mirror of
https://github.com/rbock/sqlpp11.git
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299 lines
10 KiB
C++
299 lines
10 KiB
C++
/*
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* Copyright (c) 2013-2016, Roland Bock
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SQLPP_DETAIL_BASIC_EXPRESSION_OPERATORS_H
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#define SQLPP_DETAIL_BASIC_EXPRESSION_OPERATORS_H
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#include <sqlpp11/value_type_fwd.h>
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#include <sqlpp11/bad_expression.h>
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#include <sqlpp11/portable_static_assert.h>
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#include <sqlpp11/consistent.h>
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#include <sqlpp11/alias.h>
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#include <sqlpp11/sort_order.h>
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#include <sqlpp11/expression_fwd.h>
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#include <sqlpp11/in_fwd.h>
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#include <sqlpp11/is_null_fwd.h>
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#include <sqlpp11/wrap_operand.h>
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#include <sqlpp11/logic.h>
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namespace sqlpp
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{
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SQLPP_PORTABLE_STATIC_ASSERT(assert_comparison_rhs_is_expression_t, "rhs operand in comparison is not an expression");
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SQLPP_PORTABLE_STATIC_ASSERT(assert_comparison_rhs_is_valid_operand_t, "invalid rhs operand in comparison");
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SQLPP_PORTABLE_STATIC_ASSERT(assert_comparison_lhs_rhs_differ_t, "identical lhs and rhs operands in comparison");
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template <typename LhsType, typename RhsType>
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using check_comparison_impl = static_combined_check_t<
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static_check_t<logic::any_t<is_expression_t<RhsType>::value, is_multi_expression_t<RhsType>::value>::value,
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assert_comparison_rhs_is_expression_t>,
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static_check_t<value_type_of<LhsType>::template _is_valid_operand<RhsType>::value,
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assert_comparison_rhs_is_valid_operand_t>,
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static_check_t<not std::is_same<LhsType, RhsType>::value, assert_comparison_lhs_rhs_differ_t>>;
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template <typename LhsType, typename RhsType>
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using check_comparison_t = check_comparison_impl<LhsType, wrap_operand_t<RhsType>>;
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template <typename LhsType, typename... RhsType>
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using check_in_impl = static_combined_check_t<
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static_check_t<logic::all_t<is_expression_t<RhsType>::value...>::value, assert_comparison_rhs_is_expression_t>,
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static_check_t<logic::all_t<value_type_of<LhsType>::template _is_valid_operand<RhsType>::value...>::value,
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assert_comparison_rhs_is_valid_operand_t>,
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static_check_t<logic::none_t<std::is_same<LhsType, RhsType>::value...>::value,
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assert_comparison_lhs_rhs_differ_t>>;
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template <typename LhsType, typename... RhsType>
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using check_in_t = check_in_impl<LhsType, typename wrap_operand<RhsType>::type...>;
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namespace detail
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{
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template <bool Enable, template <typename Lhs, typename Rhs> class Expr, typename Lhs, typename Rhs>
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struct comparison_expression_impl
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{
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using type = bad_expression<boolean>;
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};
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template <template <typename Lhs, typename Rhs> class Expr, typename Lhs, typename Rhs>
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struct comparison_expression_impl<true, Expr, Lhs, Rhs>
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{
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using type = Expr<wrap_operand_t<Lhs>, wrap_operand_t<Rhs>>;
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};
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}
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template <template <typename Lhs, typename Rhs> class Expr, typename Lhs, typename Rhs>
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using comparison_expression_t =
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typename detail::comparison_expression_impl<check_comparison_t<Lhs, Rhs>::value, Expr, Lhs, Rhs>::type;
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namespace detail
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{
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template <bool Enable, template <typename Lhs, typename... Rhs> class Expr, typename Lhs, typename... Rhs>
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struct in_expression_impl
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{
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using type = bad_expression<boolean>;
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};
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template <template <typename Lhs, typename... Rhs> class Expr, typename Lhs, typename... Rhs>
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struct in_expression_impl<true, Expr, Lhs, Rhs...>
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{
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using type = Expr<Lhs, Rhs...>;
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};
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}
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template <typename Check, template <typename Lhs, typename... Rhs> class Expr, typename Lhs, typename... Rhs>
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using in_expression_t = typename detail::in_expression_impl<Check::value, Expr, Lhs, Rhs...>::type;
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// basic operators
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template <typename Expr>
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struct basic_expression_operators
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{
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template <template <typename Lhs, typename Rhs> class NewExpr, typename T>
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struct _new_binary_expression
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{
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using type = comparison_expression_t<NewExpr, Expr, T>;
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};
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template <template <typename Lhs, typename Rhs> class NewExpr, typename T>
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using _new_binary_expression_t = typename _new_binary_expression<NewExpr, T>::type;
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template <template <typename Lhs, typename... Rhs> class NewExpr, typename... T>
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struct _new_nary_expression
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{
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using _check = check_in_t<Expr, T...>;
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using type = in_expression_t<_check, NewExpr, Expr, wrap_operand_t<T>...>;
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};
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template <typename T>
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auto operator==(T t) const -> _new_binary_expression_t<equal_to_t, T>
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{
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using rhs = wrap_operand_t<T>;
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check_comparison_t<Expr, rhs>::_();
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return {*static_cast<const Expr*>(this), rhs{t}};
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}
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template <typename T>
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auto operator!=(T t) const -> _new_binary_expression_t<not_equal_to_t, T>
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{
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using rhs = wrap_operand_t<T>;
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check_comparison_t<Expr, rhs>::_();
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return {*static_cast<const Expr*>(this), rhs{t}};
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}
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template <typename T>
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auto operator<(T t) const -> _new_binary_expression_t<less_than_t, T>
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{
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using rhs = wrap_operand_t<T>;
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check_comparison_t<Expr, rhs>::_();
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return {*static_cast<const Expr*>(this), rhs{t}};
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}
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template <typename T>
