Add override specifier: pdf subclasses

Author: hollasch

books/RayTracingTheRestOfYourLife.html

@@ -1640,12 +1640,12 @@
         public:
             cosine_pdf(const vec3& w) { uvw.build_from_w(w); }
 
-            virtual double value(const vec3& direction) const {
+            virtual double value(const vec3& direction) const override {
                 auto cosine = dot(unit_vector(direction), uvw.w());
                 return (cosine <= 0) ? 0 : cosine/pi;
             }
 
-            virtual vec3 generate() const {
+            virtual vec3 generate() const override {
                 return uvw.local(random_cosine_direction());
             }
 
@@ -1715,11 +1715,11 @@
         public:
             hittable_pdf(shared_ptr<hittable> p, const point3& origin) : ptr(p), o(origin) {}
 
-            virtual double value(const vec3& direction) const {
+            virtual double value(const vec3& direction) const override {
                 return ptr->pdf_value(o, direction);
             }
 
-            virtual vec3 generate() const {
+            virtual vec3 generate() const override {
                 return ptr->random(o);
             }
 
@@ -1849,11 +1849,11 @@
                 p[1] = p1;
             }
 
-            virtual double value(const vec3& direction) const {
+            virtual double value(const vec3& direction) const override {
                 return 0.5 * p[0]->value(direction) + 0.5 *p[1]->value(direction);
             }
 
-            virtual vec3 generate() const {
+            virtual vec3 generate() const override {
                 if (random_double() < 0.5)
                     return p[0]->generate();
                 else

src/TheRestOfYourLife/pdf.h

@@ -55,12 +55,12 @@ class cosine_pdf : public pdf {
     public:
         cosine_pdf(const vec3& w) { uvw.build_from_w(w); }
 
-        virtual double value(const vec3& direction) const {
+        virtual double value(const vec3& direction) const override {
             auto cosine = dot(unit_vector(direction), uvw.w());
             return (cosine <= 0) ? 0 : cosine/pi;
         }
 
-        virtual vec3 generate() const  {
+        virtual vec3 generate() const override {
             return uvw.local(random_cosine_direction());
         }
 
@@ -73,11 +73,11 @@ class hittable_pdf : public pdf {
     public:
         hittable_pdf(shared_ptr<hittable> p, const point3& origin) : ptr(p), o(origin) {}
 
-        virtual double value(const vec3& direction) const {
+        virtual double value(const vec3& direction) const override {
             return ptr->pdf_value(o, direction);
         }
 
-        virtual vec3 generate() const {
+        virtual vec3 generate() const override {
             return ptr->random(o);
         }
 
@@ -94,11 +94,11 @@ class mixture_pdf : public pdf {
             p[1] = p1;
         }
 
-        virtual double value(const vec3& direction) const {
+        virtual double value(const vec3& direction) const override {
             return 0.5 * p[0]->value(direction) + 0.5 *p[1]->value(direction);
         }
 
-        virtual vec3 generate() const {
+        virtual vec3 generate() const override {
             if (random_double() < 0.5)
                 return p[0]->generate();
             else