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77 lines
3.1 KiB
C++
77 lines
3.1 KiB
C++
#pragma once
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/*
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* Copyright (c) 2021, 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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#include <sqlpp11/value_or_null.h>
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namespace sqlpp
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{
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template <typename Expr, typename ValueType>
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struct is_equal_to_or_null_t: public expression_operators<is_equal_to_or_null_t<Expr, ValueType>, boolean>,
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public alias_operators<is_equal_to_or_null_t<Expr, ValueType>>
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{
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using _traits = make_traits<boolean, tag::is_expression>;
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using _nodes = detail::type_vector<Expr, value_or_null_t<ValueType>>;
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is_equal_to_or_null_t(Expr expr, value_or_null_t<ValueType> value) : _expr(expr), _value(value)
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{
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}
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is_equal_to_or_null_t(const is_equal_to_or_null_t&) = default;
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is_equal_to_or_null_t(is_equal_to_or_null_t&&) = default;
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is_equal_to_or_null_t& operator=(const is_equal_to_or_null_t&) = default;
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is_equal_to_or_null_t& operator=(is_equal_to_or_null_t&&) = default;
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~is_equal_to_or_null_t() = default;
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Expr _expr;
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value_or_null_t<ValueType> _value;
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};
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template <typename Context, typename Expr, typename ValueType>
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Context& serialize(const is_equal_to_or_null_t<Expr, ValueType>& t, Context& context)
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{
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if (t._value._is_null)
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serialize(t._expr.is_null(), context);
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else
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serialize(t._expr == t._value, context);
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return context;
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}
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template <typename Expr, typename ValueType>
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auto is_equal_to_or_null(Expr expr, value_or_null_t<ValueType> value) -> is_equal_to_or_null_t<Expr, ValueType>
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{
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static_assert(is_expression_t<Expr>::value,
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"is_equal_to_or_null() is to be called an expression (e.g. a column) and a value_or_null expression");
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static_assert(std::is_same<value_type_of<Expr>, ValueType>::value,
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"is_equal_to_or_null() arguments need to have the same value type");
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return {expr, value};
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}
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} // namespace sqlpp
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