Fixed HDFFV-10472

Description:
    Added operator!= to DataType
        bool operator!=(const DataType& compared_type)
Platforms tested:
    Linux/64 (jelly)
    Linux/32 (jam)
    Darwin (osx1010test)

c++/src/H5DataType.cpp

@@ -395,6 +395,20 @@ bool DataType::operator==(const DataType& compared_type) const
     }
 }
 
+//--------------------------------------------------------------------------
+// Function:    DataType::operator!=
+///\brief       Compares this DataType against the given one to determines
+///             whether the two objects refer to different actual datatypes.
+///\param       compared_type - IN: Reference to the datatype to compare
+///\return      true if the datatypes are not equal, and false, otherwise.
+///\exception   H5::DataTypeIException
+// July, 2018
+//--------------------------------------------------------------------------
+bool DataType::operator!=(const DataType& compared_type) const
+{
+    return !operator==(compared_type);
+}
+
 //--------------------------------------------------------------------------
 // Function:    DataType::p_commit (private)
 //\brief        Commits a transient datatype to a file, creating a new

c++/src/H5DataType.h

@@ -90,6 +90,9 @@ class H5_DLLCPP DataType : public H5Object {
         // Determines whether two datatypes are the same.
         bool operator==(const DataType& compared_type) const;
 
+        // Determines whether two datatypes are not the same.
+        bool operator!=(const DataType& compared_type) const;
+
         // Locks a datatype.
         void lock() const;
 

c++/test/ttypes.cpp

@@ -1024,6 +1024,86 @@ static void test_encode_decode()
     }
 }
 
+
+/*-------------------------------------------------------------------------
+ * Function:    test_operators
+ *
+ * Purpose      Test datatype encode/decode functionality.
+ *
+ * Return       None
+ *
+ * Programmer   Binh-Minh Ribler (using C version)
+ *              August, 2017
+ *-------------------------------------------------------------------------
+ */
+const H5std_string filename4("h5_type_operators.h5");
+
+static void test_operators()
+{
+    short        enum_val;
+
+    SUBTEST("DataType::operator== and DataType::operator!=");
+    try {
+        // Create the file.
+        H5File file(filename4, H5F_ACC_TRUNC);
+
+        //
+        // Test with CompType
+        //
+
+        // Create a compound datatype
+        CompType cmptyp(sizeof(src_typ_t));
+
+        cmptyp.insertMember("a", HOFFSET(src_typ_t, a), PredType::NATIVE_INT);
+        cmptyp.insertMember("b", HOFFSET(src_typ_t, b), PredType::NATIVE_FLOAT);
+        cmptyp.insertMember("c", HOFFSET(src_typ_t, c), PredType::NATIVE_LONG);
+        cmptyp.insertMember("d", HOFFSET(src_typ_t, d), PredType::NATIVE_DOUBLE);
+
+        // Copy this compound datatype
+        CompType clone_cmptyp(cmptyp);
+
+        // Verify that operator== and operator!= work properly
+        verify_val(cmptyp == clone_cmptyp, true, "DataType::operator==", __LINE__, __FILE__);
+        verify_val(cmptyp != clone_cmptyp, false, "DataType::operator!=", __LINE__, __FILE__);
+
+        //
+        // Test with EnumType
+        //
+
+        // Create a enumerate datatype
+        EnumType enumtyp(sizeof(short));
+
+        enumtyp.insert("RED", (enum_val=0,&enum_val));
+        enumtyp.insert("GREEN", (enum_val=1,&enum_val));
+        enumtyp.insert("BLUE", (enum_val=2,&enum_val));
+
+        // Verify that operator== and operator!= work properly
+        verify_val(cmptyp == enumtyp, false, "DataType::operator==", __LINE__, __FILE__);
+        verify_val(cmptyp != enumtyp, true, "DataType::operator!=", __LINE__, __FILE__);
+
+        //
+        // Test with compound datatype's member
+        //
+
+        // Create a variable-length string type
+        IntType inttyp(PredType::NATIVE_INT);
+        FloatType flttyp(PredType::NATIVE_FLOAT);
+
+        // Get NATIVE_INT member from the compound datatype above
+        IntType member_inttyp = cmptyp.getMemberIntType(0);
+
+        verify_val(inttyp == member_inttyp, true, "DataType::operator==", __LINE__, __FILE__);
+        verify_val(flttyp == member_inttyp, false, "DataType::operator==", __LINE__, __FILE__);
+        verify_val(flttyp != member_inttyp, true, "DataType::operator==", __LINE__, __FILE__);
+
+        PASSED();
+    }
+    catch (Exception& E)
+    {
+        issue_fail_msg("test_operators", __LINE__, __FILE__, E.getCDetailMsg());
+    }
+}   // test_operators
+
 
 /*-------------------------------------------------------------------------
  * Function:    test_types
@@ -1048,6 +1128,7 @@ void test_types()
     test_transient();
     test_named();
     test_encode_decode();
+    test_operators();
 
 }   // test_types()