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| author | Abseil Team <absl-team@google.com> | 2024-07-01 11:33:54 -0700 |
|---|---|---|
| committer | Copybara-Service <copybara-worker@google.com> | 2024-07-01 11:34:46 -0700 |
| commit | 37ebde53cfcf400ef01b59c80ae3f72039cd90f2 (patch) | |
| tree | 1977c5d4878e02cdaa96ed831f775e47bbd58f57 /absl/algorithm/container_test.cc | |
| parent | a27662352e9caafc264747562162a8a32ef36cb9 (diff) | |
| download | abseil-37ebde53cfcf400ef01b59c80ae3f72039cd90f2.tar.gz abseil-37ebde53cfcf400ef01b59c80ae3f72039cd90f2.tar.bz2 abseil-37ebde53cfcf400ef01b59c80ae3f72039cd90f2.zip | |
Make c_begin, c_end, and c_distance conditionally constexpr.
This allows them to be used in constexpr expressions, such as the following:
```
constexpr int distance = absl::c_distance(std::array<int, 3>());
```
Requires at least C++17 to be constexpr.
PiperOrigin-RevId: 648435141
Change-Id: I8136e351a6dc4c25f06ef895fb449f4f11048480
Diffstat (limited to 'absl/algorithm/container_test.cc')
| -rw-r--r-- | absl/algorithm/container_test.cc | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/absl/algorithm/container_test.cc b/absl/algorithm/container_test.cc index 7e54e2b2..e5e2bf3d 100644 --- a/absl/algorithm/container_test.cc +++ b/absl/algorithm/container_test.cc @@ -15,6 +15,7 @@ #include "absl/algorithm/container.h" #include <algorithm> +#include <array> #include <functional> #include <initializer_list> #include <iterator> @@ -31,6 +32,7 @@ #include "gmock/gmock.h" #include "gtest/gtest.h" #include "absl/base/casts.h" +#include "absl/base/config.h" #include "absl/base/macros.h" #include "absl/memory/memory.h" #include "absl/types/span.h" @@ -1160,4 +1162,13 @@ TEST(MutatingTest, PermutationOperations) { EXPECT_EQ(initial, permuted); } +#if defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \ + ABSL_INTERNAL_CPLUSPLUS_LANG >= 201703L +TEST(ConstexprTest, Distance) { + // Works at compile time with constexpr containers. + static_assert(absl::c_distance(std::array<int, 3>()) == 3); +} +#endif // defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && + // ABSL_INTERNAL_CPLUSPLUS_LANG >= 201703L + } // namespace |