Various bugfixes and additions

eo/contrib/mathsym/eval/MultiFuncs.cpp

@@ -0,0 +1,26 @@
+
+namespace multi_function {
+    
+double plus(arg_ptr args) {
+    return *args[0] + *args[1];
+}
+
+double mult(arg_ptr args) {
+    return *args[0] * *args[1];
+}
+
+double min(arg_ptr args) {
+    return -**args;
+}
+
+double inv(arg_ptr args) {
+    return 1 / **args;
+}   
+
+//template <typename f> class F { public: double operator()(double a) { return f(a); } };
+
+double exp(arg_ptr args) {
+    return ::exp(**args);
+}
+
+} // namespace