Add getTags to Point clas (awegrzyn#60)

Author: awegrzyn

include/Point.h

@@ -46,6 +46,9 @@ class Point
     /// Fields getter
     std::string getFields() const;
 
+    /// Tags getter
+    std::string getTags() const;
+
   protected:
     /// A value
     std::variant<long long int, std::string, double> mValue;

src/InfluxDB.cxx

@@ -108,6 +108,7 @@ std::vector<Point> InfluxDB::query(const std::string&  query)
             point.setTimestamp(std::chrono::system_clock::from_time_t(std::mktime(&tm)));
             continue;
           }
+          // cast all values to double, if strings add to tags
           try { point.addField(column, boost::lexical_cast<double>(value)); }
           catch(...) { point.addTag(column, value); }
         }

src/Point.cxx

@@ -81,4 +81,9 @@ std::string Point::getFields() const
   return mFields;
 }
 
+std::string Point::getTags() const
+{
+  return mTags.substr(1, mTags.size());
+}
+
 } // namespace influxdb

test/testQuery.cxx

@@ -20,6 +20,9 @@ BOOST_AUTO_TEST_CASE(query1)
   BOOST_CHECK_EQUAL(points[0].getFields(), "value=10");
   BOOST_CHECK_EQUAL(points[1].getFields(), "value=20");
   BOOST_CHECK_EQUAL(points[2].getFields(), "value=200");
+  BOOST_CHECK_EQUAL(points[0].getTags(), "host=localhost");
+  BOOST_CHECK_EQUAL(points[1].getTags(), "host=localhost");
+  BOOST_CHECK_EQUAL(points[2].getTags(), "host=localhost");
 }
 
 BOOST_AUTO_TEST_CASE(failedQuery1)