Inline BVH box comparison generic function

Author: hollasch

books/RayTracingTheNextWeek.html

@@ -814,7 +814,7 @@
 function.
 
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ C++
-    bool box_compare(const hittable* a, const hittable* b, int axis) {
+    inline bool box_compare(const hittable* a, const hittable* b, int axis) {
         aabb box_a;
         aabb box_b;
 

src/TheNextWeek/bvh.h

@@ -35,7 +35,7 @@ class bvh_node : public hittable  {
 };
 
 
-bool box_compare(const hittable* a, const hittable* b, int axis) {
+inline bool box_compare(const hittable* a, const hittable* b, int axis) {
     aabb box_a;
     aabb box_b;
 

src/TheRestOfYourLife/bvh.h

@@ -35,7 +35,7 @@ class bvh_node : public hittable  {
 };
 
 
-bool box_compare(const hittable *a, const hittable *b, int axis) {
+inline bool box_compare(const hittable *a, const hittable *b, int axis) {
     aabb box_a;
     aabb box_b;