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 * 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_EXPRESSION_FWD_H
#define SQLPP11_EXPRESSION_FWD_H
namespace sqlpp
  struct boolean;
  struct integral;
  struct floating_point;
  struct noop;
  namespace op
    struct less
      using _traits = make_traits<boolean>;
      static constexpr const char* _name = "<";
    struct less_equal
      using _traits = make_traits<boolean>;
      static constexpr const char* _name = "<=";
    struct equal_to
      using _traits = make_traits<boolean>;
    struct not_equal_to
      using _traits = make_traits<boolean>;
    struct greater_equal
      using _traits = make_traits<boolean>;
      static constexpr const char* _name = ">=";
    struct greater
      using _traits = make_traits<boolean>;
      static constexpr const char* _name = ">";
    struct logical_or
      using _traits = make_traits<boolean>;
      static constexpr const char* _name = " OR ";
    struct logical_and
      using _traits = make_traits<boolean>;
      static constexpr const char* _name = " AND ";
    struct logical_not
      using _traits = make_traits<boolean>;
    template <typename ValueType>
    struct plus
      using _traits = make_traits<ValueType>;
      static constexpr const char* _name = "+";
    template <typename ValueType>
    struct minus
      using _traits = make_traits<ValueType>;
      // The trailing space is necessary to prevent
      // ```
      // t.id - -1
      // ```
      // from turning into
      // ```
      // tab_sample.id--1
      // ```
      // (-- starts a comment in SQL)
      // See https://github.com/rbock/sqlpp11/issues/294
      static constexpr const char* _name = " - ";
    template <typename ValueType>
    struct multiplies
      using _traits = make_traits<ValueType>;
      static constexpr const char* _name = "*";
    struct divides
      using _traits = make_traits<floating_point>;
      static constexpr const char* _name = "/";
    struct modulus
      using _traits = make_traits<integral>;
      static constexpr const char* _name = "%";
    template <typename ValueType>
    struct unary_minus
      using _traits = make_traits<ValueType>;
      static constexpr const char* _name = "-";
    template <typename ValueType>
    struct unary_plus
      using _traits = make_traits<ValueType>;
      static constexpr const char* _name = "+";
    template <typename ValueType>
    struct bitwise_and
      using _traits = make_traits<ValueType>;
      static constexpr const char* _name = "&";
    template <typename ValueType>
    struct bitwise_or
      using _traits = make_traits<ValueType>;
      static constexpr const char* _name = "|";
    template <typename ValueType>
    struct shift_left
      using _traits = make_traits<ValueType>;
      static constexpr const char* _name = "<<";
    template <typename ValueType>
    struct shift_right
      using _traits = make_traits<ValueType>;
      static constexpr const char* _name = ">>";
  }  // namespace op
  template <typename Lhs, typename O, typename Rhs>
  struct binary_expression_t;
  template <typename O, typename Rhs>
  struct unary_expression_t;
  template <typename Lhs, typename Rhs>
  using less_than_t = binary_expression_t<Lhs, op::less, Rhs>;
  template <typename Lhs, typename Rhs>
  using less_equal_t = binary_expression_t<Lhs, op::less_equal, Rhs>;
  template <typename Lhs, typename Rhs>
  using equal_to_t = binary_expression_t<Lhs, op::equal_to, Rhs>;
  template <typename Lhs, typename Rhs>
  using not_equal_to_t = binary_expression_t<Lhs, op::not_equal_to, Rhs>;
  template <typename Lhs, typename Rhs>
  using greater_than_t = binary_expression_t<Lhs, op::greater, Rhs>;
  template <typename Lhs, typename Rhs>
  using greater_equal_t = binary_expression_t<Lhs, op::greater_equal, Rhs>;
  template <typename Lhs, typename Rhs>
  using logical_and_t = binary_expression_t<Lhs, op::logical_and, Rhs>;
  template <typename Lhs, typename Rhs>
  using logical_or_t = binary_expression_t<Lhs, op::logical_or, Rhs>;
  template <typename Lhs, typename ValueType, typename Rhs>
  using plus_t = binary_expression_t<Lhs, op::plus<ValueType>, Rhs>;
  template <typename Lhs, typename ValueType, typename Rhs>
  using minus_t = binary_expression_t<Lhs, op::minus<ValueType>, Rhs>;
  template <typename Lhs, typename ValueType, typename Rhs>
  using multiplies_t = binary_expression_t<Lhs, op::multiplies<ValueType>, Rhs>;
  template <typename Lhs, typename Rhs>
  using divides_t = binary_expression_t<Lhs, op::divides, Rhs>;
  template <typename Lhs, typename Rhs>
  using modulus_t = binary_expression_t<Lhs, op::modulus, Rhs>;
  template <typename Rhs>
  using logical_not_t = unary_expression_t<op::logical_not, Rhs>;
  template <typename ValueType, typename Rhs>
  using unary_plus_t = unary_expression_t<op::unary_plus<ValueType>, Rhs>;
  template <typename ValueType, typename Rhs>
  using unary_minus_t = unary_expression_t<op::unary_minus<ValueType>, Rhs>;
  template <typename Lhs, typename ValueType, typename Rhs>
  using bitwise_and_t = binary_expression_t<Lhs, op::bitwise_and<ValueType>, Rhs>;
  template <typename Lhs, typename ValueType, typename Rhs>
  using bitwise_or_t = binary_expression_t<Lhs, op::bitwise_or<ValueType>, Rhs>;
  template <typename Lhs, typename ValueType, typename Rhs>
  using shift_left_t = binary_expression_t<Lhs, op::shift_left<ValueType>, Rhs>;
  template <typename Lhs, typename ValueType, typename Rhs>
  using shift_right_t = binary_expression_t<Lhs, op::shift_right<ValueType>, Rhs>;
  namespace detail
    template <typename Expr, typename Enable = void>
    struct lhs_impl
      using type = noop;
    template <typename Expr>
    struct lhs_impl<Expr, typename std::enable_if<std::is_class<typename Expr::_lhs_t>::value>::type>
      using type = typename Expr::_lhs_t;
    template <typename Expr, typename Enable = void>
    struct rhs_impl
      using type = noop;
    template <typename Expr>
    struct rhs_impl<Expr, typename std::enable_if<std::is_class<typename Expr::_rhs_t>::value>::type>
      using type = typename Expr::_rhs_t;
  }  // namespace detail
  // workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2086629
  template <typename Expr>
  using lhs = detail::lhs_impl<Expr>;
  template <typename Expr>
  using lhs_t = typename detail::lhs_impl<Expr>::type;
  // workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2086629
  template <typename Expr>
  using rhs = detail::rhs_impl<Expr>;
  template <typename Expr>
  using rhs_t = typename detail::rhs_impl<Expr>::type;
}  // namespace sqlpp
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