Convert `PtrToArg` macros to regular C++ structs.

core/variant/method_ptrcall.h

@@ -35,113 +35,215 @@
 #include "core/typedefs.h"
 #include "core/variant/variant.h"
 
-template <typename T, typename = void>
-struct PtrToArg;
+namespace Internal {
 
 template <typename T>
-struct PtrToArg<T, std::enable_if_t<!std::is_same_v<T, GetSimpleTypeT<T>>>> : PtrToArg<GetSimpleTypeT<T>> {};
+struct PtrToArgDirect {
+	_FORCE_INLINE_ static const T &convert(const void *p_ptr) {
+		return *reinterpret_cast<const T *>(p_ptr);
+	}
+	typedef T EncodeT;
+	_FORCE_INLINE_ static void encode(T p_val, void *p_ptr) {
+		*((T *)p_ptr) = p_val;
+	}
+};
 
-#define MAKE_PTRARG(m_type)                                              \
-	template <>                                                          \
-	struct PtrToArg<m_type> {                                            \
-		_FORCE_INLINE_ static const m_type &convert(const void *p_ptr) { \
-			return *reinterpret_cast<const m_type *>(p_ptr);             \
-		}                                                                \
-		typedef m_type EncodeT;                                          \
-		_FORCE_INLINE_ static void encode(m_type p_val, void *p_ptr) {   \
-			*((m_type *)p_ptr) = p_val;                                  \
-		}                                                                \
-	};
+template <typename T, typename S>
+struct PtrToArgConvert {
+	_FORCE_INLINE_ static T convert(const void *p_ptr) {
+		return static_cast<T>(*reinterpret_cast<const S *>(p_ptr));
+	}
+	typedef S EncodeT;
+	_FORCE_INLINE_ static void encode(T p_val, void *p_ptr) {
+		*((S *)p_ptr) = static_cast<S>(p_val);
+	}
+};
 
-#define MAKE_PTRARGCONV(m_type, m_conv)                                           \
-	template <>                                                                   \
-	struct PtrToArg<m_type> {                                                     \
-		_FORCE_INLINE_ static m_type convert(const void *p_ptr) {                 \
-			return static_cast<m_type>(*reinterpret_cast<const m_conv *>(p_ptr)); \
-		}                                                                         \
-		typedef m_conv EncodeT;                                                   \
-		_FORCE_INLINE_ static void encode(m_type p_val, void *p_ptr) {            \
-			*((m_conv *)p_ptr) = static_cast<m_conv>(p_val);                      \
-		}                                                                         \
-	};
+template <typename T>
+struct PtrToArgByReference {
+	_FORCE_INLINE_ static const T &convert(const void *p_ptr) {
+		return *reinterpret_cast<const T *>(p_ptr);
+	}
+	typedef T EncodeT;
+	_FORCE_INLINE_ static void encode(const T &p_val, void *p_ptr) {
+		*((T *)p_ptr) = p_val;
+	}
+};
 
-#define MAKE_PTRARG_BY_REFERENCE(m_type)                                      \
-	template <>                                                               \
-	struct PtrToArg<m_type> {                                                 \
-		_FORCE_INLINE_ static const m_type &convert(const void *p_ptr) {      \
-			return *reinterpret_cast<const m_type *>(p_ptr);                  \
-		}                                                                     \
-		typedef m_type EncodeT;                                               \
-		_FORCE_INLINE_ static void encode(const m_type &p_val, void *p_ptr) { \
-			*((m_type *)p_ptr) = p_val;                                       \
-		}                                                                     \
-	};
+template <typename T, typename TAlt>
+struct PtrToArgVectorConvert {
+	_FORCE_INLINE_ static Vector<TAlt> convert(const void *p_ptr) {
+		const Vector<T> *dvs = reinterpret_cast<const Vector<T> *>(p_ptr);
+		Vector<TAlt> ret;
+		int len = dvs->size();
+		ret.resize(len);
+		{
+			const T *r = dvs->ptr();
+			for (int i = 0; i < len; i++) {
+				ret.write[i] = r[i];
+			}
+		}
+		return ret;
+	}
+	// No EncodeT because direct pointer conversion not possible.
+	_FORCE_INLINE_ static void encode(const Vector<TAlt> &p_vec, void *p_ptr) {
+		Vector<T> *dv = reinterpret_cast<Vector<T> *>(p_ptr);
+		int len = p_vec.size();
+		dv->resize(len);
+		{
+			T *w = dv->ptrw();
+			for (int i = 0; i < len; i++) {
+				w[i] = p_vec[i];
+			}
+		}
+	}
+};
 
