+ Added cache, which speeds up the repetitive calculations

+ Returned variables, because they need for cached expressions

1 files changed, 19 insertions, 0 deletions

diff --git a/src/NXP/Exception/UnknownVariableException.php b/src/NXP/Exception/UnknownVariableException.php
new file mode 100644
index 0000000..8de9493
--- /dev/null
+++ b/src/NXP/Exception/UnknownVariableException.php
@@ -0,0 +1,19 @@
+<?php
+
+/**
+ * This file is part of the MathExecutor package
+ *
+ * (c) Alexander Kiryukhin
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code
+ */
+
+namespace NXP\Exception;
+
+/**
+ * @author Alexander Kiryukhin <alexander@symdev.org>
+ */
+class UnknownVariableException extends \Exception
+{
+}