Castable: Optimize Switch()
Use a bloom-filter-style early rejection to eliminate whole blocks of
case statements from the switch type checks. Much like IsAnyOf(), the
list of types considered are recursively tested as a whole and
then binary-chopped if there's a potential match, until we test the
individual switch case types.
Bug: tint:1383
Change-Id: I5b30f19ea070e8352bf6b9363f133da906013182
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/78544
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: David Neto <dneto@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Commit-Queue: Ben Clayton <bclayton@chromium.org>
diff --git a/src/castable.h b/src/castable.h
index 04f2dcc..fb893cb 100644
--- a/src/castable.h
+++ b/src/castable.h
@@ -465,6 +465,131 @@
/// ```
struct Default {};
+namespace detail {
+
+/// Evaluates to the Switch case type being matched by the switch case function
+/// `FN`.
+/// @note does not handle the Default case
+/// @see Switch().
+template <typename FN>
+using SwitchCaseType = std::remove_const_t<std::remove_pointer_t<
+ traits::ParameterType<std::remove_reference_t<FN>, 0>>>;
+
+/// Evaluates to true if the function `FN` has the signature of a Default case
+/// in a Switch().
+/// @see Switch().
+template <typename FN>
+inline constexpr bool IsDefaultCase =
+ std::is_same_v<traits::ParameterType<std::remove_reference_t<FN>, 0>,
+ Default>;
+
+/// Searches the list of Switch cases for a Default case, returning the index of
+/// the Default case. If the a Default case is not found in the tuple, then -1
+/// is returned.
+template <typename TUPLE, std::size_t START_IDX = 0>
+constexpr int IndexOfDefaultCase() {
+ if constexpr (START_IDX < std::tuple_size_v<TUPLE>) {
+ return IsDefaultCase<std::tuple_element_t<START_IDX, TUPLE>>
+ ? static_cast<int>(START_IDX)
+ : IndexOfDefaultCase<TUPLE, START_IDX + 1>();
+ } else {
+ return -1;
+ }
+}
+
+/// The implementation of Switch() for non-Default cases.
+/// Switch splits the cases into two a low and high block of cases, and quickly
+/// rules out blocks that cannot match by comparing the TypeInfo::HashCode of
+/// the object and the cases in the block. If a block of cases may match the
+/// given object's type, then that block is split into two, and the process
+/// recurses. When NonDefaultCases() is called with a single case, then As<>
+/// will be used to dynamically cast to the case type and if the cast succeeds,
+/// then the case handler is called.
+/// @returns true if a case handler was found, otherwise false.
+template <typename T, typename RETURN_TYPE, typename... CASES>
+inline bool NonDefaultCases(T* object,
+ const TypeInfo* type,
+ RETURN_TYPE* result,
+ std::tuple<CASES...>&& cases) {
+ using Cases = std::tuple<CASES...>;
+
+ (void)result; // Not always used, avoid warning.
+
+ static constexpr bool kHasReturnType = !std::is_same_v<RETURN_TYPE, void>;
+ static constexpr size_t kNumCases = sizeof...(CASES);
+
+ if constexpr (kNumCases == 0) {
+ // No cases. Nothing to do.
+ return false;
+ } else if constexpr (kNumCases == 1) { // NOLINT: cpplint doesn't understand
+ // `else if constexpr`
+ // Single case.
+ using CaseFunc = std::tuple_element_t<0, Cases>;
+ static_assert(!IsDefaultCase<CaseFunc>,
+ "NonDefaultCases called with a Default case");
+ // Attempt to dynamically cast the object to the handler type. If that
+ // succeeds, call the case handler with the cast object.
+ using CaseType = SwitchCaseType<CaseFunc>;
+ if (auto* ptr = As<CaseType>(object)) {
+ if constexpr (kHasReturnType) {
+ *result = std::get<0>(cases)(ptr);
+ } else {
+ std::get<0>(cases)(ptr);
+ }
+ return true;
+ }
+ return false;
+ } else {
+ // Multiple cases.
