add boost on mac

macx64/include/boost/histogram/ostream.hpp

@@ -0,0 +1,39 @@
+// Copyright 2015-2017 Hans Dembinski
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt
+// or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_HISTOGRAM_OSTREAM_HPP
+#define BOOST_HISTOGRAM_OSTREAM_HPP
+
+#include <boost/histogram/accumulators/ostream.hpp>
+#include <boost/histogram/axis/ostream.hpp>
+#include <boost/histogram/fwd.hpp>
+#include <iosfwd>
+
+#ifndef BOOST_HISTOGRAM_DOXYGEN_INVOKED
+
+namespace boost {
+namespace histogram {
+
+template <typename CharT, typename Traits, typename A, typename S>
+std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os,
+                                              const histogram<A, S>& h) {
+  os << "histogram(";
+  unsigned n = 0;
+  h.for_each_axis([&](const auto& a) {
+    if (h.rank() > 1) os << "\n  ";
+    os << a;
+    if (++n < h.rank()) os << ",";
+  });
+  os << (h.rank() > 1 ? "\n)" : ")");
+  return os;
+}
+
+} // namespace histogram
+} // namespace boost
+
+#endif // BOOST_HISTOGRAM_DOXYGEN_INVOKED
+
+#endif