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Diffstat (limited to 'absl/types/compare_test.cc')
| -rw-r--r-- | absl/types/compare_test.cc | 315 |
1 files changed, 315 insertions, 0 deletions
diff --git a/absl/types/compare_test.cc b/absl/types/compare_test.cc new file mode 100644 index 00000000..dd0388c1 --- /dev/null +++ b/absl/types/compare_test.cc @@ -0,0 +1,315 @@ +// Copyright 2018 The Abseil Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +#include "absl/types/compare.h" + +#include "gtest/gtest.h" +#include "absl/base/casts.h" + +namespace absl { +namespace { + +// This is necessary to avoid a bunch of lint warnings suggesting that we use +// EXPECT_EQ/etc., which doesn't work in this case because they convert the `0` +// to an int, which can't be converted to the unspecified zero type. +bool Identity(bool b) { return b; } + +TEST(Compare, WeakEquality) { + EXPECT_TRUE(Identity(weak_equality::equivalent == 0)); + EXPECT_TRUE(Identity(0 == weak_equality::equivalent)); + EXPECT_TRUE(Identity(weak_equality::nonequivalent != 0)); + EXPECT_TRUE(Identity(0 != weak_equality::nonequivalent)); +} + +TEST(Compare, StrongEquality) { + EXPECT_TRUE(Identity(strong_equality::equal == 0)); + EXPECT_TRUE(Identity(0 == strong_equality::equal)); + EXPECT_TRUE(Identity(strong_equality::nonequal != 0)); + EXPECT_TRUE(Identity(0 != strong_equality::nonequal)); + EXPECT_TRUE(Identity(strong_equality::equivalent == 0)); + EXPECT_TRUE(Identity(0 == strong_equality::equivalent)); + EXPECT_TRUE(Identity(strong_equality::nonequivalent != 0)); + EXPECT_TRUE(Identity(0 != strong_equality::nonequivalent)); +} + +TEST(Compare, PartialOrdering) { + EXPECT_TRUE(Identity(partial_ordering::less < 0)); + EXPECT_TRUE(Identity(0 > partial_ordering::less)); + EXPECT_TRUE(Identity(partial_ordering::less <= 0)); + EXPECT_TRUE(Identity(0 >= partial_ordering::less)); + EXPECT_TRUE(Identity(partial_ordering::equivalent == 0)); + EXPECT_TRUE(Identity(0 == partial_ordering::equivalent)); + EXPECT_TRUE(Identity(partial_ordering::greater > 0)); + EXPECT_TRUE(Identity(0 < partial_ordering::greater)); + EXPECT_TRUE(Identity(partial_ordering::greater >= 0)); + EXPECT_TRUE(Identity(0 <= partial_ordering::greater)); + EXPECT_TRUE(Identity(partial_ordering::unordered != 0)); + EXPECT_TRUE(Identity(0 != partial_ordering::unordered)); + EXPECT_FALSE(Identity(partial_ordering::unordered < 0)); + EXPECT_FALSE(Identity(0 < partial_ordering::unordered)); + EXPECT_FALSE(Identity(partial_ordering::unordered <= 0)); + EXPECT_FALSE(Identity(0 <= partial_ordering::unordered)); + EXPECT_FALSE(Identity(partial_ordering::unordered > 0)); + EXPECT_FALSE(Identity(0 > partial_ordering::unordered)); + EXPECT_FALSE(Identity(partial_ordering::unordered >= 0)); + EXPECT_FALSE(Identity(0 >= partial_ordering::unordered)); +} + +TEST(Compare, WeakOrdering) { + EXPECT_TRUE(Identity(weak_ordering::less < 0)); + EXPECT_TRUE(Identity(0 > weak_ordering::less)); + EXPECT_TRUE(Identity(weak_ordering::less <= 0)); + EXPECT_TRUE(Identity(0 >= weak_ordering::less)); + EXPECT_TRUE(Identity(weak_ordering::equivalent == 0)); + EXPECT_TRUE(Identity(0 == weak_ordering::equivalent)); + EXPECT_TRUE(Identity(weak_ordering::greater > 0)); + EXPECT_TRUE(Identity(0 < weak_ordering::greater)); + EXPECT_TRUE(Identity(weak_ordering::greater >= 0)); + EXPECT_TRUE(Identity(0 <= weak_ordering::greater)); +} + +TEST(Compare, StrongOrdering) { + EXPECT_TRUE(Identity(strong_ordering::less < 0)); + EXPECT_TRUE(Identity(0 > strong_ordering::less)); + EXPECT_TRUE(Identity(strong_ordering::less <= 0)); + EXPECT_TRUE(Identity(0 >= strong_ordering::less)); + EXPECT_TRUE(Identity(strong_ordering::equal == 0)); + EXPECT_TRUE(Identity(0 == strong_ordering::equal)); + EXPECT_TRUE(Identity(strong_ordering::equivalent == 0)); + EXPECT_TRUE(Identity(0 == strong_ordering::equivalent)); + EXPECT_TRUE(Identity(strong_ordering::greater > 0)); + EXPECT_TRUE(Identity(0 < strong_ordering::greater)); + EXPECT_TRUE(Identity(strong_ordering::greater >= 0)); + EXPECT_TRUE(Identity(0 <= strong_ordering::greater)); +} + +TEST(Compare, Conversions) { + EXPECT_TRUE( + Identity(implicit_cast<weak_equality>(strong_equality::equal) == 0)); + EXPECT_TRUE( + Identity(implicit_cast<weak_equality>(strong_equality::nonequal) != 0)); + EXPECT_TRUE( + Identity(implicit_cast<weak_equality>(strong_equality::equivalent) == 0)); + EXPECT_TRUE(Identity( + implicit_cast<weak_equality>(strong_equality::nonequivalent) != 0)); + + EXPECT_TRUE( + Identity(implicit_cast<weak_equality>(partial_ordering::less) != 0)); + EXPECT_TRUE(Identity( + implicit_cast<weak_equality>(partial_ordering::equivalent) == 0)); + EXPECT_TRUE( + Identity(implicit_cast<weak_equality>(partial_ordering::greater) != 0)); + EXPECT_TRUE( + Identity(implicit_cast<weak_equality>(partial_ordering::unordered) != 0)); + + EXPECT_TRUE(implicit_cast<weak_equality>(weak_ordering::less) != 0); + EXPECT_TRUE( + Identity(implicit_cast<weak_equality>(weak_ordering::equivalent) == 0)); + EXPECT_TRUE( + Identity(implicit_cast<weak_equality>(weak_ordering::greater) != 0)); + + EXPECT_TRUE( + Identity(implicit_cast<partial_ordering>(weak_ordering::less) != 0)); + EXPECT_TRUE( + Identity(implicit_cast<partial_ordering>(weak_ordering::less) < 0)); + EXPECT_TRUE( + Identity(implicit_cast<partial_ordering>(weak_ordering::less) <= 0)); + EXPECT_TRUE(Identity( + implicit_cast<partial_ordering>(weak_ordering::equivalent) == 0)); + EXPECT_TRUE( + Identity(implicit_cast<partial_ordering>(weak_ordering::greater) != 0)); + EXPECT_TRUE( + Identity(implicit_cast<partial_ordering>(weak_ordering::greater) > 0)); + EXPECT_TRUE( + Identity(implicit_cast<partial_ordering>(weak_ordering::greater) >= 0)); + + EXPECT_TRUE( + Identity(implicit_cast<weak_equality>(strong_ordering::less) != 0)); + EXPECT_TRUE( + Identity(implicit_cast<weak_equality>(strong_ordering::equal) == 0)); + EXPECT_TRUE( + Identity(implicit_cast<weak_equality>(strong_ordering::equivalent) == 0)); + EXPECT_TRUE( + Identity(implicit_cast<weak_equality>(strong_ordering::greater) != 0)); + + EXPECT_TRUE( + Identity(implicit_cast<strong_equality>(strong_ordering::less) != 0)); + EXPECT_TRUE( + Identity(implicit_cast<strong_equality>(strong_ordering::equal) == 0)); + EXPECT_TRUE(Identity( + implicit_cast<strong_equality>(strong_ordering::equivalent) == 0)); + EXPECT_TRUE( + Identity(implicit_cast<strong_equality>(strong_ordering::greater) != 0)); + + EXPECT_TRUE( + Identity(implicit_cast<partial_ordering>(strong_ordering::less) != 