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Mark c_min_element, c_max_element, and c_minmax_element as constexpr in C++17.

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This allows them to be used in constant expressions, such as static_asserts.

PiperOrigin-RevId: 649292841
Change-Id: I76e31a94b933fa357276fee534b81c00c28c8b23
This commit is contained in:
Abseil Team
2024-07-03 22:07:51 -07:00
committed by Copybara-Service
parent eb46a63d77
commit 074a32af66
3 changed files with 69 additions and 27 deletions
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36
absl/algorithm/container_test.cc
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@@ -1168,6 +1168,42 @@ TEST(ConstexprTest, Distance) {
// Works at compile time with constexpr containers.
static_assert(absl::c_distance(std::array<int, 3>()) == 3);
}
TEST(ConstexprTest, MinElement) {
constexpr std::array<int, 3> kArray = {1, 2, 3};
static_assert(*absl::c_min_element(kArray) == 1);
}
TEST(ConstexprTest, MinElementWithPredicate) {
constexpr std::array<int, 3> kArray = {1, 2, 3};
static_assert(*absl::c_min_element(kArray, std::greater<int>()) == 3);
}
TEST(ConstexprTest, MaxElement) {
constexpr std::array<int, 3> kArray = {1, 2, 3};
static_assert(*absl::c_max_element(kArray) == 3);
}
TEST(ConstexprTest, MaxElementWithPredicate) {
constexpr std::array<int, 3> kArray = {1, 2, 3};
static_assert(*absl::c_max_element(kArray, std::greater<int>()) == 1);
}
TEST(ConstexprTest, MinMaxElement) {
static constexpr std::array<int, 3> kArray = {1, 2, 3};
constexpr auto kMinMaxPair = absl::c_minmax_element(kArray);
static_assert(*kMinMaxPair.first == 1);
static_assert(*kMinMaxPair.second == 3);
}
TEST(ConstexprTest, MinMaxElementWithPredicate) {
static constexpr std::array<int, 3> kArray = {1, 2, 3};
constexpr auto kMinMaxPair =
absl::c_minmax_element(kArray, std::greater<int>());
static_assert(*kMinMaxPair.first == 3);
static_assert(*kMinMaxPair.second == 1);
}
#endif // defined(ABSL_INTERNAL_CPLUSPLUS_LANG) &&
// ABSL_INTERNAL_CPLUSPLUS_LANG >= 201703L