Use forward declares for vector math types

Adds operators to convert from int vector types to float vector types
as done in the upstream engine implementations.

src/variant/rect2.cpp

@@ -30,6 +30,8 @@
 
 #include <godot_cpp/variant/rect2.hpp>
 
+#include <godot_cpp/variant/rect2i.hpp>
+#include <godot_cpp/variant/string.hpp>
 #include <godot_cpp/variant/transform2d.hpp>
 
 namespace godot {
@@ -268,4 +270,12 @@ next4:
 	return true;
 }
 
+Rect2::operator String() const {
+	return String(position) + ", " + String(size);
+}
+
+Rect2::operator Rect2i() const {
+	return Rect2i(position, size);
+}
+
 } // namespace godot

src/variant/rect2i.cpp

@@ -30,4 +30,17 @@
 
 #include <godot_cpp/variant/rect2i.hpp>
 
-// No implementation left. This is here to add the header as a compiled unit.
+#include <godot_cpp/variant/rect2.hpp>
+#include <godot_cpp/variant/string.hpp>
+
+namespace godot {
+
+Rect2i::operator String() const {
+	return String(position) + ", " + String(size);
+}
+
+Rect2i::operator Rect2() const {
+	return Rect2(position, size);
+}
+
+} // namespace godot

src/variant/vector2.cpp

@@ -28,21 +28,14 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
+#include <godot_cpp/variant/vector2.hpp>
+
 #include <godot_cpp/core/error_macros.hpp>
 #include <godot_cpp/variant/string.hpp>
-#include <godot_cpp/variant/vector2.hpp>
 #include <godot_cpp/variant/vector2i.hpp>
 
 namespace godot {
 
-Vector2::operator String() const {
-	return String::num(x, 5) + ", " + String::num(y, 5);
-}
-
-Vector2::operator Vector2i() const {
-	return Vector2i(x, y);
-}
-
 real_t Vector2::angle() const {
 	return Math::atan2(y, x);
 }
@@ -200,4 +193,12 @@ bool Vector2::is_equal_approx(const Vector2 &p_v) const {
 	return Math::is_equal_approx(x, p_v.x) && Math::is_equal_approx(y, p_v.y);
 }
 
+Vector2::operator String() const {
+	return String::num(x, 5) + ", " + String::num(y, 5);
+}
+
+Vector2::operator Vector2i() const {
+	return Vector2i(x, y);
+}
+
 } // namespace godot

src/variant/vector2i.cpp

@@ -28,15 +28,13 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
-#include <godot_cpp/core/error_macros.hpp>
-#include <godot_cpp/variant/string.hpp>
 #include <godot_cpp/variant/vector2i.hpp>
 
-namespace godot {
+#include <godot_cpp/core/error_macros.hpp>
+#include <godot_cpp/variant/string.hpp>
+#include <godot_cpp/variant/vector2.hpp>
 
-Vector2i::operator String() const {
-	return String::num(x, 0) + ", " + String::num(y, 0);
-}
+namespace godot {
 
 Vector2i Vector2i::operator+(const Vector2i &p_v) const {
 	return Vector2i(x + p_v.x, y + p_v.y);
@@ -107,4 +105,12 @@ bool Vector2i::operator!=(const Vector2i &p_vec2) const {
 	return x != p_vec2.x || y != p_vec2.y;
 }
 
+Vector2i::operator String() const {
+	return String::num(x, 0) + ", " + String::num(y, 0);
+}
+
+Vector2i::operator Vector2() const {
+	return Vector2((real_t)x, (real_t)y);
+}
+
 } // namespace godot

src/variant/vector3.cpp

@@ -28,9 +28,10 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
+#include <godot_cpp/variant/vector3.hpp>
+
 #include <godot_cpp/core/error_macros.hpp>
 #include <godot_cpp/variant/basis.hpp>
-#include <godot_cpp/variant/vector3.hpp>
 #include <godot_cpp/variant/vector3i.hpp>
 
 namespace godot {

src/variant/vector3i.cpp

@@ -28,9 +28,11 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
+#include <godot_cpp/variant/vector3i.hpp>
+
 #include <godot_cpp/core/error_macros.hpp>
 #include <godot_cpp/variant/string.hpp>
-#include <godot_cpp/variant/vector3i.hpp>
+#include <godot_cpp/variant/vector3.hpp>
 
 namespace godot {
 
@@ -56,4 +58,8 @@ Vector3i::operator String() const {
 	return (String::num(x, 0) + ", " + String::num(y, 0) + ", " + String::num(z, 5));
 }
 
+Vector3i::operator Vector3() const {
+	return Vector3((real_t)x, (real_t)y, (real_t)z);
+}
+
 } // namespace godot