pushing buggy code is a thing I do deal with it this is devel not stable

Makefile

@@ -1,6 +1,6 @@
 CXX= clang++-8
 CXXFLAGS= --std=c++17 -O0 -pthread -DGP_TESTS -DFUZZ_STRENGTH=500 -pedantic -Werror \
- -Wno-unknown-attributes \
+ -Wno-unknown-attributes -frtti \
  -g -fprofile-instr-generate -fcoverage-mapping
 # -fsanitize=address -fno-omit-frame-pointer
 all: tests

include/gp/function.hpp

@@ -30,6 +30,7 @@ namespace gp{
 			}
 		};
 
+		// tweak a way to store a size in there for trivial copy
 		enum state_t : uint8_t{
 			INACTIVE = 0,
 			ACTIVE = 1,
@@ -51,7 +52,7 @@ namespace gp{
 			{
 				if(state & SOO)
 				{
-					((virtual_callable*)o">&self)->~virtual_callable();
+					((virtual_callable*)n">self.inplace)->~virtual_callable();
 				}
 				else
 				{
@@ -60,12 +61,12 @@ namespace gp{
 			}
 			if constexpr (sizeof(callable<T>) <= sizeof(self))
 			{
-				new((void*)o">&self) callable(t);
+				new((void*)n">self.inplace) callable(t);
 				state = (state_t)(ACTIVE | SOO);
 			}
 			else
 			{
-				self = new callable(t);
+				self.functor = new callable<T>(t);
 				state = (state_t)(ACTIVE | NO_SOO);
 			}
 		}
@@ -80,12 +81,12 @@ namespace gp{
 		{
 			if constexpr (sizeof(callable<T>) <= sizeof(self))
 			{
-				new((void*)o">&self) callable<T>(t);
+				new((void*)n">self.inplace) callable<T>(t);
 				state = (state_t)(ACTIVE | SOO);
 			}
 			else
 			{
-				self = new callable<T>(t);
+				self.functor = new callable<T>(t);
 				state = (state_t)(ACTIVE | NO_SOO);
 			}
 		}
@@ -119,7 +120,7 @@ namespace gp{
 			}
 			else
 			{
-				return (*p">(self.functor))(arg_list...);
+				return (*self.functor)(arg_list...);
 			}
 			
 		}

tests/math.cpp

@@ -78,24 +78,24 @@ struct render_test : public test_scaffold {
 			}
 		);
 
+		auto l_sdf = gp::difference_sdf<float>(
+			gp::sphere_sdf<float>({0.0,0.0,0.0}, 1.0),
+			gp::sphere_sdf<float>({-0.75,0.0,0.0}, 1.0)
+		);
 		auto sphere = a.scene_elements.push(
-			[=](vec3 pos) -> render_point {
+			[&](vec3 pos) -> render_point {
 				render_point ret;
-				const auto l_sdf = gp::difference_sdf<float>(
-					gp::sphere_sdf<float>({0.0,0.0,0.0}, 1.0),
-					gp::sphere_sdf<float>({-0.75,0.0,0.0}, 1.0)
-				);
 				ret.distance = l_sdf(pos);
 				ret.material = red;
 				return ret;
 			}
 		);
 
+		auto l_sdf_b = gp::sphere_sdf<float>({-0.75,0.0,0.0}, 1.0);
 		auto sphere2 = a.scene_elements.push(
-			[=](vec3 pos) -> render_point {
+			[&](vec3 pos) -> render_point {
 				render_point ret;
-				const auto l_sdf = gp::sphere_sdf<float>({-0.75,0.0,0.0}, 1.0);
-				ret.distance = l_sdf(pos);
+				ret.distance = l_sdf_b(pos);
 				ret.material = green;
 				return ret;
 			}