Proper detection of non-default constructible types

Prior to CastXML/CastXML#55 being fixed, CastXML would incorrectly
generate default constructor definitions for types with const data
members. This caused pygccxml to incorrectly flag such types as
trivially constructible.

These tests have now been fixed, and the tests are being executed
conditionally only for GCCXML (which handles them correctly), or, if
CastXML is being used, then for xml_output_version >= 1.138.

Change-Id: If1e164eeb467a569689696cf34c2c668317e6fb1

Author: praetorian20

unittests/data/type_traits.hpp

@@ -589,10 +589,6 @@ namespace yes{
     struct x{
         x(){}
     };
-#ifdef __castxml__
-    typedef details::const_item const_item;
-    typedef details::const_container const_container;
-#endif
 }
 
 namespace no{
@@ -613,6 +609,9 @@ namespace no{
     public:
         static singleton_t* instance();
     };
+
+    typedef details::const_item const_item;
+    typedef details::const_container const_container;
 } }
 
 namespace has_public_constructor{

unittests/type_traits_tester.py

@@ -60,6 +60,13 @@ def __test_type_category(self, ns_name, controller):
                     decl.name.startswith('test_'):
                 continue
 
+            if ("CastXML" in utils.xml_generator and
+                    utils.xml_output_version < 1.138 and
+                    decl.name in ['const_item', 'const_container']):
+                # Skip this test to workaround CastXML bug.
+                # See https://github.com/CastXML/CastXML/issues/55
+                continue
+
             self.assertFalse(
                 controller(decl),
                 er % (decl.decl_string, ns_name))
@@ -360,12 +367,13 @@ def test(self):
         code = "struct const_item{ const int values[10]; };"
         global_ns = parser.parse_string(code, config)[0]
         ci = global_ns.class_('const_item')
-        if 'CastXML' in utils.xml_generator:
-            # Constructor, copy constructor, destructor, variable
-            self.assertTrue(len(ci.declarations) == 4)
-        else:
+        if ("CastXML" not in utils.xml_generator or
+                utils.xml_output_version >= 1.138):
+            # Prior to version 1.138, CastXML would incorrect create a default
+            # constructor definition.
+            # See https://github.com/CastXML/CastXML/issues/55
             # Copy constructor, destructor, variable
-            self.assertTrue(len(ci.declarations) == 3)
+            self.assertEqual(len(ci.declarations), 3)
 
 # class tester_diff_t( parser_test_case.parser_test_case_t ):
     # COMPILATION_MODE = parser.COMPILATION_MODE.ALL_AT_ONCE