Added handy parameter inspect operator[].

git-svn-id: http://voip.null.ro/svn/yate@1706 acf43c95-373e-0410-b603-e72c3f656dc1

engine/NamedList.cpp

@@ -195,6 +195,12 @@ NamedString* NamedList::getParam(unsigned int index) const
     return static_cast<NamedString *>(m_params[index]);
 }
 
+const String& NamedList::operator[](const String& name) const
+{
+    const String* s = getParam(name);
+    return s ? *s : String::empty();
+}
+
 const char* NamedList::getValue(const String& name, const char* defvalue) const
 {
     XDebug(DebugInfo,"NamedList::getValue(\"%s\",\"%s\")",name.c_str(),defvalue);

yateclass.h

@@ -3008,6 +3008,13 @@ public:
      */
     NamedString* getParam(unsigned int index) const;
 
+    /**
+     * Parameter access operator
+     * @param name Name of the parameter to return
+     * @return String value of the parameter, @ref String::empty() if missing
+     */
+    const String& operator[](const String& name) const;
+
     /**
      * Retrive the value of a named parameter.
      * @param name Name of parameter to locate