Attempt to fix compilation errors on clang 8.0

Author: kpeeters

core/YoungTab.hh

@@ -137,7 +137,12 @@ namespace yngtab {
 				typedef std::random_access_iterator_tag iterator_category;
 			};
 
-
+			class const_iterator;
+			class in_column_iterator;
+			class in_column_const_iterator;
+			class in_row_iterator;
+			class in_row_const_iterator;						
+			
 			/// An iterator which stays inside a given column of a tableau.
 			class in_column_iterator : public iterator_base {
 				public:
@@ -167,6 +172,7 @@ namespace yngtab {
 					unsigned int       column_number, row_number;
 				};
 
+			/// A const iterator which stays inside a given column of a tableau.
 			class in_column_const_iterator : public const_iterator_base {
 			public:
 				in_column_const_iterator(unsigned int r, unsigned int c, const filled_tableau<T>*);
@@ -195,7 +201,6 @@ namespace yngtab {
 				unsigned int       column_number, row_number;
 			};
 
-
 			/// An iterator which stays inside a given row of a tableau.
 			class in_row_iterator : public iterator_base {
 			public:

core/pythoncdb/py_properties.cc

@@ -154,7 +154,7 @@ namespace cadabra {
 	{
 		auto new_prop = new cpp_type();
 		get_kernel_from_scope()->inject_property(new_prop, ex, param);
-		prop = new_prop;
+		BoundPropertyBase::prop = new_prop;
 	}
 
 
@@ -180,7 +180,7 @@ namespace cadabra {
 	template <typename PropT, typename... ParentTs>
 	const PropT* BoundProperty<PropT, ParentTs...>::get_prop() const
 	{
-		return dynamic_cast<const PropT*>(prop);
+	return dynamic_cast<const PropT*>(BoundPropertyBase::prop);
 	}