+ // Check the hashcode bits to see if there's any possibility of a case
+ // matching in these cases. If there isn't, we can skip all these cases.
+ if (type->full_hashcode &
+ TypeInfo::CombinedHashCodeOf<SwitchCaseType<CASES>...>()) {
+ // There's a possibility. We need to scan further.
+ // Split the cases into two, and recurse.
+ constexpr size_t kMid = kNumCases / 2;
+ return NonDefaultCases(object, type, result,
+ traits::Slice<0, kMid>(cases)) ||
+ NonDefaultCases(object, type, result,
+ traits::Slice<kMid, kNumCases - kMid>(cases));
+ } else {
+ return false;
+ }
+ }
+}
+
+/// The implementation of Switch() for all cases.
+/// @see NonDefaultCases
+template <typename T, typename RETURN_TYPE, typename... CASES>
+inline void SwitchCases(T* object,
+ const TypeInfo* type,
+ RETURN_TYPE* result,
+ std::tuple<CASES...>&& cases) {
+ using Cases = std::tuple<CASES...>;
+ static constexpr int kDefaultIndex = detail::IndexOfDefaultCase<Cases>();
+ static_assert(kDefaultIndex == -1 || std::tuple_size_v<Cases> - 1,
+ "Default case must be last in Switch()");
+ static constexpr bool kHasDefaultCase = kDefaultIndex >= 0;
+ static constexpr bool kHasReturnType = !std::is_same_v<RETURN_TYPE, void>;
+
+ if constexpr (kHasDefaultCase) {
+ // Evaluate non-default cases.
+ if (!detail::NonDefaultCases<T>(object, type, result,
+ traits::Slice<0, kDefaultIndex>(cases))) {
+ // Nothing matched. Evaluate default case.
+ if constexpr (kHasReturnType) {
+ *result = std::get<kDefaultIndex>(cases)({});
+ } else {
+ std::get<kDefaultIndex>(cases)({});
+ }
+ }
+ } else {
+ detail::NonDefaultCases<T>(object, type, result, std::move(cases));
+ }
+}
+
+} // namespace detail
+
/// Switch is used to dispatch one of the provided callback case handler
/// functions based on the type of `object` and the parameter type of the case
/// handlers. Switch will sequentially check the type of `object` against each
@@ -493,62 +618,26 @@
/// ```
///
/// @param object the object who's type is used to
-/// @param first_case the first switch case
-/// @param other_cases additional switch cases (optional)
+/// @param cases the switch cases
/// @return the value returned by the called case. If no cases matched, then the
/// zero value for the consistent case type.
-template <typename T, typename FIRST_CASE, typename... OTHER_CASES>
-traits::ReturnType<FIRST_CASE> //
-Switch(T* object, FIRST_CASE&& first_case, OTHER_CASES&&... other_cases) {
- using ReturnType = traits::ReturnType<FIRST_CASE>;
- using CaseType = std::remove_pointer_t<traits::ParameterType<FIRST_CASE, 0>>;
+template <typename T, typename... CASES>
+inline auto Switch(T* object, CASES&&... cases) {
+ using Cases = std::tuple<CASES...>;
+ using ReturnType = traits::ReturnType<std::tuple_element_t<0, Cases>>;
static constexpr bool kHasReturnType = !std::is_same_v<ReturnType, void>;
- static_assert(traits::SignatureOfT<FIRST_CASE>::parameter_count == 1,
- "Switch case must have a single parameter");
- if constexpr (std::is_same_v<CaseType, Default>) {
- // Default case. Must be last.
- (void)object; // 'object' is not used by the Default case.