0)); + EXPECT_TRUE( + Identity(implicit_cast<partial_ordering>(strong_ordering::less) < 0)); + EXPECT_TRUE( + Identity(implicit_cast<partial_ordering>(strong_ordering::less) <= 0)); + EXPECT_TRUE( + Identity(implicit_cast<partial_ordering>(strong_ordering::equal) == 0)); + EXPECT_TRUE(Identity( + implicit_cast<partial_ordering>(strong_ordering::equivalent) == 0)); + EXPECT_TRUE( + Identity(implicit_cast<partial_ordering>(strong_ordering::greater) != 0)); + EXPECT_TRUE( + Identity(implicit_cast<partial_ordering>(strong_ordering::greater) > 0)); + EXPECT_TRUE( + Identity(implicit_cast<partial_ordering>(strong_ordering::greater) >= 0)); + + EXPECT_TRUE( + Identity(implicit_cast<weak_ordering>(strong_ordering::less) != 0)); + EXPECT_TRUE( + Identity(implicit_cast<weak_ordering>(strong_ordering::less) < 0)); + EXPECT_TRUE( + Identity(implicit_cast<weak_ordering>(strong_ordering::less) <= 0)); + EXPECT_TRUE( + Identity(implicit_cast<weak_ordering>(strong_ordering::equal) == 0)); + EXPECT_TRUE( + Identity(implicit_cast<weak_ordering>(strong_ordering::equivalent) == 0)); + EXPECT_TRUE( + Identity(implicit_cast<weak_ordering>(strong_ordering::greater) != 0)); + EXPECT_TRUE( + Identity(implicit_cast<weak_ordering>(strong_ordering::greater) > 0)); + EXPECT_TRUE( + Identity(implicit_cast<weak_ordering>(strong_ordering::greater) >= 0)); +} + +struct WeakOrderingLess { + template <typename T> + absl::weak_ordering operator()(const T &a, const T &b) const { + return a < b ? absl::weak_ordering::less + : a == b ? absl::weak_ordering::equivalent + : absl::weak_ordering::greater; + } +}; + +TEST(CompareResultAsLessThan, SanityTest) { + EXPECT_FALSE(absl::compare_internal::compare_result_as_less_than(false)); + EXPECT_TRUE(absl::compare_internal::compare_result_as_less_than(true)); + + EXPECT_TRUE(absl::compare_internal::compare_result_as_less_than(-1)); + EXPECT_FALSE(absl::compare_internal::compare_result_as_less_than(0)); + EXPECT_FALSE(absl::compare_internal::compare_result_as_less_than(1)); + + EXPECT_TRUE( + absl::compare_internal::compare_result_as_less_than(weak_ordering::less)); + EXPECT_FALSE(absl::compare_internal::compare_result_as_less_than( + weak_ordering::equivalent)); + EXPECT_FALSE(absl::compare_internal::compare_result_as_less_than( + weak_ordering::greater)); +} + +TEST(DoLessThanComparison, SanityTest) { + std::less<int> less; + WeakOrderingLess weak; + + EXPECT_TRUE(absl::compare_internal::do_less_than_comparison(less, -1, 0)); + EXPECT_TRUE(absl::compare_internal::do_less_than_comparison(weak, -1, 0)); + + EXPECT_FALSE(absl::compare_internal::do_less_than_comparison(less, 10, 10)); + EXPECT_FALSE(absl::compare_internal::do_less_than_comparison(weak, 10, 10)); + + EXPECT_FALSE(absl::compare_internal::do_less_than_comparison(less, 10, 5)); + EXPECT_FALSE(absl::compare_internal::do_less_than_comparison(weak, 10, 5)); +} + +TEST(CompareResultAsOrdering, SanityTest) { + EXPECT_TRUE(Identity( + absl::compare_internal::compare_result_as_ordering(-1) < 0)); + EXPECT_FALSE(Identity( + absl::compare_internal::compare_result_as_ordering(-1) == 0)); + EXPECT_FALSE( + Identity(absl::compare_internal::compare_result_as_ordering(-1) > 0)); + EXPECT_TRUE(Identity(absl::compare_internal::compare_result_as_ordering( + weak_ordering::less) < 