Try changing heatingDryBulb99 to boost::optional.

src/utilities/filetypes/EpwFile.cpp

@@ -2668,8 +2668,8 @@ double EpwDesignCondition::heatingDryBulb99pt6() const {
   return m_heatingDryBulb99pt6;
 }
 
-double EpwDesignCondition::heatingDryBulb99() const {
-  return m_heatingDryBulb99;
+boost::optional<double> EpwDesignCondition::heatingDryBulb99() const {
+  return boost::optional<double>(m_heatingDryBulb99);
 }
 
 double EpwDesignCondition::heatingHumidificationDewPoint99pt6() const {
@@ -2941,7 +2941,11 @@ void EpwDesignCondition::setHeatingDryBulb99pt6(double heatingDryBulb99pt6) {
 bool EpwDesignCondition::setHeatingDryBulb99(const std::string& heatingDryBulb99) {
   bool ok;
   double value = stringToDouble(heatingDryBulb99, &ok);
-  setHeatingDryBulb99(value);
+  if (!ok) {
+    m_heatingDryBulb99 = boost::none;
+  } else {
+    setHeatingDryBulb99(value);
+  }
   return ok;
 }
 

src/utilities/filetypes/EpwFile.hpp

@@ -525,7 +525,7 @@ class UTILITIES_API EpwDesignCondition
   /** Returns the heating dry bulb temperature 99.6% in degrees C*/
   double heatingDryBulb99pt6() const;
   /** Returns the heating dry bulb temperature 99% in degrees C*/
-  double heatingDryBulb99() const;
+  boost::optional<double> heatingDryBulb99() const;
   /** Returns the heating humidification dew point temperature 99.6% in degrees C*/
   double heatingHumidificationDewPoint99pt6() const;
   /** Returns the heating humidification humidity ratio 99.6% in g of moisture per kg of dry air */
@@ -780,7 +780,7 @@ class UTILITIES_API EpwDesignCondition
   std::string m_titleOfDesignCondition;
   int m_heatingColdestMonth;
   double m_heatingDryBulb99pt6;
-  double m_heatingDryBulb99;
+  boost::optional<double> m_heatingDryBulb99;
   double m_heatingHumidificationDewPoint99pt6;
   double m_heatingHumidificationHumidityRatio99pt6;
   double m_heatingHumidificationMeanCoincidentDryBulb99pt6;