- static_assert(sizeof...(other_cases) == 0,
- "Switch Default case must come last");
- if constexpr (kHasReturnType) {
- return first_case({});
- } else {
- first_case({});
- return;
- }
+
+ auto& type = object->TypeInfo();
+
+ if constexpr (kHasReturnType) {
+ ReturnType res = {};
+ detail::SwitchCases(object, &type, &res,
+ std::forward_as_tuple(std::forward<CASES>(cases)...));
+ return res;
} else {
- // Regular case.
- static_assert(traits::IsTypeOrDerived<CaseType, CastableBase>::value,
- "Switch case parameter is not a Castable pointer");
- // Does the case match?
- if (auto* ptr = As<CaseType>(object)) {
- if constexpr (kHasReturnType) {
- return first_case(ptr);
- } else {
- first_case(ptr);
- return;
- }
- }
- // Case did not match. Got any more cases to try?
- if constexpr (sizeof...(other_cases) > 0) {
- // Try the next cases...
- if constexpr (kHasReturnType) {
- auto res = Switch(object, std::forward<OTHER_CASES>(other_cases)...);
- static_assert(std::is_same_v<decltype(res), ReturnType>,
- "Switch case types do not have consistent return type");
- return res;
- } else {
- Switch(object, std::forward<OTHER_CASES>(other_cases)...);
- return;
- }
- } else {
- // That was the last case. No cases matched.
- if constexpr (kHasReturnType) {
- return {};
- } else {
- return;
- }
- }
+ detail::SwitchCases<T, void>(
+ object, &type, nullptr,
+ std::forward_as_tuple(std::forward<CASES>(cases)...));
}
}
diff --git a/src/traits.h b/src/traits.h
index 4d2cbab..f8e52a6 100644
--- a/src/traits.h
+++ b/src/traits.h
@@ -124,16 +124,20 @@
namespace detail {
/// @returns the tuple `t` swizzled by `INDICES`
-template <class TUPLE, std::size_t... INDICES>
-constexpr auto Swizzle(TUPLE&& t, std::index_sequence<INDICES...>) {
- return std::make_tuple(std::get<INDICES>(std::forward<TUPLE>(t))...);
+template <typename TUPLE, std::size_t... INDICES>
+constexpr auto Swizzle(TUPLE&& t, std::index_sequence<INDICES...>)
+ -> std::tuple<
+ std::tuple_element_t<INDICES, std::remove_reference_t<TUPLE>>...> {
+ return {std::forward<
+ std::tuple_element_t<INDICES, std::remove_reference_t<TUPLE>>>(
+ std::get<INDICES>(std::forward<TUPLE>(t)))...};
}
/// @returns a nullptr of the tuple type `TUPLE` swizzled by `INDICES`.
/// @note: This function is intended to be used in a `decltype()` expression,
/// and returns a pointer-to-tuple as the tuple may hold non-constructable
/// types.
-template <class TUPLE, std::size_t... INDICES>
+template <typename TUPLE, std::size_t... INDICES>
constexpr auto* SwizzlePtrTy(std::index_sequence<INDICES...>) {
using Swizzled = std::tuple<std::tuple_element_t<INDICES, TUPLE>...>;
return static_cast<Swizzled*>(nullptr);
diff --git a/src/traits_test.cc b/src/traits_test.cc
index 7453866..eab43a1 100644
--- a/src/traits_test.cc
+++ b/src/traits_test.cc
@@ -28,14 +28,14 @@
TEST(ParamType, Function) {
F1({}); // Avoid unused method warning
F3(0, {}, 0); // Avoid unused method warning
- static_assert(std::is_same_v<ParameterType<decltype(&F1), 0>, S>, "");
- static_assert(std::is_same_v<ParameterType<decltype(&F3), 0>, int>, "");
- static_assert(std::is_same_v<ParameterType<decltype(&F3), 1>, S>, "");
