Improve readibility of 'final' specifier benchmark

Author: hpwxf

src/final--benchmark.cpp

@@ -10,33 +10,33 @@ struct C : A {
   int f() override { return 1; }
 };
 
-struct D : C {
-  int f() override { return 1; }
+struct D : C {                   // not used; for illustration only
+  int f() override { return 1; } // does not change optimizer behavior
 };
 
-int foo(B *b) { return b->f(); }
+int foo(B &b) { return b.f(); }
 
-int bar(C *c) { return c->f(); }
+int bar(C &c) { return c.f(); }
 
 //#region [Benchmark]
 #include <benchmark/benchmark.h>
 
 static void WithoutFinal(benchmark::State &state) {
-  C *c = new C{};
-  int v = 0;
+  C *c = new C{}; // better optimization if stack allocated;
+  int v = 0;      // here worst case
   for (auto _ : state) {
-    v += bar(c);
+    v += bar(*c);
   }
   benchmark::DoNotOptimize(v);
 }
 // Register the function as a benchmark
 BENCHMARK(WithoutFinal);
 
 static void WithFinal(benchmark::State &state) {
-  B *b = new B{};
-  int v = 0;
+  B *b = new B{}; // better optimization if stack allocated;
+  int v = 0;      // here worst case
   for (auto _ : state) {
-    v += foo(b);
+    v += foo(*b);
   }
   benchmark::DoNotOptimize(v);
 }