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Mark non-modifying container algorithms as constexpr for C++20.

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This change marks Abseil's non-modifying sequence operations including
absl::linear_search and absl::c_linear_search as constexpr when building with
C++20.
PiperOrigin-RevId: 659812405
Change-Id: I8dc2cee873f30531b2eb8fb3da12085505a43a1a
This commit is contained in:
Abseil Team
2024-08-05 22:54:56 -07:00
committed by Copybara-Service
parent 809e5de7b9
commit 00478de3e9
4 changed files with 299 additions and 51 deletions
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16
absl/algorithm/algorithm_test.cc
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@@ -14,11 +14,9 @@
#include "absl/algorithm/algorithm.h"
#include <algorithm>
#include <list>
#include <array>
#include <vector>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/base/config.h"
@@ -47,4 +45,16 @@ TEST_F(LinearSearchTest, linear_searchConst) {
absl::linear_search(const_container->begin(), const_container->end(), 4));
}
#if defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \
ABSL_INTERNAL_CPLUSPLUS_LANG >= 202002L
TEST_F(LinearSearchTest, Constexpr) {
static constexpr std::array<int, 3> kArray = {1, 2, 3};
static_assert(absl::linear_search(kArray.begin(), kArray.end(), 3));
static_assert(!absl::linear_search(kArray.begin(), kArray.end(), 4));
}
#endif // defined(ABSL_INTERNAL_CPLUSPLUS_LANG) &&
// ABSL_INTERNAL_CPLUSPLUS_LANG >= 202002L
} // namespace