- static_assert(std::is_same_v<ParameterType<decltype(&F3), 2>, float>, "");
- static_assert(std::is_same_v<ReturnType<decltype(&F1)>, void>, "");
- static_assert(std::is_same_v<ReturnType<decltype(&F3)>, void>, "");
- static_assert(SignatureOfT<decltype(&F1)>::parameter_count == 1, "");
- static_assert(SignatureOfT<decltype(&F3)>::parameter_count == 3, "");
+ static_assert(std::is_same_v<ParameterType<decltype(&F1), 0>, S>);
+ static_assert(std::is_same_v<ParameterType<decltype(&F3), 0>, int>);
+ static_assert(std::is_same_v<ParameterType<decltype(&F3), 1>, S>);
+ static_assert(std::is_same_v<ParameterType<decltype(&F3), 2>, float>);
+ static_assert(std::is_same_v<ReturnType<decltype(&F1)>, void>);
+ static_assert(std::is_same_v<ReturnType<decltype(&F3)>, void>);
+ static_assert(SignatureOfT<decltype(&F1)>::parameter_count == 1);
+ static_assert(SignatureOfT<decltype(&F3)>::parameter_count == 3);
}
TEST(ParamType, Method) {
@@ -46,14 +46,14 @@
};
C().F1({}); // Avoid unused method warning
C().F3(0, {}, 0); // Avoid unused method warning
- static_assert(std::is_same_v<ParameterType<decltype(&C::F1), 0>, S>, "");
- static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 0>, int>, "");
- static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 1>, S>, "");
- static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 2>, float>, "");
- static_assert(std::is_same_v<ReturnType<decltype(&C::F1)>, void>, "");
- static_assert(std::is_same_v<ReturnType<decltype(&C::F3)>, void>, "");
- static_assert(SignatureOfT<decltype(&C::F1)>::parameter_count == 1, "");
- static_assert(SignatureOfT<decltype(&C::F3)>::parameter_count == 3, "");
+ static_assert(std::is_same_v<ParameterType<decltype(&C::F1), 0>, S>);
+ static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 0>, int>);
+ static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 1>, S>);
+ static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 2>, float>);
+ static_assert(std::is_same_v<ReturnType<decltype(&C::F1)>, void>);
+ static_assert(std::is_same_v<ReturnType<decltype(&C::F3)>, void>);
+ static_assert(SignatureOfT<decltype(&C::F1)>::parameter_count == 1);
+ static_assert(SignatureOfT<decltype(&C::F3)>::parameter_count == 3);
}
TEST(ParamType, ConstMethod) {
@@ -64,14 +64,14 @@
};
C().F1({}); // Avoid unused method warning
C().F3(0, {}, 0); // Avoid unused method warning
- static_assert(std::is_same_v<ParameterType<decltype(&C::F1), 0>, S>, "");
- static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 0>, int>, "");
- static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 1>, S>, "");
- static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 2>, float>, "");
- static_assert(std::is_same_v<ReturnType<decltype(&C::F1)>, void>, "");
- static_assert(std::is_same_v<ReturnType<decltype(&C::F3)>, void>, "");
- static_assert(SignatureOfT<decltype(&C::F1)>::parameter_count == 1, "");
- static_assert(SignatureOfT<decltype(&C::F3)>::parameter_count == 3, "");
+ static_assert(std::is_same_v<ParameterType<decltype(&C::F1), 0>, S>);
+ static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 0>, int>);
+ static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 1>, S>);
