From 2e0d1ba48c38ddc0c22f6a023cad7b2c75a43466 Mon Sep 17 00:00:00 2001
From: "Stephan T. Lavavej" <stl@microsoft.com>
Date: Mon, 26 Feb 2024 13:22:20 -0800
Subject: [PATCH] Test only `__cpp_lib_byte`, drop `_HAS_STD_BYTE`. (#1145)

---
 include/gsl/byte | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/include/gsl/byte b/include/gsl/byte
index 7f30ae22..87d007ef 100644
--- a/include/gsl/byte
+++ b/include/gsl/byte
@@ -19,8 +19,6 @@
 
 #include <type_traits>
 
-// VS2017 15.8 added support for the __cpp_lib_byte definition
-// To do: drop _HAS_STD_BYTE when support for pre 15.8 expires
 #ifdef _MSC_VER
 
 #pragma warning(push)
@@ -31,18 +29,15 @@
 
 #ifndef GSL_USE_STD_BYTE
 // this tests if we are under MSVC and the standard lib has std::byte and it is enabled
-#if (defined(_HAS_STD_BYTE) && _HAS_STD_BYTE) ||                                                   \
-    (defined(__cpp_lib_byte) && __cpp_lib_byte >= 201603)
+#if defined(__cpp_lib_byte) && __cpp_lib_byte >= 201603
 
 #define GSL_USE_STD_BYTE 1
 
-#else // (defined(_HAS_STD_BYTE) && _HAS_STD_BYTE) || (defined(__cpp_lib_byte) && __cpp_lib_byte >=
-      // 201603)
+#else // defined(__cpp_lib_byte) && __cpp_lib_byte >= 201603
 
 #define GSL_USE_STD_BYTE 0
 
-#endif // (defined(_HAS_STD_BYTE) && _HAS_STD_BYTE) || (defined(__cpp_lib_byte) && __cpp_lib_byte >=
-       // 201603)
+#endif // defined(__cpp_lib_byte) && __cpp_lib_byte >= 201603
 #endif // GSL_USE_STD_BYTE
 
 #else // _MSC_VER