-#define MAKE_PTRARGCONV_CONDITIONAL(m_type, m_conv, m_conditional)                \
-	template <typename T>                                                         \
-	struct PtrToArg<m_type, std::enable_if_t<m_conditional>> {                    \
-		_FORCE_INLINE_ static m_type convert(const void *p_ptr) {                 \
-			return static_cast<m_type>(*reinterpret_cast<const m_conv *>(p_ptr)); \
-		}                                                                         \
-		typedef m_conv EncodeT;                                                   \
-		_FORCE_INLINE_ static void encode(m_type p_val, void *p_ptr) {            \
-			*((m_conv *)p_ptr) = static_cast<m_conv>(p_val);                      \
-		}                                                                         \
-	};
+template <typename T>
+struct PtrToArgVectorFromArray {
+	_FORCE_INLINE_ static Vector<T> convert(const void *p_ptr) {
+		const Array *arr = reinterpret_cast<const Array *>(p_ptr);
+		Vector<T> ret;
+		int len = arr->size();
+		ret.resize(len);
+		for (int i = 0; i < len; i++) {
+			ret.write[i] = (*arr)[i];
+		}
+		return ret;
+	}
+	// No EncodeT because direct pointer conversion not possible.
+	_FORCE_INLINE_ static void encode(const Vector<T> &p_vec, void *p_ptr) {
+		Array *arr = reinterpret_cast<Array *>(p_ptr);
+		int len = p_vec.size();
+		arr->resize(len);
+		for (int i = 0; i < len; i++) {
+			(*arr)[i] = p_vec[i];
+		}
+	}
+};
+
+template <typename T>
+struct PtrToArgStringConvertByReference {
+	_FORCE_INLINE_ static T convert(const void *p_ptr) {
+		T s = *reinterpret_cast<const String *>(p_ptr);
+		return s;
+	}
+	// No EncodeT because direct pointer conversion not possible.
+	_FORCE_INLINE_ static void encode(const T &p_vec, void *p_ptr) {
+		String *arr = reinterpret_cast<String *>(p_ptr);
+		*arr = p_vec;
+	}
+};
+
+} //namespace Internal
 
