fixed possible SEGFAULT in ceateRequest; new stream operator for Field and PVField

src/pv/pvData.h

@@ -1565,6 +1565,14 @@ private:
 epicsShareExtern PVDataCreatePtr getPVDataCreate();
 
 }}
+
+/**
+ * stream support for pvField
+ */
+namespace std{
+    std::ostream& operator<<(std::ostream& o, const epics::pvData::PVField *ptr);
+}
+
 #endif  /* PVDATA_H */
 
 /** @page Overview Documentation

src/pv/pvIntrospect.h

@@ -1220,4 +1220,12 @@ struct StructureArrayHashFunction {
 };
 
 }}
+
+/**
+ * stream support for Field
+ */
+namespace std{
+    std::ostream& operator<<(std::ostream& o, const epics::pvData::Field *ptr);
+}
+
 #endif  /* PVINTROSPECT_H */