🏁 do not include <ciso646> unless old MSVC is used #2089

include/nlohmann/detail/boolean_operators.hpp

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <nlohmann/detail/macro_scope.hpp>
+
+// Header <ciso646> is needed for older MSVC versions to allow to use the
+// alternative operator representations "and", "or", and "not". As the header
+// is removed in C++20, we must only include it for old MSVC versions.
+// See <https://github.com/nlohmann/json/issues/2089> for more information.
+
+#if !JSON_HEDLEY_MSVC_VERSION_CHECK(15,5,0)
+    #include <ciso646> // and, not, or
+#endif