-MAKE_PTRARGCONV(bool, uint8_t);
+template <typename T, typename = void>
+struct PtrToArg;
+
+template <typename T>
+struct PtrToArg<T, std::enable_if_t<!std::is_same_v<T, GetSimpleTypeT<T>>>> : PtrToArg<GetSimpleTypeT<T>> {};
+
+template <>
+struct PtrToArg<bool> : Internal::PtrToArgConvert<bool, uint8_t> {};
 // Integer types.
-MAKE_PTRARGCONV(uint8_t, int64_t);
-MAKE_PTRARGCONV(int8_t, int64_t);
-MAKE_PTRARGCONV(uint16_t, int64_t);
-MAKE_PTRARGCONV(int16_t, int64_t);
-MAKE_PTRARGCONV(uint32_t, int64_t);
-MAKE_PTRARGCONV(int32_t, int64_t);
-MAKE_PTRARG(int64_t);
-MAKE_PTRARG(uint64_t);
+template <>
+struct PtrToArg<uint8_t> : Internal::PtrToArgConvert<uint8_t, int64_t> {};
+template <>
+struct PtrToArg<int8_t> : Internal::PtrToArgConvert<int8_t, int64_t> {};
+template <>
+struct PtrToArg<uint16_t> : Internal::PtrToArgConvert<uint16_t, int64_t> {};
+template <>
+struct PtrToArg<int16_t> : Internal::PtrToArgConvert<int16_t, int64_t> {};
+template <>
+struct PtrToArg<uint32_t> : Internal::PtrToArgConvert<uint32_t, int64_t> {};
+template <>
+struct PtrToArg<int32_t> : Internal::PtrToArgConvert<int32_t, int64_t> {};
+template <>
+struct PtrToArg<int64_t> : Internal::PtrToArgDirect<int64_t> {};
+template <>
+struct PtrToArg<uint64_t> : Internal::PtrToArgDirect<uint64_t> {};
 // Float types
-MAKE_PTRARGCONV(float, double);
-MAKE_PTRARG(double);
+template <>
+struct PtrToArg<float> : Internal::PtrToArgConvert<float, double> {};
+template <>
+struct PtrToArg<double> : Internal::PtrToArgDirect<double> {};
 