0)); + EXPECT_FALSE(Identity(absl::compare_internal::compare_result_as_ordering( + weak_ordering::less) == 0)); + EXPECT_FALSE(Identity(absl::compare_internal::compare_result_as_ordering( + weak_ordering::less) > 0)); + + EXPECT_FALSE(Identity( + absl::compare_internal::compare_result_as_ordering(0) < 0)); + EXPECT_TRUE(Identity( + absl::compare_internal::compare_result_as_ordering(0) == 0)); + EXPECT_FALSE(Identity( + absl::compare_internal::compare_result_as_ordering(0) > 0)); + EXPECT_FALSE(Identity(absl::compare_internal::compare_result_as_ordering( + weak_ordering::equivalent) < 0)); + EXPECT_TRUE(Identity(absl::compare_internal::compare_result_as_ordering( + weak_ordering::equivalent) == 0)); + EXPECT_FALSE(Identity(absl::compare_internal::compare_result_as_ordering( + weak_ordering::equivalent) > 0)); + + EXPECT_FALSE(Identity( + absl::compare_internal::compare_result_as_ordering(1) < 0)); + EXPECT_FALSE(Identity( + absl::compare_internal::compare_result_as_ordering(1) == 0)); + EXPECT_TRUE(Identity( + absl::compare_internal::compare_result_as_ordering(1) > 0)); + EXPECT_FALSE(Identity(absl::compare_internal::compare_result_as_ordering( + weak_ordering::greater) < 0)); + EXPECT_FALSE(Identity(absl::compare_internal::compare_result_as_ordering( + weak_ordering::greater) == 0)); + EXPECT_TRUE(Identity(absl::compare_internal::compare_result_as_ordering( + weak_ordering::greater) > 0)); +} + +TEST(DoThreeWayComparison, SanityTest) { + std::less<int> less; + WeakOrderingLess weak; + + EXPECT_TRUE(Identity( + absl::compare_internal::do_three_way_comparison(less, -1, 0) < 0)); + EXPECT_FALSE(Identity( + absl::compare_internal::do_three_way_comparison(less, -1, 0) == 0)); + EXPECT_FALSE(Identity( + absl::compare_internal::do_three_way_comparison(less, -1, 0) > 0)); + EXPECT_TRUE(Identity( + absl::compare_internal::do_three_way_comparison(weak, -1, 0) < 0)); + EXPECT_FALSE(Identity( + absl::compare_internal::do_three_way_comparison(weak, -1, 0) == 0)); + EXPECT_FALSE(Identity( + absl::compare_internal::do_three_way_comparison(weak, -1, 0) > 0)); + + EXPECT_FALSE(Identity( + absl::compare_internal::do_three_way_comparison(less, 10, 10) < 0)); + EXPECT_TRUE(Identity( + absl::compare_internal::do_three_way_comparison(less, 10, 10) == 0)); + EXPECT_FALSE(Identity( + absl::compare_internal::do_three_way_comparison(less, 10, 10) > 0)); + EXPECT_FALSE(Identity( + absl::compare_internal::do_three_way_comparison(weak, 10, 10) < 0)); + EXPECT_TRUE(Identity( + absl::compare_internal::do_three_way_comparison(weak, 10, 10) == 0)); + EXPECT_FALSE(Identity( + absl::compare_internal::do_three_way_comparison(weak, 10, 10) > 0)); + + EXPECT_FALSE(Identity( + absl::compare_internal::do_three_way_comparison(less, 10, 5) < 0)); + EXPECT_FALSE(Identity( + absl::compare_internal::do_three_way_comparison(less, 10, 5) == 0)); + EXPECT_TRUE(Identity( + absl::compare_internal::do_three_way_comparison(less, 10, 5) > 0)); + EXPECT_FALSE(Identity( + absl::compare_internal::do_three_way_comparison(weak, 10, 5) < 0)); + EXPECT_FALSE(Identity( + absl::compare_internal::do_three_way_comparison(weak, 10, 5) == 0)); + EXPECT_TRUE(Identity( + absl::compare_internal::do_three_way_comparison(weak, 10, 5) > 0)); +} + +} // namespace +} // namespace absl |