# HG changeset patch
# User David Demelier <markand@malikania.fr>
# Date 1445580963 -7200
# Node ID 738751252248d61ff7ff47cae88c1b9ce85022ce
# Parent  aaf975293996d297e2af1cd86a1b4a89dc9efc65
Js: add optionalProperty

diff -r aaf975293996 -r 738751252248 C++/modules/Js/Js.h
--- a/C++/modules/Js/Js.h	Fri Oct 23 08:15:48 2015 +0200
+++ b/C++/modules/Js/Js.h	Fri Oct 23 08:16:03 2015 +0200
@@ -818,6 +818,44 @@
 	}
 
 	/**
+	 * Get an optional property `name` from the object at the specified index.
+	 *
+	 * @param index the object index
+	 * @param name the property name
+	 * @param def the default value
+	 * @return the value or def
+	 * @note The stack is unchanged
+	 */
+	template <typename Type, typename DefaultValue>
+	inline auto optionalProperty(int index, const std::string &name, DefaultValue &&def) -> decltype(optional<Type>(0, std::forward<DefaultValue>(def)))
+	{
+		duk_get_prop_string(m_handle.get(), index, name.c_str());
+		decltype(optional<Type>(0, std::forward<DefaultValue>(def))) value = optional<Type>(-1, std::forward<DefaultValue>(def));
+		duk_pop(m_handle.get());
+
+		return value;
+	}
+
+	/**
+	 * Get an optional property by index, for arrays
+	 *
+	 * @param index the object index
+	 * @param position the position int the object
+	 * @param def the default value
+	 * @return the value or def
+	 * @note The stack is unchanged
+	 */
+	template <typename Type, typename DefaultValue>
+	inline auto optionalProperty(int index, int position, DefaultValue &&def) -> decltype(optional<Type>(0, std::forward<DefaultValue>(def)))
+	{
+		duk_get_prop_index(m_handle.get(), index, position);
+		decltype(optional<Type>(0, std::forward<DefaultValue>(def))) value = optional<Type>(-1, std::forward<DefaultValue>(def));
+		duk_pop(m_handle.get());
+
+		return value;
+	}
+
+	/**
 	 * Set a property to the object at the specified index.
 	 *
 	 * @param index the object index