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authorAbseil Team <absl-team@google.com>2017-10-13T17·21-0700
committerjueminyang <jueminyang@google.com>2017-10-16T16·00-0400
commit6de53819a7173bd446156237a37f53464b7732cc (patch)
treebffe391f131d02a8e16a2236ac9b89856b7fc012 /absl/base/config.h
parent1a9ba5e2e5a14413704f0c913fac53359576d3b6 (diff)
Changes imported from Abseil "staging" branch:
  - 432508bf64998983b3c194d5f164872ce3c2e573 Put visibility tags into absl external build files by Jon Cohen <cohenjon@google.com>
  - 25d59d11e7b833fe632cddb5bf4d76075ae6282b Use ABSL_PREDICT_TRUE instead of *FALSE for the range che... by Jon Cohen <cohenjon@google.com>
  - 8d8a5890a55ddd19aac849748441eeb57c684f10 Better detection for MSVC support on std::optional. by Xiaoyi Zhang <zhangxy@google.com>
  - c1b31e4a97939885c3bbc23ecb093e9619e73ad1 Internal cleanup by Gennadiy Rozental <rogeeff@google.com>
  - 4f56ad20c4eeccc6f5fb21ec6c7191233d34a090 Internal change. by Matt Calabrese <calabrese@google.com>
  - d2a02b52c75c295708170f4d17b7ff442c8d6a97 Fixed a minor typo in the SimpleAtob() function comment. by Abseil Team <absl-team@google.com>
  - 5adbff5c23a45278d06de2ef3a29ea51b0d1269e Internal cleanup by Gennadiy Rozental <rogeeff@google.com>

GitOrigin-RevId: 432508bf64998983b3c194d5f164872ce3c2e573
Change-Id: I32ddd151d3350b96a22e8f1830f19b59374953ad
Diffstat (limited to 'absl/base/config.h')
-rw-r--r--absl/base/config.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/absl/base/config.h b/absl/base/config.h
index 5f0dd04c8e66..495811bd88c3 100644
--- a/absl/base/config.h
+++ b/absl/base/config.h
@@ -372,4 +372,19 @@
 #endif
 #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.
+// 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_STRING_VIEW 1
+#endif
+
 #endif  // ABSL_BASE_CONFIG_H_