Reorganized File Structure

Added Documentation

MathKit/MPParenthesisFunction.h

@@ -0,0 +1,35 @@
+//
+//  MPParenthesisFunction.h
+//  MathPad
+//
+//  Created by Kim Wittenburg on 17.09.14.
+//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
+//
+
+#import "MPFunction.h"
+
+
+
+@class MPParenthesisFunction, MPExpression;
+
+
+/*!
+    @class      MPParenthesisFunction
+    @brief      A parenthesis function encapsulates a single expression and thus
+                prioritizes it in evaluation.
+ 
+    @discussion Prioritizing the expression means that the complete expression
+                must be evaluated 'as is'. No part of it can be 'used' elsewhere
+                before the parenthesis function has been evaluated.
+ */
+@interface MPParenthesisFunction : MPFunction
+
+/*!
+    @property   expression
+    @brief      The expression encapsulated by the parenthesis.
+ 
+    @discussion The expression must not define a variable.
+ */
+@property (nonatomic, strong) MPExpression *expression;
+
+@end