bindings for eval functions

src/bindings.cpp

@@ -1,6 +1,7 @@
 #include <pybind11/pybind11.h>
 #include <pybind11/stl.h>
 #include <pybind11/complex.h>
+#include <pybind11/functional.h>
 #include <pybind11/operators.h>
 #include <pybind11/iostream.h>
 #include <iostream>