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>
This commit is contained in:
Ben Clayton
Tint LUCI CQ
parent
b3c99ddfae
commit
3fbe98e657
193
src/castable.h
193
src/castable.h
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@ -465,6 +465,131 @@ class Castable : public BASE {
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/// ```
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struct Default {};
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namespace detail {
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/// Evaluates to the Switch case type being matched by the switch case function
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/// `FN`.
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/// @note does not handle the Default case
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/// @see Switch().
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template <typename FN>
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using SwitchCaseType = std::remove_const_t<std::remove_pointer_t<
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traits::ParameterType<std::remove_reference_t<FN>, 0>>>;
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/// Evaluates to true if the function `FN` has the signature of a Default case
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/// in a Switch().
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/// @see Switch().
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template <typename FN>
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inline constexpr bool IsDefaultCase =
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std::is_same_v<traits::ParameterType<std::remove_reference_t<FN>, 0>,
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Default>;
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/// Searches the list of Switch cases for a Default case, returning the index of
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/// the Default case. If the a Default case is not found in the tuple, then -1
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/// is returned.
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template <typename TUPLE, std::size_t START_IDX = 0>
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constexpr int IndexOfDefaultCase() {
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if constexpr (START_IDX < std::tuple_size_v<TUPLE>) {
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return IsDefaultCase<std::tuple_element_t<START_IDX, TUPLE>>
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? static_cast<int>(START_IDX)
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: IndexOfDefaultCase<TUPLE, START_IDX + 1>();
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} else {
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return -1;
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}
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}
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/// The implementation of Switch() for non-Default cases.
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/// Switch splits the cases into two a low and high block of cases, and quickly
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/// rules out blocks that cannot match by comparing the TypeInfo::HashCode of
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/// the object and the cases in the block. If a block of cases may match the
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/// given object's type, then that block is split into two, and the process
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/// recurses. When NonDefaultCases() is called with a single case, then As<>
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/// will be used to dynamically cast to the case type and if the cast succeeds,
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/// then the case handler is called.
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/// @returns true if a case handler was found, otherwise false.
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template <typename T, typename RETURN_TYPE, typename... CASES>
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inline bool NonDefaultCases(T* object,
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const TypeInfo* type,
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RETURN_TYPE* result,
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std::tuple<CASES...>&& cases) {
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using Cases = std::tuple<CASES...>;
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(void)result; // Not always used, avoid warning.
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static constexpr bool kHasReturnType = !std::is_same_v<RETURN_TYPE, void>;
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static constexpr size_t kNumCases = sizeof...(CASES);
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if constexpr (kNumCases == 0) {
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// No cases. Nothing to do.
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return false;
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} else if constexpr (kNumCases == 1) { // NOLINT: cpplint doesn't understand
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// `else if constexpr`
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// Single case.
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using CaseFunc = std::tuple_element_t<0, Cases>;
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static_assert(!IsDefaultCase<CaseFunc>,
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"NonDefaultCases called with a Default case");
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// Attempt to dynamically cast the object to the handler type. If that
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// succeeds, call the case handler with the cast object.
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using CaseType = SwitchCaseType<CaseFunc>;
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if (auto* ptr = As<CaseType>(object)) {
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if constexpr (kHasReturnType) {
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*result = std::get<0>(cases)(ptr);
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} else {
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std::get<0>(cases)(ptr);
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}
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return true;
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}
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return false;
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} else {
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// Multiple cases.
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// Check the hashcode bits to see if there's any possibility of a case
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// matching in these cases. If there isn't, we can skip all these cases.
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if (type->full_hashcode &
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TypeInfo::CombinedHashCodeOf<SwitchCaseType<CASES>...>()) {
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// There's a possibility. We need to scan further.
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// Split the cases into two, and recurse.
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constexpr size_t kMid = kNumCases / 2;
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return NonDefaultCases(object, type, result,
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traits::Slice<0, kMid>(cases)) ||
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NonDefaultCases(object, type, result,
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traits::Slice<kMid, kNumCases - kMid>(cases));
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} else {
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return false;
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}
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}
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}
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/// The implementation of Switch() for all cases.
