ntnameValue: extra fields can be added now

src/nt/ntnameValue.cpp

@@ -46,6 +46,10 @@ StructureConstPtr NTNameValueBuilder::createStructure()
     if (timeStamp)
         builder->add("timeStamp", ntField->createTimeStamp());
 
+    size_t extraCount = extraFieldNames.size();
+    for (size_t i = 0; i< extraCount; i++)
+        builder->add(extraFieldNames[i], extraFields[i]);
+
     StructureConstPtr s = builder->createStructure();
 
     reset();
@@ -91,8 +95,17 @@ void NTNameValueBuilder::reset()
     descriptor = false;
     alarm = false;
     timeStamp = false;
+    extraFieldNames.clear();
+    extraFields.clear();
 }
 
+NTNameValueBuilder::shared_pointer NTNameValueBuilder::add(string const & name, FieldConstPtr const & field)
+{
+    extraFields.push_back(field); extraFieldNames.push_back(name);
+    return shared_from_this();
+}
+
+
 }
 
 const std::string NTNameValue::URI("uri:ev4:nt/2012/pwd:NTNameValue");

src/nt/ntnameValue.h

@@ -74,6 +74,14 @@ namespace detail {
          */
         NTNameValuePtr create();
 
+        /**
+         * Add extra {@code Field} to the type.
+         * @param name name of the field.
+         * @param field a field to add.
+         * @return this instance of a {@code NTNameValueBuilder}.
+         */
+        shared_pointer add(std::string const & name, epics::pvData::FieldConstPtr const & field);
+
     private:
         NTNameValueBuilder();
 
@@ -86,6 +94,10 @@ namespace detail {
         bool alarm;
         bool timeStamp;
 
+        // NOTE: this preserves order, however it does not handle duplicates
+        epics::pvData::StringArray extraFieldNames;
+        epics::pvData::FieldConstPtrArray extraFields;
+
         friend class ::epics::nt::NTNameValue;
     };