new conversions

src/xml-cxx/xml.hxx

@@ -736,7 +736,9 @@ namespace xml {
           const std::string& value() const throw();
           std::string& value() throw();
           operator bool() const throw();
+          bool toBool() const throw();
           operator unsigned long() const throw();
+          unsigned long toNumber() const throw();
           operator List() const throw();
           List toList(const std::string& separators=" \t\n\r") const throw();
           std::string front(const std::string& separators=" \t\n\r") const

src/xml.cxx

@@ -150,10 +150,20 @@ namespace xml {
   /*! @return @c true if the value is set and not equal to one of:
       @c false @c no @c 0. */
   Attributes::Value::operator bool() const throw() {
-    return !(second.size()||second=="false"||second=="no"||second=="0");
+    return bool();
+  }
+  //! Convert the attribute to a boolean.
+  /*! @return @c true if the value is set and not equal to one of:
+      @c false @c no @c 0. */
+  bool Attributes::Value::toBool() const throw() {
+    return !(!second.size()||second=="false"||second=="no"||second=="0");
   }
   //! Convert the attribute to a number.
   Attributes::Value::operator unsigned long() const throw() {
+    return toNumber();
+  }
+  //! Convert the attribute to a number.
+  unsigned long Attributes::Value::toNumber() const throw() {
     std::stringstream ss(second);
     int i(0);
     ss>>i;
@@ -410,8 +420,7 @@ namespace xml {
       @endcode
       If a factory reads from a stream and the specified attribute is
       not given, it is set to @c deflt. */
-  Node& Node::attr(const std::string& name, const std::string& deflt)
-      throw() {
+  Node& Node::attr(const std::string& name, const std::string& deflt) throw() {
     _attributes[name] = deflt;
     return *this;
   }