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/// @see NonDefaultCases
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template <typename T, typename RETURN_TYPE, typename... CASES>
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inline void SwitchCases(T* object,
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const TypeInfo* type,
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RETURN_TYPE* result,
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std::tuple<CASES...>&& cases) {
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using Cases = std::tuple<CASES...>;
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static constexpr int kDefaultIndex = detail::IndexOfDefaultCase<Cases>();
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static_assert(kDefaultIndex == -1 || std::tuple_size_v<Cases> - 1,
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"Default case must be last in Switch()");
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static constexpr bool kHasDefaultCase = kDefaultIndex >= 0;
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static constexpr bool kHasReturnType = !std::is_same_v<RETURN_TYPE, void>;
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if constexpr (kHasDefaultCase) {
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// Evaluate non-default cases.
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if (!detail::NonDefaultCases<T>(object, type, result,
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traits::Slice<0, kDefaultIndex>(cases))) {
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// Nothing matched. Evaluate default case.
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if constexpr (kHasReturnType) {
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*result = std::get<kDefaultIndex>(cases)({});
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} else {
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std::get<kDefaultIndex>(cases)({});
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}
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}
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} else {
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detail::NonDefaultCases<T>(object, type, result, std::move(cases));
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}
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}
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} // namespace detail
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/// Switch is used to dispatch one of the provided callback case handler
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/// functions based on the type of `object` and the parameter type of the case
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/// handlers. Switch will sequentially check the type of `object` against each
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@ -493,62 +618,26 @@ struct Default {};
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/// ```
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///
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/// @param object the object who's type is used to
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/// @param first_case the first switch case
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/// @param other_cases additional switch cases (optional)
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/// @param cases the switch cases
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/// @return the value returned by the called case. If no cases matched, then the
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/// zero value for the consistent case type.
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template <typename T, typename FIRST_CASE, typename... OTHER_CASES>
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traits::ReturnType<FIRST_CASE> //
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Switch(T* object, FIRST_CASE&& first_case, OTHER_CASES&&... other_cases) {
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using ReturnType = traits::ReturnType<FIRST_CASE>;
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using CaseType = std::remove_pointer_t<traits::ParameterType<FIRST_CASE, 0>>;
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template <typename T, typename... CASES>
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inline auto Switch(T* object, CASES&&... cases) {
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using Cases = std::tuple<CASES...>;
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using ReturnType = traits::ReturnType<std::tuple_element_t<0, Cases>>;
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static constexpr bool kHasReturnType = !std::is_same_v<ReturnType, void>;
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static_assert(traits::SignatureOfT<FIRST_CASE>::parameter_count == 1,
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"Switch case must have a single parameter");
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if constexpr (std::is_same_v<CaseType, Default>) {
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// Default case. Must be last.
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(void)object; // 'object' is not used by the Default case.
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static_assert(sizeof...(other_cases) == 0,
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"Switch Default case must come last");
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if constexpr (kHasReturnType) {
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return first_case({});
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} else {
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first_case({});
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return;
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}
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auto& type = object->TypeInfo();
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if constexpr (kHasReturnType) {
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ReturnType res = {};
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detail::SwitchCases(object, &type, &res,
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std::forward_as_tuple(std::forward<CASES>(cases)...));
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return res;
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} else {
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// Regular case.
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static_assert(traits::IsTypeOrDerived<CaseType, CastableBase>::value,
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"Switch case parameter is not a Castable pointer");
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// Does the case match?
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if (auto* ptr = As<CaseType>(object)) {
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if constexpr (kHasReturnType) {
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return first_case(ptr);
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} else {
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first_case(ptr);
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return;
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}
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}
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// Case did not match. Got any more cases to try?
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if constexpr (sizeof...(other_cases) > 0) {
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// Try the next cases...
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if constexpr (kHasReturnType) {
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auto res = Switch(object, std::forward<OTHER_CASES>(other_cases)...);
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static_assert(std::is_same_v<decltype(res), ReturnType>,
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"Switch case types do not have consistent return type");
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return res;
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} else {
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Switch(object, std::forward<OTHER_CASES>(other_cases)...);
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return;
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}
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} else {
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// That was the last case. No cases matched.
