support using co_await with folly::Optional when it is available

[folly.git] / folly / Portability.h

diff --git a/folly/Portability.h b/folly/Portability.h
index 0f549868bdd0bb0ea4445bce692fbf8c56bbe669..87be0b29af71e4091979e709c0209a0f473a0f48 100644 (file)
--- a/folly/Portability.h
+++ b/folly/Portability.h
@@ -169,9 +169,9 @@ struct alignas(max_align_v) max_align_t {};
 #endif
 
 #if defined(__aarch64__)
-# define FOLLY_A64 1
+# define FOLLY_AARCH64 1
 #else
-# define FOLLY_A64 0
+# define FOLLY_AARCH64 0
 #endif
 
 #if defined (__powerpc64__)
@@ -182,7 +182,7 @@ struct alignas(max_align_v) max_align_t {};
 
 namespace folly {
 constexpr bool kIsArchAmd64 = FOLLY_X64 == 1;
-constexpr bool kIsArchAArch64 = FOLLY_A64 == 1;
+constexpr bool kIsArchAArch64 = FOLLY_AARCH64 == 1;
 constexpr bool kIsArchPPC64 = FOLLY_PPC64 == 1;
 }
 
@@ -407,3 +407,25 @@ constexpr auto kIsWindows = false;
 constexpr auto kMscVer = 0;
 #endif
 }
+
+// Define FOLLY_USE_CPP14_CONSTEXPR to be true if the compiler's C++14
+// constexpr support is "good enough".
+#ifndef FOLLY_USE_CPP14_CONSTEXPR
+#if defined(__clang__)
+#define FOLLY_USE_CPP14_CONSTEXPR __cplusplus >= 201300L
+#elif defined(__GNUC__)
+#define FOLLY_USE_CPP14_CONSTEXPR __cplusplus >= 201304L
+#else
+#define FOLLY_USE_CPP14_CONSTEXPR 0 // MSVC?
+#endif
+#endif
+
+#if FOLLY_USE_CPP14_CONSTEXPR
+#define FOLLY_CPP14_CONSTEXPR constexpr
+#else
+#define FOLLY_CPP14_CONSTEXPR inline
+#endif
+
+#if __cpp_coroutines >= 201703L || _MSC_VER
+#define FOLLY_HAS_COROUTINES 1
+#endif