optional_optimization branch

[SVN r77091]

doc/html/index.html

@@ -37,7 +37,7 @@ can be deduced from their types.</p>
 </tbody>
 </table>
 <!-- @jam_prefix.append('''
-project test : requirements <include>. <implicit-dependency>/boost//headers ;''') -->
+project test : requirements <include>. <source>/boost//headers ;''') -->
 <!-- @example.prepend('''
 #include <boost/parameter.hpp>
 

doc/index.rst

@@ -30,7 +30,7 @@ __ ../../../../index.htm
   can be deduced from their types.
 
 .. @jam_prefix.append('''
-        project test : requirements <include>. <implicit-dependency>/boost//headers ;''')
+        project test : requirements <include>. <source>/boost//headers ;''')
 
 .. @example.prepend('''
    #include <boost/parameter.hpp>

include/boost/parameter/aux_/tagged_argument.hpp

@@ -120,13 +120,13 @@ struct tagged_argument : tagged_argument_base
     }
 # else
     template <class Default>
-    reference operator[](default_<key_type,Default> const& ) const
+    reference operator[](default_<key_type,Default> const& x) const
     {
         return value;
     }
 
     template <class F>
-    reference operator[](lazy_default<key_type,F> const& ) const
+    reference operator[](lazy_default<key_type,F> const& x) const
     {
         return value;
     }