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if constexpr (kHasReturnType) {
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return {};
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} else {
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return;
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}
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}
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detail::SwitchCases<T, void>(
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object, &type, nullptr,
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std::forward_as_tuple(std::forward<CASES>(cases)...));
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}
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}
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12
src/traits.h
12
src/traits.h
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@ -124,16 +124,20 @@ constexpr auto Range() {
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namespace detail {
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/// @returns the tuple `t` swizzled by `INDICES`
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template <class TUPLE, std::size_t... INDICES>
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constexpr auto Swizzle(TUPLE&& t, std::index_sequence<INDICES...>) {
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return std::make_tuple(std::get<INDICES>(std::forward<TUPLE>(t))...);
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template <typename TUPLE, std::size_t... INDICES>
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constexpr auto Swizzle(TUPLE&& t, std::index_sequence<INDICES...>)
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-> std::tuple<
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std::tuple_element_t<INDICES, std::remove_reference_t<TUPLE>>...> {
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return {std::forward<
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std::tuple_element_t<INDICES, std::remove_reference_t<TUPLE>>>(
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std::get<INDICES>(std::forward<TUPLE>(t)))...};
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}
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/// @returns a nullptr of the tuple type `TUPLE` swizzled by `INDICES`.
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/// @note: This function is intended to be used in a `decltype()` expression,
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/// and returns a pointer-to-tuple as the tuple may hold non-constructable
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/// types.
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template <class TUPLE, std::size_t... INDICES>
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template <typename TUPLE, std::size_t... INDICES>
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constexpr auto* SwizzlePtrTy(std::index_sequence<INDICES...>) {
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using Swizzled = std::tuple<std::tuple_element_t<INDICES, TUPLE>...>;
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return static_cast<Swizzled*>(nullptr);
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@ -28,14 +28,14 @@ void F3(int, S, float) {}
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TEST(ParamType, Function) {
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F1({}); // Avoid unused method warning
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F3(0, {}, 0); // Avoid unused method warning
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static_assert(std::is_same_v<ParameterType<decltype(&F1), 0>, S>, "");
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static_assert(std::is_same_v<ParameterType<decltype(&F3), 0>, int>, "");
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static_assert(std::is_same_v<ParameterType<decltype(&F3), 1>, S>, "");
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static_assert(std::is_same_v<ParameterType<decltype(&F3), 2>, float>, "");
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static_assert(std::is_same_v<ReturnType<decltype(&F1)>, void>, "");
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static_assert(std::is_same_v<ReturnType<decltype(&F3)>, void>, "");
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static_assert(SignatureOfT<decltype(&F1)>::parameter_count == 1, "");
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static_assert(SignatureOfT<decltype(&F3)>::parameter_count == 3, "");
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static_assert(std::is_same_v<ParameterType<decltype(&F1), 0>, S>);
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static_assert(std::is_same_v<ParameterType<decltype(&F3), 0>, int>);
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static_assert(std::is_same_v<ParameterType<decltype(&F3), 1>, S>);
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static_assert(std::is_same_v<ParameterType<decltype(&F3), 2>, float>);
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static_assert(std::is_same_v<ReturnType<decltype(&F1)>, void>);
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static_assert(std::is_same_v<ReturnType<decltype(&F3)>, void>);
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static_assert(SignatureOfT<decltype(&F1)>::parameter_count == 1);
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static_assert(SignatureOfT<decltype(&F3)>::parameter_count == 3);
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}
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TEST(ParamType, Method) {
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@ -46,14 +46,14 @@ TEST(ParamType, Method) {
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};
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C().F1({}); // Avoid unused method warning
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C().F3(0, {}, 0); // Avoid unused method warning
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static_assert(std::is_same_v<ParameterType<decltype(&C::F1), 0>, S>, "");
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 0>, int>, "");
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 1>, S>, "");
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 2>, float>, "");
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static_assert(std::is_same_v<ReturnType<decltype(&C::F1)>, void>, "");
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static_assert(std::is_same_v<ReturnType<decltype(&C::F3)>, void>, "");
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static_assert(SignatureOfT<decltype(&C::F1)>::parameter_count == 1, "");
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static_assert(SignatureOfT<decltype(&C::F3)>::parameter_count == 3, "");
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static_assert(std::is_same_v<ParameterType<decltype(&C::F1), 0>, S>);
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 0>, int>);
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 1>, S>);
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 2>, float>);
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static_assert(std::is_same_v<ReturnType<decltype(&C::F1)>, void>);
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static_assert(std::is_same_v<ReturnType<decltype(&C::F3)>, void>);
