diff options
| author |  Abseil Team <absl-team@google.com> | 2018-04-20 09:16:52 -0700 |
|---|---|---|
| committer |  Jon Cohen <cohenjon@google.com> | 2018-04-20 12:30:23 -0400 |
| commit | faf0a1b90374eab44e8956973b0e13febdcf3377 (patch) | |
| tree | 63a7fd12a50b15c4a321e8373c1bbd975df0b7ba /absl/base/config.h | |
| parent | 5b535401665cc6aa96d54a5c9b0901153d97210f (diff) | |
- 551e205ef49682a1cb7e6e0cda46957fbcf88edd Release absl::variant. by Xiaoyi Zhang <zhangxy@google.com>
- 01c52f640594d073c6e54c47e7853b25522cf085 Update comments in absl::variant (and minor changes to ab... by Tom Manshreck <shreck@google.com>
- 064465e1e6b158abd8c38fd1942b4fc464b57d6a Documentation change. by Abseil Team <absl-team@google.com>
- 58df2c8a27e80c9ea21d87c1acee8019246377c9 Relocates SetCountdown and UnsetCountdown to the exceptio... by Abseil Team <absl-team@google.com>
- fd9d248d0948d472f2543f7fd9c0ae4a1cd60d01 Clarify thread_annotation.h documentation around local va... by Abseil Team <absl-team@google.com>
- 0d0abaf7f0945ac5f2c5f49e78afe1b326d5aca0 Typo fix in comments. by Abseil Team <absl-team@google.com>
- 67286d587cbd07508a81e5b8147c245a5b5538b4 Internal change. by Xiaoyi Zhang <zhangxy@google.com>
GitOrigin-RevId: 551e205ef49682a1cb7e6e0cda46957fbcf88edd
Change-Id: I1a343b080187293cb5f892a309618b5712e7aa14
Diffstat (limited to 'absl/base/config.h')
| -rw-r--r-- | absl/base/config.h | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/absl/base/config.h b/absl/base/config.h index 500bc8c8..3eb24abf 100644 --- a/absl/base/config.h +++ b/absl/base/config.h @@ -382,6 +382,19 @@ #endif #endif +// ABSL_HAVE_STD_VARIANT +// +// Checks whether C++17 std::optional is available. +#ifdef ABSL_HAVE_STD_VARIANT +#error "ABSL_HAVE_STD_VARIANT cannot be directly set." +#endif + +#ifdef __has_include +#if __has_include(<variant>) && __cplusplus >= 201703L +#define ABSL_HAVE_STD_VARIANT 1 +#endif +#endif + // ABSL_HAVE_STD_STRING_VIEW // // Checks whether C++17 std::string_view is available. @@ -396,17 +409,18 @@ #endif // For MSVC, `__has_include` is supported in VS 2017 15.3, which is later than -// the support for <optional>, <any>, <string_view>. So we use _MSC_VER to check -// whether we have VS 2017 RTM (when <optional>, <any>, <string_view> is -// implemented) or higher. -// Also, `__cplusplus` is not correctly set by MSVC, so we use `_MSVC_LANG` to -// check the language version. +// the support for <optional>, <any>, <string_view>, <variant>. So we use +// _MSC_VER to check whether we have VS 2017 RTM (when <optional>, <any>, +// <string_view>, <variant> is implemented) or higher. Also, `__cplusplus` is +// not correctly set by MSVC, so we use `_MSVC_LANG` to check the language +// version. // TODO(zhangxy): fix tests before enabling aliasing for `std::any`, // `std::string_view`. #if defined(_MSC_VER) && _MSC_VER >= 1910 && \ ((defined(_MSVC_LANG) && _MSVC_LANG > 201402) || __cplusplus > 201402) // #define ABSL_HAVE_STD_ANY 1 #define ABSL_HAVE_STD_OPTIONAL 1 +#define ABSL_HAVE_STD_VARIANT 1 // #define ABSL_HAVE_STD_STRING_VIEW 1 #endif |