text: /// @copyright
  /// Copyright (C) 2020 Assured Information Security, Inc.
  ///
  /// @copyright
  /// Permission is hereby granted, free of charge, to any person obtaining a copy
  /// of this software and associated documentation files (the "Software"), to deal
  /// in the Software without restriction, including without limitation the rights
  /// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  /// copies of the Software, and to permit persons to whom the Software is
  /// furnished to do so, subject to the following conditions:
  ///
  /// @copyright
  /// The above copyright notice and this permission notice shall be included in
  /// all copies or substantial portions of the Software.
  ///
  /// @copyright
  /// 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 AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  /// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  /// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  /// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  /// SOFTWARE.
  ///
  /// @file nonesuch.hpp
  ///
  
  #ifndef BSL_NONESUCH_HPP
  #define BSL_NONESUCH_HPP
  
  namespace bsl
  {
      /// @class bsl::nonesuch
      ///
      /// <!-- description -->
      ///   @brief Used by is_detected to indicate detection failure.
      ///
      class nonesuch final
      {
      public:
          /// <!-- description -->
          ///   @brief Used to define bsl::nonesuch as useless
          ///
          constexpr nonesuch() noexcept = delete;
  
          /// <!-- description -->
          ///   @brief Used to define bsl::nonesuch as useless
          ///
          ~nonesuch() noexcept = delete;
  
          /// <!-- description -->
          ///   @brief Used to define bsl::nonesuch as useless
          ///
          /// <!-- inputs/outputs -->
          ///   @param o the object being copied
          ///
          constexpr nonesuch(nonesuch const &o) noexcept = delete;
  
          /// <!-- description -->
          ///   @brief Used to define bsl::nonesuch as useless
          ///
          /// <!-- inputs/outputs -->
          ///   @param o the object being moved
          ///
          constexpr nonesuch(nonesuch &&o) noexcept = delete;
  
          /// <!-- description -->
          ///   @brief Used to define bsl::nonesuch as useless
          ///
          /// <!-- inputs/outputs -->
          ///   @param o the object being copied
          ///   @return a reference to *this
          ///
          constexpr nonesuch &operator=(nonesuch const &o) &noexcept = delete;
  
          /// <!-- description -->
          ///   @brief Used to define bsl::nonesuch as useless
          ///
          /// <!-- inputs/outputs -->
          ///   @param o the object being moved
          ///   @return a reference to *this
          ///
          constexpr nonesuch &operator=(nonesuch &&o) &noexcept = delete;
      };
  }
  
  #endif
  