Added enable_if library

[SVN r21090]

libs/libraries.htm

@@ -97,6 +97,7 @@ out how to build object libraries, when needed.</p>
       Walker.</li>
     <li><a href="date_time/doc/index.html">date_time</a> - Date-Time library from Jeff Garland.</li>
     <li><a href="dynamic_bitset/dynamic_bitset.html">dynamic_bitset</a> - A runtime sized version of <tt>std::bitset</tt> from Jeremy Siek and Chuck Allison.</li>
+    <li><a href="utility/enable_if.html">enable_if</a> - Selective inclusion of function template overloads, from Jaakko J&auml;rvi, Jeremiah Willcock, and Andrew Lumsdaine.</li>
     <li><a href="filesystem/doc/index.htm">filesystem</a> - Portable paths, 
     iteration over directories, and other useful filesystem operations, from 
     Beman Dawes.</li>
@@ -300,6 +301,9 @@ out how to build object libraries, when needed.</p>
         Howard Hinnant, et al.</li>
     <li><a href="concept_check/concept_check.htm">concept check</a>
         - Tools for generic programming, from Jeremy Siek.</li>
+    <li><a href="utility/enable_if.html">enable_if</a> - 
+	Selective inclusion of function template overloads, from Jaakko
+	J&auml;rvi, Jeremiah Willcock, and Andrew Lumsdaine.</li>
     <li><a href="utility/operators.htm">operators</a> - Templates
         ease arithmetic classes and iterators, from Dave Abrahams
         and Jeremy Siek.</li>
@@ -490,4 +494,4 @@ out how to build object libraries, when needed.</p>
 <!--webbot bot="Timestamp" s-type="EDITED"
 s-format="%d %b %Y" startspan -->26 Nov 2003<!--webbot bot="Timestamp" endspan i-checksum="15258" --></p>
 </body>
-</html>
+</html>

libs/utility

@@ -1 +1 @@
-Subproject commit abcab174a576fa81fa2423d13480014b8598fc4e
+Subproject commit 929517d6d74be5a645593bebe3cbd4ead1f4568a