Added Alignment, Defaultable and Scriptable types, needed some reflection tweaks for the last two.

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@17 0fc631ac-6414-0410-93d0-97cfa31319b6

src/util/defaultable.hpp

@@ -0,0 +1,68 @@
+//+----------------------------------------------------------------------------+
+//| Description:  Magic Set Editor - Program to make Magic (tm) cards          |
+//| Copyright:    (C) 2001 - 2006 Twan van Laarhoven                           |
+//| License:      GNU General Public License 2 or later (see file COPYING)     |
+//+----------------------------------------------------------------------------+
+
+#ifndef HEADER_UTIL_DEFAULTABLE
+#define HEADER_UTIL_DEFAULTABLE
+
+// ----------------------------------------------------------------------------- : Includes
+
+#include <util/prec.hpp>
+#include <util/reflect.hpp>
+
+// ----------------------------------------------------------------------------- : Defaultable
+
+/// A value that can also be in a 'default' state.
+/** TODO: Defaultable is automatically also Aged
+ */
+template <typename T>
+class Defaultable {
+  public:
+	inline Defaultable()           :           is_default(true)  {}
+	inline Defaultable(const T& v) : value(v), is_default(false) {}
+	
+	/// Assigning a value takes this object out of the default state
+	inline void assign(const T& new_value) {
+		value      = new_value;
+		is_default = false;
+	}
+	
+	/// Get access to the value
+	inline const T& operator () () const { return value; }
+	
+	/// Is this value in the default state?
+	inline bool isDefault() const { return is_default; }
+	
+  private:
+	/// Is this value in the default state?
+	bool is_default;
+	/// The value
+	T value;
+	
+	friend class Reader;
+	friend class Writer;
+};
+
+
+// we need some custom io, because the behaviour is different for each of Reader/Writer/GetMember
+
+template <typename T>
+void Reader::handle(Defaultable<T>& def) {
+	def.is_default = false;
+	handle(def.value);
+}
+template <typename T>
+void Writer::handle(const Defaultable<T>& def) {
+	if (!def.isDefault()) {
+		handle(def());
+	}
+}
+template <typename T>
+void GetMember::handle(const Defaultable<T>& def) {
+	store(def());
+}
+
+// ----------------------------------------------------------------------------- : EOF
+#endif