src/utilities/filetypes/test/EpwFile_GTest.cpp

@@ -174,7 +174,8 @@ TEST(Filetypes, EpwFile_Design) {
     EXPECT_EQ(-18.8, designs[0].getField(EpwDesignField("Heating Dry Bulb Temperature 99.6%")).get());
     EXPECT_EQ("C", designs[0].getUnitsByName("Heating Dry Bulb Temperature 99.6%").get());
     EXPECT_EQ("C", designs[0].getUnits(EpwDesignField("Heating Dry Bulb Temperature 99.6%")));
-    EXPECT_EQ(-15.5, designs[0].heatingDryBulb99());
+    ASSERT_TRUE(designs[0].heatingDryBulb99());
+    EXPECT_EQ(-15.5, designs[0].heatingDryBulb99().get());
     EXPECT_EQ(-21.6, designs[0].heatingHumidificationDewPoint99pt6());
     EXPECT_EQ(0.7, designs[0].heatingHumidificationHumidityRatio99pt6());
     EXPECT_EQ(-10.9, designs[0].heatingHumidificationMeanCoincidentDryBulb99pt6());
@@ -288,7 +289,8 @@ TEST(Filetypes, EpwFile_Design_DoubleRead) {
     EXPECT_EQ(-18.8, designs[0].getField(EpwDesignField("Heating Dry Bulb Temperature 99.6%")).get());
     EXPECT_EQ("C", designs[0].getUnitsByName("Heating Dry Bulb Temperature 99.6%").get());
     EXPECT_EQ("C", designs[0].getUnits(EpwDesignField("Heating Dry Bulb Temperature 99.6%")));
-    EXPECT_EQ(-15.5, designs[0].heatingDryBulb99());
+    ASSERT_TRUE(designs[0].heatingDryBulb99());
+    EXPECT_EQ(-15.5, designs[0].heatingDryBulb99().get());
     EXPECT_EQ(-21.6, designs[0].heatingHumidificationDewPoint99pt6());
     EXPECT_EQ(0.7, designs[0].heatingHumidificationHumidityRatio99pt6());
     EXPECT_EQ(-10.9, designs[0].heatingHumidificationMeanCoincidentDryBulb99pt6());
@@ -387,7 +389,8 @@ TEST(Filetypes, EpwFile_Data_DoubleRead) {
     EXPECT_EQ(-18.8, designs[0].getField(EpwDesignField("Heating Dry Bulb Temperature 99.6%")).get());
     EXPECT_EQ("C", designs[0].getUnitsByName("Heating Dry Bulb Temperature 99.6%").get());
     EXPECT_EQ("C", designs[0].getUnits(EpwDesignField("Heating Dry Bulb Temperature 99.6%")));
-    EXPECT_EQ(-15.5, designs[0].heatingDryBulb99());
+    ASSERT_TRUE(designs[0].heatingDryBulb99());
+    EXPECT_EQ(-15.5, designs[0].heatingDryBulb99().get());
     EXPECT_EQ(-21.6, designs[0].heatingHumidificationDewPoint99pt6());
     EXPECT_EQ(0.7, designs[0].heatingHumidificationHumidityRatio99pt6());
     EXPECT_EQ(-10.9, designs[0].heatingHumidificationMeanCoincidentDryBulb99pt6());
@@ -497,7 +500,7 @@ TEST(Filetypes, EpwFile_IncompleteDesign) {
     path p = resourcesPath() / toPath("utilities/Filetypes/USA_CO_Golden-NREL.724666_TMY3_IncompleteDesign.epw");
     EpwFile epwFile(p);
     EXPECT_EQ(p, epwFile.path());
-    EXPECT_EQ("BDF687C1", epwFile.checksum());
+    EXPECT_EQ("ECC55BA2", epwFile.checksum());
     EXPECT_EQ(openstudio::checksum(epwFile.path()), epwFile.checksum());
     EXPECT_EQ("Denver Centennial  Golden   Nr", epwFile.city());
     EXPECT_EQ("CO", epwFile.stateProvinceRegion());
@@ -515,14 +518,15 @@ TEST(Filetypes, EpwFile_IncompleteDesign) {
     // Up to here, everything should be the same as the first test. Now ask for the design conditions
     std::vector<EpwDesignCondition> designs = epwFile.designConditions();
     EXPECT_EQ(1, designs.size());
-    EXPECT_EQ("Climate Design Data 2009 ASHRAE Handbook", designs[0].titleOfDesignCondition());
+    EXPECT_EQ("Climate Design Data 2013 ASHRAE Handbook", designs[0].titleOfDesignCondition());
     EXPECT_EQ(12, designs[0].heatingColdestMonth());
     EXPECT_EQ(-18.8, designs[0].heatingDryBulb99pt6());
     EXPECT_EQ(-18.8, designs[0].getFieldByName("Heating Dry Bulb Temperature 99.6%").get());
     EXPECT_EQ(-18.8, designs[0].getField(EpwDesignField("Heating Dry Bulb Temperature 99.6%")).get());
     EXPECT_EQ("C", designs[0].getUnitsByName("Heating Dry Bulb Temperature 99.6%").get());
     EXPECT_EQ("C", designs[0].getUnits(EpwDesignField("Heating Dry Bulb Temperature 99.6%")));
-    EXPECT_EQ(-15.5, designs[0].heatingDryBulb99());
+    ASSERT_FALSE(designs[0].heatingDryBulb99());
+    //EXPECT_EQ(-15.5, designs[0].heatingDryBulb99().get());
     EXPECT_EQ(-21.6, designs[0].heatingHumidificationDewPoint99pt6());
     EXPECT_EQ(0.7, designs[0].heatingHumidificationHumidityRatio99pt6());
     EXPECT_EQ(-10.9, designs[0].heatingHumidificationMeanCoincidentDryBulb99pt6());