multi type test, it's possible for infinite recursion.

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.25)
-project(blt-gp VERSION 0.0.36)
+project(blt-gp VERSION 0.0.37)
 
 include(CTest)
 

examples/gp_test_2.cpp

@@ -26,10 +26,19 @@ static constexpr long SEED = 41912;
 blt::gp::type_system type_system;
 blt::gp::gp_program program(type_system, std::mt19937_64{SEED}); // NOLINT
 
-blt::gp::operation_t add([](float a, float b) { return a + b; });
+blt::gp::operation_t add([](float a, float b) {
-blt::gp::operation_t sub([](float a, float b) { return a - b; });
+    BLT_TRACE("a: %f + b: %f = %f", a, b, a + b);
-blt::gp::operation_t mul([](float a, float b) { return a * b; });
+    return a + b;
-blt::gp::operation_t pro_div([](float a, float b) { return b == 0 ? 0.0f : a / b; });
+});
+blt::gp::operation_t sub([](float a, float b) {
+    BLT_TRACE("a: %f - b: %f = %f", a, b, a - b);
+    return a - b; });
+blt::gp::operation_t mul([](float a, float b) {
+    BLT_TRACE("a: %f * b: %f = %f", a, b, a * b);
+    return a * b; });
+blt::gp::operation_t pro_div([](float a, float b) {
+    BLT_TRACE("a: %f / b: %f = %f", a, b, (b == 0 ? 0.0f : a / b));
+    return b == 0 ? 0.0f : a / b; });
 blt::gp::operation_t lit([]() {
     //static std::uniform_real_distribution<float> dist(-32000, 32000);
     static std::uniform_real_distribution<float> dist(0.0f, 10.0f);

examples/gp_test_3.cpp

@@ -59,6 +59,17 @@ int main()
     silly.add_operator(sub);
     silly.add_operator(mul);
     silly.add_operator(pro_div);
+    
+    silly.add_operator(op_if);
+    silly.add_operator(eq_f);
+    silly.add_operator(eq_b);
+    silly.add_operator(lt);
+    silly.add_operator(gt);
+    silly.add_operator(op_and);
+    silly.add_operator(op_or);
+    silly.add_operator(op_xor);
+    silly.add_operator(op_not);
+    
     silly.add_operator(lit, true);
     
     program.set_operations(std::move(silly));

src/generators.cpp

@@ -89,6 +89,9 @@ namespace blt::gp
         return create_tree([args](gp_program& program, std::stack<stack>& tree_generator, const type& type, blt::size_t new_depth) {
             if (new_depth >= args.max_depth)
             {
+                if (program.get_type_terminals(type.id()).empty())
+                    tree_generator.push({program.select_non_terminal(type.id()), new_depth});
+                else
                     tree_generator.push({program.select_terminal(type.id()), new_depth});
                 return;
             }
@@ -104,6 +107,9 @@ namespace blt::gp
         return create_tree([args](gp_program& program, std::stack<stack>& tree_generator, const type& type, blt::size_t new_depth) {
             if (new_depth >= args.max_depth)
             {
+                if (program.get_type_terminals(type.id()).empty())
+                    tree_generator.push({program.select_non_terminal(type.id()), new_depth});
+                else
                     tree_generator.push({program.select_terminal(type.id()), new_depth});
                 return;
             }