#endif
// warn unused result
+#if defined(__has_cpp_attribute)
+#if __has_cpp_attribute(nodiscard)
+#define FOLLY_NODISCARD [[nodiscard]]
+#endif
+#endif
+#if !defined FOLLY_NODISCARD
#if defined(_MSC_VER) && (_MSC_VER >= 1700)
-#define FOLLY_WARN_UNUSED_RESULT _Check_return_
+#define FOLLY_NODISCARD _Check_return_
#elif defined(__clang__) || defined(__GNUC__)
-#define FOLLY_WARN_UNUSED_RESULT __attribute__((__warn_unused_result__))
+#define FOLLY_NODISCARD __attribute__((__warn_unused_result__))
#else
-#define FOLLY_WARN_UNUSED_RESULT
+#define FOLLY_NODISCARD
+#endif
#endif
// target
#elif defined(__clang__) || defined(__GNUC__)
# define FOLLY_PUSH_WARNING _Pragma("GCC diagnostic push")
# define FOLLY_POP_WARNING _Pragma("GCC diagnostic pop")
-#define FOLLY_GCC_DISABLE_WARNING_INTERNAL3(warningName) #warningName
-#define FOLLY_GCC_DISABLE_WARNING_INTERNAL2(warningName) \
- FOLLY_GCC_DISABLE_WARNING_INTERNAL3(warningName)
-#define FOLLY_GCC_DISABLE_WARNING(warningName) \
- _Pragma(FOLLY_GCC_DISABLE_WARNING_INTERNAL2(GCC diagnostic ignored \
- FOLLY_GCC_DISABLE_WARNING_INTERNAL3(-W##warningName)))
+# define FOLLY_GCC_DISABLE_WARNING_INTERNAL2(warningName) #warningName
+# define FOLLY_GCC_DISABLE_WARNING(warningName) \
+ _Pragma( \
+ FOLLY_GCC_DISABLE_WARNING_INTERNAL2(GCC diagnostic ignored warningName))
// Disable the MSVC warnings.
# define FOLLY_MSVC_DISABLE_WARNING(warningNumber)
#else
#ifdef HAVE_SHADOW_LOCAL_WARNINGS
#define FOLLY_GCC_DISABLE_NEW_SHADOW_WARNINGS \
- FOLLY_GCC_DISABLE_WARNING(shadow-compatible-local) \
- FOLLY_GCC_DISABLE_WARNING(shadow-local)
+ FOLLY_GCC_DISABLE_WARNING("-Wshadow-compatible-local") \
+ FOLLY_GCC_DISABLE_WARNING("-Wshadow-local")
#else
#define FOLLY_GCC_DISABLE_NEW_SHADOW_WARNINGS /* empty */
#endif
namespace folly {
+#if __OBJC__
+constexpr auto kIsObjC = true;
+#else
+constexpr auto kIsObjC = false;
+#endif
+
#if defined(__linux__) && !FOLLY_MOBILE
constexpr auto kIsLinux = true;
#else