diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2b8b85e..019bcd6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.25)
-project(blt-gp VERSION 0.1.14)
+project(blt-gp VERSION 0.1.15)
 
 include(CTest)
 
diff --git a/examples/symbolic_regression.cpp b/examples/symbolic_regression.cpp
index 3227c6a..53024da 100644
--- a/examples/symbolic_regression.cpp
+++ b/examples/symbolic_regression.cpp
@@ -102,18 +102,6 @@ int main()
     type_system.register_type<float>();
     
     blt::gp::operator_builder<context> builder{type_system};
-//    builder.add_operator(add);
-//    builder.add_operator(sub);
-//    builder.add_operator(mul);
-//    builder.add_operator(pro_div);
-//    builder.add_operator(op_sin);
-//    builder.add_operator(op_cos);
-//    builder.add_operator(op_exp);
-//    builder.add_operator(op_log);
-//
-//    builder.add_operator(lit, true);
-//    builder.add_operator(op_x);
-    
     program.set_operations(builder.build(add, sub, mul, pro_div, op_sin, op_cos, op_exp, op_log, lit, op_x));
     
     BLT_DEBUG("Generate Initial Population");
diff --git a/include/blt/gp/fwdecl.h b/include/blt/gp/fwdecl.h
index 97b1761..bc45258 100644
--- a/include/blt/gp/fwdecl.h
+++ b/include/blt/gp/fwdecl.h
@@ -57,7 +57,7 @@ namespace blt::gp
         
         class operator_storage_test;
         // context*, read stack, write stack
-        //using callable_t = std::function<void(void*, stack_allocator&, stack_allocator&, bitmask_t*)>;
+        using operator_func_t = std::function<void(void*, stack_allocator&, stack_allocator&)>;
         using eval_func_t = std::function<evaluation_context(const tree_t& tree, void* context)>;
         // debug function,
         using print_func_t = std::function<void(std::ostream&, stack_allocator&)>;
diff --git a/include/blt/gp/operations.h b/include/blt/gp/operations.h
index 0678634..57f8ffd 100644
--- a/include/blt/gp/operations.h
+++ b/include/blt/gp/operations.h
@@ -187,21 +187,21 @@ namespace blt::gp
                 }
             }
             
-//            template<typename Context>
-//            [[nodiscard]] detail::callable_t make_callable() const
-//            {
-//                return [this](void* context, stack_allocator& read_allocator, stack_allocator& write_allocator, detail::bitmask_t* mask) {
-//                    if constexpr (detail::is_same_v<Context, detail::remove_cv_ref<typename detail::first_arg<Args...>::type>>)
-//                    {
-//                        // first arg is context
-//                        write_allocator.push(this->operator()(context, read_allocator, mask));
-//                    } else
-//                    {
-//                        // first arg isn't context
-//                        write_allocator.push(this->operator()(read_allocator, mask));
-//                    }
-//                };
-//            }
+            template<typename Context>
+            [[nodiscard]] detail::operator_func_t make_callable() const
+            {
+                return [this](void* context, stack_allocator& read_allocator, stack_allocator& write_allocator) {
+                    if constexpr (detail::is_same_v<Context, detail::remove_cv_ref<typename detail::first_arg<Args...>::type>>)
+                    {
+                        // first arg is context
+                        write_allocator.push(this->operator()(context, read_allocator, nullptr));
+                    } else
+                    {
+                        // first arg isn't context
+                        write_allocator.push(this->operator()(read_allocator, nullptr));
+                    }
+                };
+            }
             
             [[nodiscard]] inline constexpr std::optional<std::string_view> get_name() const
             {
diff --git a/include/blt/gp/program.h b/include/blt/gp/program.h
index fdee5cd..51fbefb 100644
--- a/include/blt/gp/program.h
+++ b/include/blt/gp/program.h
@@ -75,6 +75,8 @@ namespace blt::gp
         type_id return_type;
         // number of arguments for this operator
         argc_t argc;
+        // per operator function callable (slow)
+        detail::operator_func_t func;
     };
     
     struct operator_storage
@@ -225,6 +227,7 @@ namespace blt::gp
                 
                 info.argc.argc_context = info.argc.argc = sizeof...(Args);
                 info.return_type = return_type_id;
+                info.func = op.template make_callable<Context>();
                 
                 ((std::is_same_v<detail::remove_cv_ref<Args>, Context> ? info.argc.argc -= 1 : (blt::size_t) nullptr), ...);
                 
diff --git a/src/generators.cpp b/src/generators.cpp
index 301a22b..9c5b4eb 100644
--- a/src/generators.cpp
+++ b/src/generators.cpp
@@ -70,7 +70,7 @@ namespace blt::gp
             
             if (args.program.is_static(top.id))
             {
-                //info.function(nullptr, tree.get_values(), tree.get_values(), nullptr);
+                info.func(nullptr, tree.get_values(), tree.get_values());
                 continue;
             }