-MAKE_PTRARG(String);
-MAKE_PTRARG(Vector2);
-MAKE_PTRARG(Vector2i);
-MAKE_PTRARG(Rect2);
-MAKE_PTRARG(Rect2i);
-MAKE_PTRARG_BY_REFERENCE(Vector3);
-MAKE_PTRARG_BY_REFERENCE(Vector3i);
-MAKE_PTRARG_BY_REFERENCE(Vector4);
-MAKE_PTRARG_BY_REFERENCE(Vector4i);
-MAKE_PTRARG(Transform2D);
-MAKE_PTRARG(Projection);
-MAKE_PTRARG_BY_REFERENCE(Plane);
-MAKE_PTRARG(Quaternion);
-MAKE_PTRARG_BY_REFERENCE(AABB);
-MAKE_PTRARG_BY_REFERENCE(Basis);
-MAKE_PTRARG_BY_REFERENCE(Transform3D);
-MAKE_PTRARG_BY_REFERENCE(Color);
-MAKE_PTRARG(StringName);
-MAKE_PTRARG(NodePath);
-MAKE_PTRARG(RID);
+template <>
+struct PtrToArg<String> : Internal::PtrToArgDirect<String> {};
+template <>
+struct PtrToArg<Vector2> : Internal::PtrToArgDirect<Vector2> {};
+template <>
+struct PtrToArg<Vector2i> : Internal::PtrToArgDirect<Vector2i> {};
+template <>
+struct PtrToArg<Rect2> : Internal::PtrToArgDirect<Rect2> {};
+template <>
+struct PtrToArg<Rect2i> : Internal::PtrToArgDirect<Rect2i> {};
+template <>
+struct PtrToArg<Vector3> : Internal::PtrToArgByReference<Vector3> {};
+template <>
+struct PtrToArg<Vector3i> : Internal::PtrToArgByReference<Vector3i> {};
+template <>
+struct PtrToArg<Vector4> : Internal::PtrToArgByReference<Vector4> {};
+template <>
+struct PtrToArg<Vector4i> : Internal::PtrToArgByReference<Vector4i> {};
+template <>
+struct PtrToArg<Transform2D> : Internal::PtrToArgDirect<Transform2D> {};
+template <>
+struct PtrToArg<Projection> : Internal::PtrToArgDirect<Projection> {};
+template <>
+struct PtrToArg<Plane> : Internal::PtrToArgByReference<Plane> {};
+template <>
+struct PtrToArg<Quaternion> : Internal::PtrToArgDirect<Quaternion> {};
+template <>
+struct PtrToArg<AABB> : Internal::PtrToArgByReference<AABB> {};
+template <>
+struct PtrToArg<Basis> : Internal::PtrToArgByReference<Basis> {};
+template <>
+struct PtrToArg<Transform3D> : Internal::PtrToArgByReference<Transform3D> {};
+template <>
+struct PtrToArg<Color> : Internal::PtrToArgByReference<Color> {};
+template <>
+struct PtrToArg<StringName> : Internal::PtrToArgDirect<StringName> {};
+template <>
+struct PtrToArg<NodePath> : Internal::PtrToArgDirect<NodePath> {};
+template <>
+struct PtrToArg<RID> : Internal::PtrToArgDirect<RID> {};
 // Object doesn't need this.
-MAKE_PTRARG(Callable);
-MAKE_PTRARG(Signal);
-MAKE_PTRARG(Dictionary);
-MAKE_PTRARG(Array);
-MAKE_PTRARG(PackedByteArray);
-MAKE_PTRARG(PackedInt32Array);
-MAKE_PTRARG(PackedInt64Array);
-MAKE_PTRARG(PackedFloat32Array);
-MAKE_PTRARG(PackedFloat64Array);
-MAKE_PTRARG(PackedStringArray);
-MAKE_PTRARG(PackedVector2Array);
-MAKE_PTRARG(PackedVector3Array);
-MAKE_PTRARG(PackedColorArray);
-MAKE_PTRARG(PackedVector4Array);
-MAKE_PTRARG_BY_REFERENCE(Variant);
+template <>
+struct PtrToArg<Callable> : Internal::PtrToArgDirect<Callable> {};
+template <>
+struct PtrToArg<Signal> : Internal::PtrToArgDirect<Signal> {};
+template <>
+struct PtrToArg<Dictionary> : Internal::PtrToArgDirect<Dictionary> {};
+template <>
+struct PtrToArg<Array> : Internal::PtrToArgDirect<Array> {};
+template <>
+struct PtrToArg<PackedByteArray> : Internal::PtrToArgDirect<PackedByteArray> {};
+template <>
+struct PtrToArg<PackedInt32Array> : Internal::PtrToArgDirect<PackedInt32Array> {};
+template <>
+struct PtrToArg<PackedInt64Array> : Internal::PtrToArgDirect<PackedInt64Array> {};
+template <>
+struct PtrToArg<PackedFloat32Array> : Internal::PtrToArgDirect<PackedFloat32Array> {};
+template <>
+struct PtrToArg<PackedFloat64Array> : Internal::PtrToArgDirect<PackedFloat64Array> {};
+template <>
+struct PtrToArg<PackedStringArray> : Internal::PtrToArgDirect<PackedStringArray> {};
+template <>
+struct PtrToArg<PackedVector2Array> : Internal::PtrToArgDirect<PackedVector2Array> {};
+template <>
+struct PtrToArg<PackedVector3Array> : Internal::PtrToArgDirect<PackedVector3Array> {};
+template <>
+struct PtrToArg<PackedColorArray> : Internal::PtrToArgDirect<PackedColorArray> {};
+template <>
+struct PtrToArg<PackedVector4Array> : Internal::PtrToArgDirect<PackedVector4Array> {};
+template <>
+struct PtrToArg<Variant> : Internal::PtrToArgByReference<Variant> {};
 
-MAKE_PTRARGCONV_CONDITIONAL(T, int64_t, std::is_enum_v<T>);
-MAKE_PTRARGCONV_CONDITIONAL(BitField<T>, int64_t, std::is_enum_v<T>);
+template <typename T>
+struct PtrToArg<T, std::enable_if_t<std::is_enum_v<T>>> : Internal::PtrToArgConvert<T, int64_t> {};
+template <typename T>
+struct PtrToArg<BitField<T>, std::enable_if_t<std::is_enum_v<T>>> : Internal::PtrToArgConvert<BitField<T>, int64_t> {};
 
 // This is for Object.
 
@@ -182,147 +284,23 @@ struct PtrToArg<ObjectID> {
 
 // This is for the special cases used by Variant.
 