+ static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 2>, float>);
+ static_assert(std::is_same_v<ReturnType<decltype(&C::F1)>, void>);
+ static_assert(std::is_same_v<ReturnType<decltype(&C::F3)>, void>);
+ static_assert(SignatureOfT<decltype(&C::F1)>::parameter_count == 1);
+ static_assert(SignatureOfT<decltype(&C::F3)>::parameter_count == 3);
}
TEST(ParamType, StaticMethod) {
@@ -82,55 +82,55 @@
};
C::F1({}); // Avoid unused method warning
C::F3(0, {}, 0); // Avoid unused method warning
- static_assert(std::is_same_v<ParameterType<decltype(&C::F1), 0>, S>, "");
- static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 0>, int>, "");
- static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 1>, S>, "");
- static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 2>, float>, "");
- static_assert(std::is_same_v<ReturnType<decltype(&C::F1)>, void>, "");
- static_assert(std::is_same_v<ReturnType<decltype(&C::F3)>, void>, "");
- static_assert(SignatureOfT<decltype(&C::F1)>::parameter_count == 1, "");
- static_assert(SignatureOfT<decltype(&C::F3)>::parameter_count == 3, "");
+ static_assert(std::is_same_v<ParameterType<decltype(&C::F1), 0>, S>);
+ static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 0>, int>);
+ static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 1>, S>);
+ static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 2>, float>);
+ static_assert(std::is_same_v<ReturnType<decltype(&C::F1)>, void>);
+ static_assert(std::is_same_v<ReturnType<decltype(&C::F3)>, void>);
+ static_assert(SignatureOfT<decltype(&C::F1)>::parameter_count == 1);
+ static_assert(SignatureOfT<decltype(&C::F3)>::parameter_count == 3);
}
TEST(ParamType, FunctionLike) {
using F1 = std::function<void(S)>;
using F3 = std::function<void(int, S, float)>;
- static_assert(std::is_same_v<ParameterType<F1, 0>, S>, "");
- static_assert(std::is_same_v<ParameterType<F3, 0>, int>, "");
- static_assert(std::is_same_v<ParameterType<F3, 1>, S>, "");
- static_assert(std::is_same_v<ParameterType<F3, 2>, float>, "");
- static_assert(std::is_same_v<ReturnType<F1>, void>, "");
- static_assert(std::is_same_v<ReturnType<F3>, void>, "");
- static_assert(SignatureOfT<F1>::parameter_count == 1, "");
- static_assert(SignatureOfT<F3>::parameter_count == 3, "");
+ static_assert(std::is_same_v<ParameterType<F1, 0>, S>);
+ static_assert(std::is_same_v<ParameterType<F3, 0>, int>);
+ static_assert(std::is_same_v<ParameterType<F3, 1>, S>);
+ static_assert(std::is_same_v<ParameterType<F3, 2>, float>);
+ static_assert(std::is_same_v<ReturnType<F1>, void>);
+ static_assert(std::is_same_v<ReturnType<F3>, void>);
+ static_assert(SignatureOfT<F1>::parameter_count == 1);
+ static_assert(SignatureOfT<F3>::parameter_count == 3);
}
TEST(ParamType, Lambda) {
auto l1 = [](S) {};
auto l3 = [](int, S, float) {};
- static_assert(std::is_same_v<ParameterType<decltype(l1), 0>, S>, "");
- static_assert(std::is_same_v<ParameterType<decltype(l3), 0>, int>, "");
- static_assert(std::is_same_v<ParameterType<decltype(l3), 1>, S>, "");
- static_assert(std::is_same_v<ParameterType<decltype(l3), 2>, float>, "");
- static_assert(std::is_same_v<ReturnType<decltype(l1)>, void>, "");
