.
<li><a accesskey="7" href="Bound-member-functions.html#Bound%20member%20functions">Bound member functions</a>: You can extract a function pointer to the
method denoted by a <code>->*</code> or <code>.*</code> expression.
<li><a accesskey="8" href="C---Attributes.html#C++%20Attributes">C++ Attributes</a>: Variable, function, and type attributes for C++ only.
<li><a accesskey="9" href="Java-Exceptions.html#Java%20Exceptions">Java Exceptions</a>: Tweaking exception handling to work with Java.
<li><a href="Deprecated-Features.html#Deprecated%20Features">Deprecated Features</a>: Things might disappear from g++.
<li><a href="Backwards-Compatibility.html#Backwards%20Compatibility">Backwards Compatibility</a>: Compatibilities with earlier definitions of C++.
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