Baton - minimalist inter-thread notification

[folly.git] / folly / Range.h

diff --git a/folly/Range.h b/folly/Range.h
index 5466c6d6b8d611f067b0fd4bbcfa9f8b06a78763..1d3d0dd0dd3c7693af96749249f6abbfdd6d79b2 100644 (file)
--- a/folly/Range.h
+++ b/folly/Range.h
@@ -30,7 +30,18 @@
 #include <stdexcept>
 #include <type_traits>
 #include <boost/operators.hpp>
+
+// libc++ doesn't provide this header
+#if !FOLLY_USE_LIBCPP
+// This file appears in two locations: inside fbcode and in the
+// libstdc++ source code (when embedding fbstring as std::string).
+// To aid in this schizophrenic use, two macros are defined in
+// c++config.h:
+//   _LIBSTDCXX_FBSTRING - Set inside libstdc++.  This is useful to
+//      gate use inside fbcode v. libstdc++
 #include <bits/c++config.h>
+#endif
+
 #include "folly/CpuId.h"
 #include "folly/Traits.h"
 #include "folly/Likely.h"