- static_assert(std::is_same_v<ReturnType<decltype(l3)>, void>, "");
- static_assert(SignatureOfT<decltype(l1)>::parameter_count == 1, "");
- static_assert(SignatureOfT<decltype(l3)>::parameter_count == 3, "");
+ static_assert(std::is_same_v<ParameterType<decltype(l1), 0>, S>);
+ static_assert(std::is_same_v<ParameterType<decltype(l3), 0>, int>);
+ static_assert(std::is_same_v<ParameterType<decltype(l3), 1>, S>);
+ static_assert(std::is_same_v<ParameterType<decltype(l3), 2>, float>);
+ static_assert(std::is_same_v<ReturnType<decltype(l1)>, void>);
+ static_assert(std::is_same_v<ReturnType<decltype(l3)>, void>);
+ static_assert(SignatureOfT<decltype(l1)>::parameter_count == 1);
+ static_assert(SignatureOfT<decltype(l3)>::parameter_count == 3);
}
TEST(Slice, Empty) {
auto sliced = Slice<0, 0>(std::make_tuple<>());
- static_assert(std::tuple_size_v<decltype(sliced)> == 0, "");
+ static_assert(std::tuple_size_v<decltype(sliced)> == 0);
}
TEST(Slice, SingleElementSliceEmpty) {
auto sliced = Slice<0, 0>(std::make_tuple<int>(1));
- static_assert(std::tuple_size_v<decltype(sliced)> == 0, "");
+ static_assert(std::tuple_size_v<decltype(sliced)> == 0);
}
TEST(Slice, SingleElementSliceFull) {
auto sliced = Slice<0, 1>(std::make_tuple<int>(1));
- static_assert(std::tuple_size_v<decltype(sliced)> == 1, "");
+ static_assert(std::tuple_size_v<decltype(sliced)> == 1);
static_assert(std::is_same_v<std::tuple_element_t<0, decltype(sliced)>, int>,
"");
EXPECT_EQ(std::get<0>(sliced), 1);
@@ -138,18 +138,18 @@
TEST(Slice, MixedTupleSliceEmpty) {
auto sliced = Slice<1, 0>(std::make_tuple<int, bool, float>(1, true, 2.0f));
- static_assert(std::tuple_size_v<decltype(sliced)> == 0, "");
+ static_assert(std::tuple_size_v<decltype(sliced)> == 0);
}
TEST(Slice, MixedTupleSliceFull) {
auto sliced = Slice<0, 3>(std::make_tuple<int, bool, float>(1, true, 2.0f));
- static_assert(std::tuple_size_v<decltype(sliced)> == 3, "");
+ static_assert(std::tuple_size_v<decltype(sliced)> == 3);
static_assert(std::is_same_v<std::tuple_element_t<0, decltype(sliced)>, int>,
"");
static_assert(std::is_same_v<std::tuple_element_t<1, decltype(sliced)>, bool>,
"");
static_assert(
- std::is_same_v<std::tuple_element_t<2, decltype(sliced)>, float>, "");
+ std::is_same_v<std::tuple_element_t<2, decltype(sliced)>, float>);
EXPECT_EQ(std::get<0>(sliced), 1);
EXPECT_EQ(std::get<1>(sliced), true);
EXPECT_EQ(std::get<2>(sliced), 2.0f);
@@ -157,7 +157,7 @@
TEST(Slice, MixedTupleSliceLowPart) {
auto sliced = Slice<0, 2>(std::make_tuple<int, bool, float>(1, true, 2.0f));
- static_assert(std::tuple_size_v<decltype(sliced)> == 2, "");
+ static_assert(std::tuple_size_v<decltype(sliced)> == 2);
static_assert(std::is_same_v<std::tuple_element_t<0, decltype(sliced)>, int>,
"");
static_assert(std::is_same_v<std::tuple_element_t<1, decltype(sliced)>, bool>,
@@ -168,56 +168,67 @@
TEST(Slice, MixedTupleSliceHighPart) {
auto sliced = Slice<1, 2>(std::make_tuple<int, bool, float>(1, true, 2.0f));
- static_assert(std::tuple_size_v<decltype(sliced)> == 2, "");
+ static_assert(std::tuple_size_v<decltype(sliced)> == 2);
static_assert(std::is_same_v<std::tuple_element_t<0, decltype(sliced)>, bool>,
"");
static_assert(
