Boxing ObjC structs

platform/darwin/src/MGLGeometry.h

@@ -7,7 +7,7 @@
 NS_ASSUME_NONNULL_BEGIN
 
 /** Defines the area spanned by an `MGLCoordinateBounds`. */
-typedef struct MGLCoordinateSpan {
+typedef struct __attribute__((objc_boxable)) MGLCoordinateSpan {
     /** Latitudes spanned by an `MGLCoordinateBounds`. */
     CLLocationDegrees latitudeDelta;
     /** Longitudes spanned by an `MGLCoordinateBounds`. */
@@ -38,7 +38,7 @@ NS_INLINE BOOL MGLCoordinateSpanEqualToCoordinateSpan(MGLCoordinateSpan span1, M
 extern MGL_EXPORT const MGLCoordinateSpan MGLCoordinateSpanZero;
 
 /** A rectangular area as measured on a two-dimensional map projection. */
-typedef struct MGLCoordinateBounds {
+typedef struct __attribute__((objc_boxable)) MGLCoordinateBounds {
     /** Coordinate at the southwest corner. */
     CLLocationCoordinate2D sw;
     /** Coordinate at the northeast corner. */

platform/darwin/src/MGLLight.h

@@ -27,7 +27,7 @@ typedef NS_ENUM(NSUInteger, MGLLightAnchor) {
  A structure containing information about the position of the light source
  relative to lit geometries.
  */
-typedef struct MGLSphericalPosition {
+typedef struct __attribute__((objc_boxable)) MGLSphericalPosition {
     /** Distance from the center of the base of an object to its light. */
     CGFloat radial;
     /** Position of the light relative to 0° (0° when `MGLLight.anchor` is set to viewport corresponds

platform/darwin/src/MGLOfflinePack.h

@@ -54,7 +54,7 @@ typedef NS_ENUM (NSInteger, MGLOfflinePackState) {
  A structure containing information about an offline pack’s current download
  progress.
  */
-typedef struct MGLOfflinePackProgress {
+typedef struct __attribute__((objc_boxable)) MGLOfflinePackProgress {
     /**
      The number of resources, including tiles, that have been completely
      downloaded and are ready to use offline.

platform/darwin/src/MGLTypes.h

@@ -78,7 +78,7 @@ typedef NS_OPTIONS(NSUInteger, MGLMapDebugMaskOptions) {
 /**
  A structure containing information about a transition.
  */
-typedef struct MGLTransition {
+typedef struct __attribute__((objc_boxable)) MGLTransition {
     /**
      The amount of time the animation should take, not including the delay.
      */

platform/darwin/test/MGLLightTest.mm

@@ -132,9 +132,9 @@ - (void)testProperties {
 - (void)testValueAdditions {
     MGLSphericalPosition position = MGLSphericalPositionMake(1.15, 210, 30);
 
-    XCTAssertEqual([NSValue valueWithMGLSphericalPosition:position].MGLSphericalPositionValue.radial, position.radial);
-    XCTAssertEqual([NSValue valueWithMGLSphericalPosition:position].MGLSphericalPositionValue.azimuthal, position.azimuthal);
-    XCTAssertEqual([NSValue valueWithMGLSphericalPosition:position].MGLSphericalPositionValue.polar, position.polar);
+    XCTAssertEqual(@(position).MGLSphericalPositionValue.radial, position.radial);
+    XCTAssertEqual(@(position).MGLSphericalPositionValue.azimuthal, position.azimuthal);
+    XCTAssertEqual(@(position).MGLSphericalPositionValue.polar, position.polar);
     XCTAssertEqual([NSValue valueWithMGLLightAnchor:MGLLightAnchorMap].MGLLightAnchorValue, MGLLightAnchorMap);
     XCTAssertEqual([NSValue valueWithMGLLightAnchor:MGLLightAnchorViewport].MGLLightAnchorValue, MGLLightAnchorViewport);
 }