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auto operator<=(T t) const -> _new_binary_expression_t<less_equal_t, T>
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{
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using rhs = wrap_operand_t<T>;
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check_comparison_t<Expr, rhs>::_();
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return {*static_cast<const Expr*>(this), rhs{t}};
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}
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template <typename T>
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auto operator>(T t) const -> _new_binary_expression_t<greater_than_t, T>
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{
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using rhs = wrap_operand_t<T>;
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check_comparison_t<Expr, rhs>::_();
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return {*static_cast<const Expr*>(this), rhs{t}};
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}
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template <typename T>
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auto operator>=(T t) const -> _new_binary_expression_t<greater_equal_t, T>
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{
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using rhs = wrap_operand_t<T>;
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check_comparison_t<Expr, rhs>::_();
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return {*static_cast<const Expr*>(this), rhs{t}};
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}
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auto is_null() const -> is_null_t<Expr>
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{
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return {*static_cast<const Expr*>(this)};
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}
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auto is_not_null() const -> is_not_null_t<Expr>
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{
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return {*static_cast<const Expr*>(this)};
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}
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auto asc() const -> sort_order_t<Expr, sort_type::asc>
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{
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return {*static_cast<const Expr*>(this)};
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}
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auto desc() const -> sort_order_t<Expr, sort_type::desc>
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{
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return {*static_cast<const Expr*>(this)};
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}
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template <typename... T>
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auto in(T... t) const -> typename _new_nary_expression<in_t, T...>::type
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{
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check_in_t<Expr, wrap_operand_t<T>...>::_();
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return {*static_cast<const Expr*>(this), typename wrap_operand<T>::type{t}...};
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}
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template <typename... T>
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auto not_in(T... t) const -> typename _new_nary_expression<not_in_t, T...>::type
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{
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check_in_t<Expr, wrap_operand_t<T>...>::_();
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return {*static_cast<const Expr*>(this), typename wrap_operand<T>::type{t}...};
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}
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template <typename Defer = void>
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auto operator not() const -> return_type_not_t<Expr, Defer>
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{
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return_type_not<Expr, Defer>::check::_();
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return {*static_cast<const Expr*>(this)};
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}
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template <typename R>
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auto operator and(const R& r) const -> return_type_and_t<Expr, R>
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{
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return_type_and<Expr, R>::check::_();
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return {*static_cast<const Expr*>(this), wrap_operand_t<R>{r}};
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}
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template <typename R>
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auto operator&(const R& r) const -> return_type_bitwise_and_t<Expr, R>
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{
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return_type_bitwise_and<Expr, R>::check::_();
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return {*static_cast<const Expr*>(this), wrap_operand_t<R>{r}};
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}
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template <typename R>
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auto operator|(const R& r) const -> return_type_bitwise_or_t<Expr, R>
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{
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return_type_bitwise_or<Expr, R>::check::_();
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return {*static_cast<const Expr*>(this), wrap_operand_t<R>{r}};
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}
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template <typename R>
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auto operator or(const R& r) const -> return_type_or_t<Expr, R>
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{
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return_type_or<Expr, R>::check::_();
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return {*static_cast<const Expr*>(this), wrap_operand_t<R>{r}};
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}
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template <typename R>
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auto operator+(const R& r) const -> return_type_plus_t<Expr, R>
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{
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return_type_plus<Expr, R>::check::_();
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return {*static_cast<const Expr*>(this), wrap_operand_t<R>{r}};
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}
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template <typename R>
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auto operator-(const R& r) const -> return_type_minus_t<Expr, R>
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{
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return_type_minus<Expr, R>::check::_();
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return {*static_cast<const Expr*>(this), wrap_operand_t<R>{r}};
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}
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template <typename R>
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auto operator*(const R& r) const -> return_type_multiplies_t<Expr, R>
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{
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return_type_multiplies<Expr, R>::check::_();
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return {*static_cast<const Expr*>(this), wrap_operand_t<R>{r}};
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}
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template <typename R>
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auto operator/(const R& r) const -> return_type_divides_t<Expr, R>
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{
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return_type_divides<Expr, R>::check::_();
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return {*static_cast<const Expr*>(this), wrap_operand_t<R>{r}};
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}
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template <typename R>
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auto operator%(const R& r) const -> return_type_modulus_t<Expr, R>
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{
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return_type_modulus<Expr, R>::check::_();
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return {*static_cast<const Expr*>(this), wrap_operand_t<R>{r}};
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}
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template <typename Defer = void>
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auto operator+() const -> return_type_unary_plus_t<Expr, Defer>
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{
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return_type_unary_plus<Expr, Defer>::check::_();
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return {*static_cast<const Expr*>(this)};
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}
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template <typename Defer = void>
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auto operator-() const -> return_type_unary_minus_t<Expr, Defer>
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{
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return_type_unary_minus<Expr, Defer>::check::_();
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return {*static_cast<const Expr*>(this)};
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}
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};
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}
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#endif
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