-// No EncodeT because direct pointer conversion not possible.
-#define MAKE_VECARG(m_type)                                                              \
-	template <>                                                                          \
-	struct PtrToArg<Vector<m_type>> {                                                    \
-		_FORCE_INLINE_ static Vector<m_type> convert(const void *p_ptr) {                \
-			const Vector<m_type> *dvs = reinterpret_cast<const Vector<m_type> *>(p_ptr); \
-			Vector<m_type> ret;                                                          \
-			int len = dvs->size();                                                       \
-			ret.resize(len);                                                             \
-			{                                                                            \
-				const m_type *r = dvs->ptr();                                            \
-				for (int i = 0; i < len; i++) {                                          \
-					ret.write[i] = r[i];                                                 \
-				}                                                                        \
-			}                                                                            \
-			return ret;                                                                  \
-		}                                                                                \
-		_FORCE_INLINE_ static void encode(const Vector<m_type> &p_vec, void *p_ptr) {    \
-			Vector<m_type> *dv = reinterpret_cast<Vector<m_type> *>(p_ptr);              \
-			int len = p_vec.size();                                                      \
-			dv->resize(len);                                                             \
-			{                                                                            \
-				m_type *w = dv->ptrw();                                                  \
-				for (int i = 0; i < len; i++) {                                          \
-					w[i] = p_vec[i];                                                     \
-				}                                                                        \
-			}                                                                            \
-		}                                                                                \
-	};
-
-// No EncodeT because direct pointer conversion not possible.
-#define MAKE_VECARG_ALT(m_type, m_type_alt)                                               \
-	template <>                                                                           \
-	struct PtrToArg<Vector<m_type_alt>> {                                                 \
-		_FORCE_INLINE_ static Vector<m_type_alt> convert(const void *p_ptr) {             \
-			const Vector<m_type> *dvs = reinterpret_cast<const Vector<m_type> *>(p_ptr);  \
-			Vector<m_type_alt> ret;                                                       \
-			int len = dvs->size();                                                        \
-			ret.resize(len);                                                              \
-			{                                                                             \
-				const m_type *r = dvs->ptr();                                             \
-				for (int i = 0; i < len; i++) {                                           \
-					ret.write[i] = r[i];                                                  \
-				}                                                                         \
-			}                                                                             \
-			return ret;                                                                   \
-		}                                                                                 \
-		_FORCE_INLINE_ static void encode(const Vector<m_type_alt> &p_vec, void *p_ptr) { \
-			Vector<m_type> *dv = reinterpret_cast<Vector<m_type> *>(p_ptr);               \
-			int len = p_vec.size();                                                       \
-			dv->resize(len);                                                              \
-			{                                                                             \
-				m_type *w = dv->ptrw();                                                   \
-				for (int i = 0; i < len; i++) {                                           \
-					w[i] = p_vec[i];                                                      \
-				}                                                                         \
-			}                                                                             \
-		}                                                                                 \
-	};
-
-MAKE_VECARG_ALT(String, StringName);
+template <>
+struct PtrToArg<Vector<StringName>> : Internal::PtrToArgVectorConvert<String, StringName> {};
 
 // For stuff that gets converted to Array vectors.
 
