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

exprtk.hpp

diff --git a/exprtk.hpp b/exprtk.hpp
index 5726160..a9aba4a 100644
--- a/exprtk.hpp
+++ b/exprtk.hpp
@@ -13568,7 +13568,7 @@
             init_branches<1>(branch_, brnch);
          }
 
-         ~bipow_node()
+        ~bipow_node()
          {
             cleanup_branches::execute<T,1>(branch_);
          }
@@ -13635,7 +13635,7 @@
             init_branches<1>(branch_, brnch);
          }
 
-         ~bipowninv_node()
+        ~bipowninv_node()
          {
             cleanup_branches::execute<T,1>(branch_);
          }