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+<a name="Restricting-Pointer-Aliasing"></a>
+<h3 class="section">7.2 Restricting Pointer Aliasing</h3>
+<a name="index-restricted-pointers"></a>
+<a name="index-restricted-references"></a>
+<a name="index-restricted-this-pointer"></a>
+
+<p>As with the C front end, G++ understands the C99 feature of restricted pointers,
+specified with the <code>__restrict__</code>, or <code>__restrict</code> type
+qualifier.  Because you cannot compile C++ by specifying the <samp>-std=c99</samp>
+language flag, <code>restrict</code> is not a keyword in C++.
+</p>
+<p>In addition to allowing restricted pointers, you can specify restricted
+references, which indicate that the reference is not aliased in the local
+context.
+</p>
+<div class="smallexample">
+<pre class="smallexample">void fn (int *__restrict__ rptr, int &amp;__restrict__ rref)
+{
+  /* <span class="roman">&hellip;</span> */
+}
+</pre></div>
+
+<p>In the body of <code>fn</code>, <var>rptr</var> points to an unaliased integer and
+<var>rref</var> refers to a (different) unaliased integer.
+</p>
+<p>You may also specify whether a member function&rsquo;s <var>this</var> pointer is
+unaliased by using <code>__restrict__</code> as a member function qualifier.
+</p>
+<div class="smallexample">
+<pre class="smallexample">void T::fn () __restrict__
+{
+  /* <span class="roman">&hellip;</span> */
+}
+</pre></div>
+
+<p>Within the body of <code>T::fn</code>, <var>this</var> has the effective
+definition <code>T *__restrict__ const this</code>.  Notice that the
+interpretation of a <code>__restrict__</code> member function qualifier is
+different to that of <code>const</code> or <code>volatile</code> qualifier, in that it
+is applied to the pointer rather than the object.  This is consistent with
+other compilers that implement restricted pointers.
+</p>
+<p>As with all outermost parameter qualifiers, <code>__restrict__</code> is
+ignored in function definition matching.  This means you only need to
+specify <code>__restrict__</code> in a function definition, rather than
+in a function prototype as well.
+</p>
+
+
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