-// No EncodeT because direct pointer conversion not possible.
-#define MAKE_VECARR(m_type)                                                           \
-	template <>                                                                       \
-	struct PtrToArg<Vector<m_type>> {                                                 \
-		_FORCE_INLINE_ static Vector<m_type> convert(const void *p_ptr) {             \
-			const Array *arr = reinterpret_cast<const Array *>(p_ptr);                \
-			Vector<m_type> ret;                                                       \
-			int len = arr->size();                                                    \
-			ret.resize(len);                                                          \
-			for (int i = 0; i < len; i++) {                                           \
-				ret.write[i] = (*arr)[i];                                             \
-			}                                                                         \
-			return ret;                                                               \
-		}                                                                             \
-		_FORCE_INLINE_ static void encode(const Vector<m_type> &p_vec, void *p_ptr) { \
-			Array *arr = reinterpret_cast<Array *>(p_ptr);                            \
-			int len = p_vec.size();                                                   \
-			arr->resize(len);                                                         \
-			for (int i = 0; i < len; i++) {                                           \
-				(*arr)[i] = p_vec[i];                                                 \
-			}                                                                         \
-		}                                                                             \
-	};
-
-MAKE_VECARR(Variant);
-MAKE_VECARR(RID);
-MAKE_VECARR(Plane);
-
-// No EncodeT because direct pointer conversion not possible.
-#define MAKE_DVECARR(m_type)                                                          \
-	template <>                                                                       \
-	struct PtrToArg<Vector<m_type>> {                                                 \
-		_FORCE_INLINE_ static Vector<m_type> convert(const void *p_ptr) {             \
-			const Array *arr = reinterpret_cast<const Array *>(p_ptr);                \
-			Vector<m_type> ret;                                                       \
-			int len = arr->size();                                                    \
-			ret.resize(len);                                                          \
-			{                                                                         \
-				m_type *w = ret.ptrw();                                               \
-				for (int i = 0; i < len; i++) {                                       \
-					w[i] = (*arr)[i];                                                 \
-				}                                                                     \
-			}                                                                         \
-			return ret;                                                               \
-		}                                                                             \
-		_FORCE_INLINE_ static void encode(const Vector<m_type> &p_vec, void *p_ptr) { \
-			Array *arr = reinterpret_cast<Array *>(p_ptr);                            \
-			int len = p_vec.size();                                                   \
-			arr->resize(len);                                                         \
-			{                                                                         \
-				const m_type *r = p_vec.ptr();                                        \
-				for (int i = 0; i < len; i++) {                                       \
-					(*arr)[i] = r[i];                                                 \
-				}                                                                     \
-			}                                                                         \
-		}                                                                             \
-	};
+template <>
+struct PtrToArg<Vector<Variant>> : Internal::PtrToArgVectorFromArray<Variant> {};
+template <>
+struct PtrToArg<Vector<RID>> : Internal::PtrToArgVectorFromArray<RID> {};
+template <>
+struct PtrToArg<Vector<Plane>> : Internal::PtrToArgVectorFromArray<Plane> {};
 
 // Special case for IPAddress.
 
-// No EncodeT because direct pointer conversion not possible.
-#define MAKE_STRINGCONV_BY_REFERENCE(m_type)                                  \
-	template <>                                                               \
-	struct PtrToArg<m_type> {                                                 \
-		_FORCE_INLINE_ static m_type convert(const void *p_ptr) {             \
-			m_type s = *reinterpret_cast<const String *>(p_ptr);              \
-			return s;                                                         \
-		}                                                                     \
-		_FORCE_INLINE_ static void encode(const m_type &p_vec, void *p_ptr) { \
-			String *arr = reinterpret_cast<String *>(p_ptr);                  \
-			*arr = p_vec;                                                     \
-		}                                                                     \
-	};
-
-MAKE_STRINGCONV_BY_REFERENCE(IPAddress);
+template <>
+struct PtrToArg<IPAddress> : Internal::PtrToArgStringConvertByReference<IPAddress> {};
 
-// No EncodeT because direct pointer conversion not possible.
 template <>
 struct PtrToArg<Vector<Face3>> {
 	_FORCE_INLINE_ static Vector<Face3> convert(const void *p_ptr) {
@@ -341,6 +319,7 @@ struct PtrToArg<Vector<Face3>> {
 		}
 		return ret;
 	}
+	// No EncodeT because direct pointer conversion not possible.
 	_FORCE_INLINE_ static void encode(const Vector<Face3> &p_vec, void *p_ptr) {
 		Vector<Vector3> *arr = reinterpret_cast<Vector<Vector3> *>(p_ptr);
 		int len = p_vec.size();