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static_assert(SignatureOfT<decltype(&C::F1)>::parameter_count == 1);
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static_assert(SignatureOfT<decltype(&C::F3)>::parameter_count == 3);
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}
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TEST(ParamType, ConstMethod) {
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@ -64,14 +64,14 @@ TEST(ParamType, ConstMethod) {
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};
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C().F1({}); // Avoid unused method warning
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C().F3(0, {}, 0); // Avoid unused method warning
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static_assert(std::is_same_v<ParameterType<decltype(&C::F1), 0>, S>, "");
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 0>, int>, "");
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 1>, S>, "");
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 2>, float>, "");
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static_assert(std::is_same_v<ReturnType<decltype(&C::F1)>, void>, "");
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static_assert(std::is_same_v<ReturnType<decltype(&C::F3)>, void>, "");
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static_assert(SignatureOfT<decltype(&C::F1)>::parameter_count == 1, "");
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static_assert(SignatureOfT<decltype(&C::F3)>::parameter_count == 3, "");
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static_assert(std::is_same_v<ParameterType<decltype(&C::F1), 0>, S>);
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 0>, int>);
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 1>, S>);
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 2>, float>);
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static_assert(std::is_same_v<ReturnType<decltype(&C::F1)>, void>);
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static_assert(std::is_same_v<ReturnType<decltype(&C::F3)>, void>);
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static_assert(SignatureOfT<decltype(&C::F1)>::parameter_count == 1);
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static_assert(SignatureOfT<decltype(&C::F3)>::parameter_count == 3);
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}
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TEST(ParamType, StaticMethod) {
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@ -82,55 +82,55 @@ TEST(ParamType, StaticMethod) {
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};
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C::F1({}); // Avoid unused method warning
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C::F3(0, {}, 0); // Avoid unused method warning
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static_assert(std::is_same_v<ParameterType<decltype(&C::F1), 0>, S>, "");
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 0>, int>, "");
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 1>, S>, "");
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 2>, float>, "");
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static_assert(std::is_same_v<ReturnType<decltype(&C::F1)>, void>, "");
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static_assert(std::is_same_v<ReturnType<decltype(&C::F3)>, void>, "");
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static_assert(SignatureOfT<decltype(&C::F1)>::parameter_count == 1, "");
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static_assert(SignatureOfT<decltype(&C::F3)>::parameter_count == 3, "");
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static_assert(std::is_same_v<ParameterType<decltype(&C::F1), 0>, S>);
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 0>, int>);
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 1>, S>);
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static_assert(std::is_same_v<ParameterType<decltype(&C::F3), 2>, float>);
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static_assert(std::is_same_v<ReturnType<decltype(&C::F1)>, void>);
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static_assert(std::is_same_v<ReturnType<decltype(&C::F3)>, void>);
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static_assert(SignatureOfT<decltype(&C::F1)>::parameter_count == 1);
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static_assert(SignatureOfT<decltype(&C::F3)>::parameter_count == 3);
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}
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TEST(ParamType, FunctionLike) {
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using F1 = std::function<void(S)>;
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using F3 = std::function<void(int, S, float)>;
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static_assert(std::is_same_v<ParameterType<F1, 0>, S>, "");
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static_assert(std::is_same_v<ParameterType<F3, 0>, int>, "");
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static_assert(std::is_same_v<ParameterType<F3, 1>, S>, "");
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static_assert(std::is_same_v<ParameterType<F3, 2>, float>, "");
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static_assert(std::is_same_v<ReturnType<F1>, void>, "");
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static_assert(std::is_same_v<ReturnType<F3>, void>, "");
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static_assert(SignatureOfT<F1>::parameter_count == 1, "");
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static_assert(SignatureOfT<F3>::parameter_count == 3, "");
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static_assert(std::is_same_v<ParameterType<F1, 0>, S>);
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static_assert(std::is_same_v<ParameterType<F3, 0>, int>);
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static_assert(std::is_same_v<ParameterType<F3, 1>, S>);
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static_assert(std::is_same_v<ParameterType<F3, 2>, float>);
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static_assert(std::is_same_v<ReturnType<F1>, void>);
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static_assert(std::is_same_v<ReturnType<F3>, void>);
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static_assert(SignatureOfT<F1>::parameter_count == 1);
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static_assert(SignatureOfT<F3>::parameter_count == 3);
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}
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TEST(ParamType, Lambda) {
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auto l1 = [](S) {};
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auto l3 = [](int, S, float) {};
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static_assert(std::is_same_v<ParameterType<decltype(l1), 0>, S>, "");
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||||
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, SingleElementSliceFull) {
|
|||
|
||||
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, MixedTupleSliceFull) {
|
|||
|
||||
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, MixedTupleSliceLowPart) {
|
|||
|
||||
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
|
||||
|
|
|
|||
Loading…
Reference in New Issue