C++ Mathematical Expression Library (ExprTk)  http://www.partow.net/programming/exprtk/index.html

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index d88c773..5ce5a53 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,3 +9,4 @@
 
 script:
   - make clean all
+  - ./exprtk_test