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+/* Traits for Outcome
+(C) 2018-2019 Niall Douglas <http://www.nedproductions.biz/> (59 commits)
+File Created: March 2018
+
+
+Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef BOOST_OUTCOME_TRAIT_STD_EXCEPTION_HPP
+#define BOOST_OUTCOME_TRAIT_STD_EXCEPTION_HPP
+
+#include "../config.hpp"
+
+#include <exception>
+
+BOOST_OUTCOME_V2_NAMESPACE_BEGIN
+
+namespace policy
+{
+  namespace detail
+  {
+    /* Pass through `make_exception_ptr` function for `std::exception_ptr`.
+    */
+    inline std::exception_ptr make_exception_ptr(std::exception_ptr v) { return v; }
+
+    // Try ADL, if not use fall backs above
+    template <class T> constexpr inline decltype(auto) exception_ptr(T &&v) { return make_exception_ptr(std::forward<T>(v)); }
+  }  // namespace detail
+
+  /*! AWAITING HUGO JSON CONVERSION TOOL 
+SIGNATURE NOT RECOGNISED
+*/
+  template <class T> constexpr inline decltype(auto) exception_ptr(T &&v) { return detail::exception_ptr(std::forward<T>(v)); }
+
+  namespace detail
+  {
+    template <bool has_error_payload> struct _rethrow_exception
+    {
+      template <class Exception> explicit _rethrow_exception(Exception && /*unused*/)  // NOLINT
+      {
+      }
+    };
+    template <> struct _rethrow_exception<true>
+    {
+      template <class Exception> explicit _rethrow_exception(Exception &&excpt)  // NOLINT
+      {
+        // ADL
+        rethrow_exception(policy::exception_ptr(std::forward<Exception>(excpt)));
+      }
+    };
+  }  // namespace detail
+}  // namespace policy
+
+namespace trait
+{
+  namespace detail
+  {
+    // Shortcut this for lower build impact
+    template <> struct _is_exception_ptr_available<std::exception_ptr>
+    {
+      static constexpr bool value = true;
+    };
+  }  // namespace detail
+
+  // std::exception_ptr is an error type
+  template <> struct is_error_type<std::exception_ptr>
+  {
+    static constexpr bool value = true;
+  };
+
+}  // namespace trait
+
+BOOST_OUTCOME_V2_NAMESPACE_END
+
+#endif