text: /*
   * Copyright (c) 2013-2015, Roland Bock
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without modification,
   * are permitted provided that the following conditions are met:
   *
   *   Redistributions of source code must retain the above copyright notice, this
   *   list of conditions and the following disclaimer.
   *
   *   Redistributions in binary form must reproduce the above copyright notice, this
   *   list of conditions and the following disclaimer in the documentation and/or
   *   other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
   * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef SQLPP11_DATA_TYPES_PARAMETER_VALUE_BASE_H
  #define SQLPP11_DATA_TYPES_PARAMETER_VALUE_BASE_H
  
  #include <sqlpp11/data_types/parameter_value.h>
  #include <sqlpp11/tvin.h>
  
  namespace sqlpp
  {
    template <typename DataType, typename StorageType = typename DataType::_cpp_value_type>
    struct parameter_value_base
    {
      using _value_type = DataType;
      using _cpp_value_type = typename _value_type::_cpp_value_type;
      using _cpp_storage_type = StorageType;
  
      parameter_value_base() : _value{}, _is_null{true}
      {
      }
  
      explicit parameter_value_base(const _cpp_value_type& val) : _value(val), _is_null(false)
      {
      }
  
      parameter_value_base& operator=(const _cpp_value_type& val)
      {
        _value = val;
        _is_null = false;
        return *this;
      }
  
      parameter_value_base& operator=(const tvin_t<wrap_operand_t<_cpp_value_type>>& t)
      {
        if (t._is_trivial())
        {
          _value = {};
          _is_null = true;
        }
        else
        {
          _value = t._value._t;
          _is_null = false;
        }
        return *this;
      }
  
      void set_null()
      {
        _value = {};
        _is_null = true;
      }
  
      bool is_null() const
      {
        return _is_null;
      }
  
      const _cpp_value_type& value() const
      {
        return _value;
      }
  
      operator _cpp_value_type() const
      {
        return _value;
      }
  
    protected:
      _cpp_storage_type _value;
      bool _is_null;
    };
  }  // namespace sqlpp
  #endif
  