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+// Copyright 2018 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_UNSAFE_ACCESS_HPP
+#define BOOST_HISTOGRAM_UNSAFE_ACCESS_HPP
+
+#include <boost/histogram/detail/axes.hpp>
+#include <type_traits>
+
+namespace boost {
+namespace histogram {
+
+/// Unsafe read/write access to classes that potentially break consistency
+struct unsafe_access {
+  /**
+    Get axes.
+    @param hist histogram.
+  */
+  template <class Histogram>
+  static auto& axes(Histogram& hist) {
+    return hist.axes_;
+  }
+
+  /// @copydoc axes()
+  template <class Histogram>
+  static const auto& axes(const Histogram& hist) {
+    return hist.axes_;
+  }
+
+  /**
+    Get mutable axis reference with compile-time number.
+    @param hist histogram.
+    @tparam I axis index (optional, default: 0).
+  */
+  template <class Histogram, unsigned I = 0>
+  static decltype(auto) axis(Histogram& hist, std::integral_constant<unsigned, I> = {}) {
+    detail::axis_index_is_valid(hist.axes_, I);
+    return detail::axis_get<I>(hist.axes_);
+  }
+
+  /**
+    Get mutable axis reference with run-time number.
+    @param hist histogram.
+    @param i axis index.
+  */
+  template <class Histogram>
+  static decltype(auto) axis(Histogram& hist, unsigned i) {
+    detail::axis_index_is_valid(hist.axes_, i);
+    return detail::axis_get(hist.axes_, i);
+  }
+
+  /**
+    Get storage.
+    @param hist histogram.
+  */
+  template <class Histogram>
+  static auto& storage(Histogram& hist) {
+    return hist.storage_;
+  }
+
+  /// @copydoc storage()
+  template <class Histogram>
+  static const auto& storage(const Histogram& hist) {
+    return hist.storage_;
+  }
+};
+
+} // namespace histogram
+} // namespace boost
+
+#endif