Add Optional

[SVN r17017]

index.htm

@@ -169,6 +169,9 @@
                   <li><a href="libs/filesystem/doc/index.htm">Filesystem Library</a> 
                   added - Portable paths, iteration over directories, and other 
                   useful filesystem operations, from Beman Dawes.</li>
+                  <li><a href="libs/optional/doc/optional.html">Optional Library</a> 
+                  added - A discriminated-union wrapper for optional values, 
+                  from Fernando Cacciola.</li>
                   <li><a href="libs/numeric/interval/doc/interval.htm">Interval 
                   Library</a> added - Extends the usual arithmetic functions to 
                   mathematical intervals, from Guillaume Melquiond, Hervé 
@@ -384,6 +387,6 @@
     <hr>
 
     <p>Revised 
-    <!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->21 January, 2003<!--webbot bot="Timestamp" endspan i-checksum="38568" --></p>
+    <!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->23 January, 2003<!--webbot bot="Timestamp" endspan i-checksum="38572" --></p>
   </body>
 </html>

libs/libraries.htm

@@ -145,6 +145,8 @@ out how to build object libraries, when needed.</p>
     <li><a href="utility/operators.htm">operators</a> - Templates
         ease arithmetic classes and iterators, from Dave Abrahams
         and Jeremy Siek.</li>
+    <li><a href="optional/doc/optional.html">optional</a> - Discriminated-union 
+    wrapper for optional values, from Fernando Cacciola.</li>
     <li><a href="pool/doc/index.html">pool</a> - Memory pool management, from
       Steve Cleary.</li>
     <li><a href="preprocessor/doc/index.html">preprocessor</a> - Preprocessor 
@@ -441,6 +443,8 @@ out how to build object libraries, when needed.</p>
     <li><a href="filesystem/doc/index.htm">filesystem</a> - Portable paths, 
     iteration over directories, and other useful filesystem operations, from 
     Beman Dawes.</li>
+    <li><a href="optional/doc/optional.html">optional</a> - Discriminated-union 
+    wrapper for optional values, from Fernando Cacciola.</li>
     <li><a href="timer/index.htm">timer</a> - Event timer,
         progress timer, and progress display classes, from Beman
         Dawes.</li>
@@ -477,6 +481,6 @@ out how to build object libraries, when needed.</p>
 
 <p>Revised 
 <!--webbot bot="Timestamp" s-type="EDITED"
-s-format="%d %b %Y" startspan -->21 Jan 2003<!--webbot bot="Timestamp" endspan i-checksum="14736" --></p>
+s-format="%d %b %Y" startspan -->23 Jan 2003<!--webbot bot="Timestamp" endspan i-checksum="14740" --></p>
 </body>
 </html>