Fix wrong namespacing of benchmarking constructor helpers

docs/benchmarks.md

@@ -164,7 +164,7 @@ Note that it is not possible to simply use the same instance for different runs
 and resetting it between each run since that would pollute the measurements with
 the resetting code.
 
-It is also possible to just provide an argument name to the simple `BENCHMARK` macro to get 
+It is also possible to just provide an argument name to the simple `BENCHMARK` macro to get
 the same semantics as providing a callable to `meter.measure` with `int` argument:
 
 ```c++
@@ -185,19 +185,17 @@ construct and destroy objects without dynamic allocation and in a way that lets
 you measure construction and destruction separately.
 
 ```c++
-BENCHMARK_ADVANCED("construct")(Catch::Benchmark::Chronometer meter)
+BENCHMARK_ADVANCED("construct")(Catch::Benchmark::Chronometer meter) {
-{
     std::vector<Catch::Benchmark::storage_for<std::string>> storage(meter.runs());
     meter.measure([&](int i) { storage[i].construct("thing"); });
-})
+};
 
-BENCHMARK_ADVANCED("destroy", [](Catch::Benchmark::Chronometer meter)
+BENCHMARK_ADVANCED("destroy")(Catch::Benchmark::Chronometer meter) {
-{
     std::vector<Catch::Benchmark::destructable_object<std::string>> storage(meter.runs());
     for(auto&& o : storage)
         o.construct("thing");
     meter.measure([&](int i) { storage[i].destruct(); });
-})
+};
 ```
 
 `Catch::Benchmark::storage_for<T>` objects are just pieces of raw storage suitable for `T`

src/catch2/benchmark/catch_constructor.hpp

@@ -14,60 +14,62 @@
 #include <type_traits>
 
 namespace Catch {
-    namespace Detail {
+    namespace Benchmark {
-        template <typename T, bool Destruct>
+        namespace Detail {
-        struct ObjectStorage
+            template <typename T, bool Destruct>
-        {
+            struct ObjectStorage
-            using TStorage = typename std::aligned_storage<sizeof(T), std::alignment_of<T>::value>::type;
-
-            ObjectStorage() : data() {}
-
-            ObjectStorage(const ObjectStorage& other)
             {
-                new(&data) T(other.stored_object());
+                using TStorage = typename std::aligned_storage<sizeof(T), std::alignment_of<T>::value>::type;
-            }
 
-            ObjectStorage(ObjectStorage&& other)
+                ObjectStorage() : data() {}
-            {
-                new(&data) T(std::move(other.stored_object()));
-            }
 
-            ~ObjectStorage() { destruct_on_exit<T>(); }
+                ObjectStorage(const ObjectStorage& other)
+                {
+                    new(&data) T(other.stored_object());
+                }
 
-            template <typename... Args>
+                ObjectStorage(ObjectStorage&& other)
-            void construct(Args&&... args)
+                {
-            {
+                    new(&data) T(std::move(other.stored_object()));
-                new (&data) T(std::forward<Args>(args)...);
+                }
-            }
 
-            template <bool AllowManualDestruction = !Destruct>
+                ~ObjectStorage() { destruct_on_exit<T>(); }
-            typename std::enable_if<AllowManualDestruction>::type destruct()
-            {
-                stored_object().~T();
-            }
 
-        private:
+                template <typename... Args>
-            // If this is a constructor benchmark, destruct the underlying object
+                void construct(Args&&... args)
-            template <typename U>
+                {
-            void destruct_on_exit(typename std::enable_if<Destruct, U>::type* = 0) { destruct<true>(); }
+                    new (&data) T(std::forward<Args>(args)...);
-            // Otherwise, don't
+                }
-            template <typename U>
-            void destruct_on_exit(typename std::enable_if<!Destruct, U>::type* = 0) { }
 
-            T& stored_object()
+                template <bool AllowManualDestruction = !Destruct>
-            {
+                typename std::enable_if<AllowManualDestruction>::type destruct()
-                return *static_cast<T*>(static_cast<void*>(&data));
+                {
-            }
+                    stored_object().~T();
+                }
 
-            TStorage data;
+            private:
-        };
+                // If this is a constructor benchmark, destruct the underlying object
-    }
+                template <typename U>
+                void destruct_on_exit(typename std::enable_if<Destruct, U>::type* = 0) { destruct<true>(); }
+                // Otherwise, don't
+                template <typename U>
+                void destruct_on_exit(typename std::enable_if<!Destruct, U>::type* = 0) { }
 
-    template <typename T>
+                T& stored_object()
-    using storage_for = Detail::ObjectStorage<T, true>;
+                {
+                    return *static_cast<T*>(static_cast<void*>(&data));
+                }
 
-    template <typename T>
+                TStorage data;
-    using destructable_object = Detail::ObjectStorage<T, false>;
+            };
-}
+        } // namespace Detail
+
+        template <typename T>
+        using storage_for = Detail::ObjectStorage<T, true>;
+
+        template <typename T>
+        using destructable_object = Detail::ObjectStorage<T, false>;
+    } // namespace Benchmark
+} // namespace Catch
 
 #endif // TWOBLUECUBES_CATCH_CONSTRUCTOR_HPP_INCLUDED

tests/SelfTest/UsageTests/Benchmark.tests.cpp

@@ -1,5 +1,6 @@
 #include <catch2/catch_test_macros.hpp>
 #include <catch2/benchmark/catch_benchmark.hpp>
+#include <catch2/benchmark/catch_constructor.hpp>
 #include <catch2/catch_generators_specific.hpp>
 
 #include <map>
@@ -127,4 +128,18 @@ TEST_CASE("Benchmark containers", "[!benchmark]") {
             REQUIRE(v[i] == generated);
         }
     }
+
+    SECTION("construct and destroy example") {
+        BENCHMARK_ADVANCED("construct")(Catch::Benchmark::Chronometer meter) {
+            std::vector<Catch::Benchmark::storage_for<std::string>> storage(meter.runs());
+            meter.measure([&](int i) { storage[i].construct("thing"); });
+        };
+
+        BENCHMARK_ADVANCED("destroy")(Catch::Benchmark::Chronometer meter) {
+            std::vector<Catch::Benchmark::destructable_object<std::string>> storage(meter.runs());
+            for(auto&& o : storage)
+                o.construct("thing");
+            meter.measure([&](int i) { storage[i].destruct(); });
+        };
+    }
 }