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+// file : butl/ft/exception -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#ifndef BUTL_FT_EXCEPTION
+#define BUTL_FT_EXCEPTION
+
+#include <cstddef> // _LIBCPP_VERSION
+#include <exception>
+
+// __cpp_lib_uncaught_exceptions
+//
+#ifndef __cpp_lib_uncaught_exceptions
+ //
+ // VC has it since 1900.
+ //
+# if defined(_MSC_VER)
+# if _MSC_VER >= 1900
+# define __cpp_lib_uncaught_exceptions 201411
+# endif
+ //
+ // Clang's libc++ seems to have it for a while (but not before 1200) so we
+ // assume it's there from 1200. But not for MacOS, where it is explicitly
+ // marked as unavailable until MacOS 10.12.
+ //
+# elif defined(_LIBCPP_VERSION)
+# if _LIBCPP_VERSION >= 1200 && \
+ (!defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) || \
+ __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 101200)
+# define __cpp_lib_uncaught_exceptions 201411
+# endif
+ //
+ // GCC libstdc++ has it since GCC 6 and it defines the feature test macro.
+ // We will also use this for any other runtime.
+ //
+# endif
+#endif
+
+#endif // BUTL_FT_EXCEPTION