Added thirdparty: boost library

thirdparty/include/boost/histogram/detail/make_default.hpp

@@ -0,0 +1,33 @@
+// Copyright 2015-2019 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_DETAIL_MAKE_DEFAULT_HPP
+#define BOOST_HISTOGRAM_DETAIL_MAKE_DEFAULT_HPP
+
+namespace boost {
+namespace histogram {
+namespace detail {
+
+template <class T>
+T make_default_impl(const T& t, decltype(t.get_allocator(), 0)) {
+  return T(t.get_allocator());
+}
+
+template <class T>
+T make_default_impl(const T&, float) {
+  return T{};
+}
+
+template <class T>
+T make_default(const T& t) {
+  return make_default_impl(t, 0);
+}
+
+} // namespace detail
+} // namespace histogram
+} // namespace boost
+
+#endif