Added Evaluation Context and Math Rules

2014-09-15 15:58:35 +02:00
parent 6573cd1b5c
commit 3cf2006af7
6 changed files with 191 additions and 41 deletions
--- a/MathPad/MPEvaluationContext.m
+++ b/MathPad/MPEvaluationContext.m
@@ -25,6 +25,9 @@ static MPEvaluationContext *sharedContext;

 - (instancetype)init
 {
+    if (sharedContext) {
+        return sharedContext;
+    }
    self = [super init];
    if (self) {
        _stack = [[NSMutableArray alloc] init];