- std::is_same_v<std::tuple_element_t<1, decltype(sliced)>, float>, "");
+ std::is_same_v<std::tuple_element_t<1, decltype(sliced)>, float>);
EXPECT_EQ(std::get<0>(sliced), true);
EXPECT_EQ(std::get<1>(sliced), 2.0f);
}
+TEST(Slice, PreservesRValueRef) {
+ int i;
+ int& int_ref = i;
+ auto tuple = std::forward_as_tuple(std::move(int_ref));
+ static_assert(std::is_same_v<int&&, //
+ std::tuple_element_t<0, decltype(tuple)>>);
+ auto sliced = Slice<0, 1>(std::move(tuple));
+ static_assert(std::is_same_v<int&&, //
+ std::tuple_element_t<0, decltype(sliced)>>);
+}
+
TEST(SliceTuple, Empty) {
using sliced = SliceTuple<0, 0, std::tuple<>>;
- static_assert(std::tuple_size_v<sliced> == 0, "");
+ static_assert(std::tuple_size_v<sliced> == 0);
}
TEST(SliceTuple, SingleElementSliceEmpty) {
using sliced = SliceTuple<0, 0, std::tuple<int>>;
- static_assert(std::tuple_size_v<sliced> == 0, "");
+ static_assert(std::tuple_size_v<sliced> == 0);
}
TEST(SliceTuple, SingleElementSliceFull) {
using sliced = SliceTuple<0, 1, std::tuple<int>>;
- static_assert(std::tuple_size_v<sliced> == 1, "");
- static_assert(std::is_same_v<std::tuple_element_t<0, sliced>, int>, "");
+ static_assert(std::tuple_size_v<sliced> == 1);
+ static_assert(std::is_same_v<std::tuple_element_t<0, sliced>, int>);
}
TEST(SliceTuple, MixedTupleSliceEmpty) {
using sliced = SliceTuple<1, 0, std::tuple<int, bool, float>>;
- static_assert(std::tuple_size_v<sliced> == 0, "");
+ static_assert(std::tuple_size_v<sliced> == 0);
}
TEST(SliceTuple, MixedTupleSliceFull) {
using sliced = SliceTuple<0, 3, std::tuple<int, bool, float>>;
- static_assert(std::tuple_size_v<sliced> == 3, "");
- static_assert(std::is_same_v<std::tuple_element_t<0, sliced>, int>, "");
- static_assert(std::is_same_v<std::tuple_element_t<1, sliced>, bool>, "");
- static_assert(std::is_same_v<std::tuple_element_t<2, sliced>, float>, "");
+ static_assert(std::tuple_size_v<sliced> == 3);
+ static_assert(std::is_same_v<std::tuple_element_t<0, sliced>, int>);
+ static_assert(std::is_same_v<std::tuple_element_t<1, sliced>, bool>);
+ static_assert(std::is_same_v<std::tuple_element_t<2, sliced>, float>);
}
TEST(SliceTuple, MixedTupleSliceLowPart) {
using sliced = SliceTuple<0, 2, std::tuple<int, bool, float>>;
- static_assert(std::tuple_size_v<sliced> == 2, "");
- static_assert(std::is_same_v<std::tuple_element_t<0, sliced>, int>, "");
- static_assert(std::is_same_v<std::tuple_element_t<1, sliced>, bool>, "");
+ static_assert(std::tuple_size_v<sliced> == 2);
+ static_assert(std::is_same_v<std::tuple_element_t<0, sliced>, int>);
+ static_assert(std::is_same_v<std::tuple_element_t<1, sliced>, bool>);
}
TEST(SliceTuple, MixedTupleSliceHighPart) {
using sliced = SliceTuple<1, 2, std::tuple<int, bool, float>>;
- static_assert(std::tuple_size_v<sliced> == 2, "");
- static_assert(std::is_same_v<std::tuple_element_t<0, sliced>, bool>, "");
- static_assert(std::is_same_v<std::tuple_element_t<1, sliced>, float>, "");
+ static_assert(std::tuple_size_v<sliced> == 2);
+ static_assert(std::is_same_v<std::tuple_element_t<0, sliced>, bool>);
+ static_assert(std::is_same_v<std::tuple_element_t<1, sliced>, float>);
}
} // namespace traits
