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Fix wrong namespacing of benchmarking constructor helpers

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Joe Burzinski 2019-11-18 22:22:38 -06:00 committed by Martin Hořeňovský
parent ad3f50bbc1
commit 0fbf4f3e15
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3 changed files with 67 additions and 52 deletions
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10
docs/benchmarks.md
View File

@ -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`

92
src/catch2/benchmark/catch_constructor.hpp
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@ -14,60 +14,62 @@
#include <type_traits>
namespace Catch {
namespace Detail {
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)
namespace Benchmark {
namespace Detail {
template <typename T, bool Destruct>
struct ObjectStorage
{
new(&data) T(other.stored_object());
}
using TStorage = typename std::aligned_storage<sizeof(T), std::alignment_of<T>::value>::type;
ObjectStorage(ObjectStorage&& other)
{
new(&data) T(std::move(other.stored_object()));
}
ObjectStorage() : data() {}
~ObjectStorage() { destruct_on_exit<T>(); }
ObjectStorage(const ObjectStorage& other)
{
new(&data) T(other.stored_object());
}
template <typename... Args>
void construct(Args&&... args)
{
new (&data) T(std::forward<Args>(args)...);
}
ObjectStorage(ObjectStorage&& other)
{
new(&data) T(std::move(other.stored_object()));
}
template <bool AllowManualDestruction = !Destruct>
typename std::enable_if<AllowManualDestruction>::type destruct()
{
stored_object().~T();
}
~ObjectStorage() { destruct_on_exit<T>(); }
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... Args>
void construct(Args&&... args)
{
new (&data) T(std::forward<Args>(args)...);
}
T& stored_object()
{
return *static_cast<T*>(static_cast<void*>(&data));
}
template <bool AllowManualDestruction = !Destruct>
typename std::enable_if<AllowManualDestruction>::type destruct()
{
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>
using storage_for = Detail::ObjectStorage<T, true>;
T& stored_object()
{
return *static_cast<T*>(static_cast<void*>(&data));
}
template <typename T>
using destructable_object = Detail::ObjectStorage<T, false>;
}
TStorage data;
};
} // 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

15
tests/SelfTest/UsageTests/Benchmark.tests.cpp
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@ -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(); });
};
}
}