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120 lines
4.5 KiB
C++
120 lines
4.5 KiB
C++
#pragma once
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/*
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* Copyright (c) 2013-2015, 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/alias.h>
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#include <sqlpp11/column_fwd.h>
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#include <sqlpp11/default_value.h>
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#include <sqlpp11/null.h>
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#include <sqlpp11/sort_order.h>
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/assignment.h>
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#include <sqlpp11/expression.h>
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#include <sqlpp11/wrong.h>
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#include <sqlpp11/detail/type_set.h>
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namespace sqlpp
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{
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template <typename Table, typename ColumnSpec>
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struct column_t : public expression_operators<column_t<Table, ColumnSpec>, value_type_of<ColumnSpec>>,
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public column_operators<column_t<Table, ColumnSpec>, value_type_of<ColumnSpec>>
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{
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struct _traits
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{
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using _value_type = value_type_of<ColumnSpec>;
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using _tags = detail::make_joined_set_t<detail::type_set<tag::is_column, tag::is_expression, tag::is_selectable>,
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typename ColumnSpec::_traits::_tags>;
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};
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using _nodes = detail::type_vector<>;
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using _required_tables = detail::type_set<Table>;
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using _can_be_null = column_spec_can_be_null_t<ColumnSpec>;
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using _spec_t = ColumnSpec;
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using _table = Table;
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using _alias_t = typename _spec_t::_alias_t;
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template <typename T>
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using _is_valid_assignment_operand = is_valid_assignment_operand<value_type_of<ColumnSpec>, T>;
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// disambiguation for C++20 / clang
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// (see https://bugs.llvm.org/show_bug.cgi?id=46508)
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using expression_operators<column_t<Table, ColumnSpec>, value_type_of<ColumnSpec>>::operator==;
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using expression_operators<column_t<Table, ColumnSpec>, value_type_of<ColumnSpec>>::operator!=;
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column_t() = default;
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column_t(const column_t&) = default;
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column_t(column_t&&) = default;
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column_t& operator=(const column_t&) = default;
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column_t& operator=(column_t&&) = default;
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~column_t() = default;
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template <typename T = _table>
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auto table() const -> _table
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{
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static_assert(is_table_t<T>::value, "cannot call get_table for columns of a sub-selects or cte");
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return _table{};
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}
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template <typename alias_provider>
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expression_alias_t<column_t, alias_provider> as(const alias_provider& /*unused*/) const
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{
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return {*this};
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}
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template <typename T>
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auto operator=(T t) const -> assignment_t<column_t, wrap_operand_t<T>>
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{
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using rhs = wrap_operand_t<T>;
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static_assert(_is_valid_assignment_operand<rhs>::value, "invalid rhs assignment operand");
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return {*this, {rhs{t}}};
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}
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auto operator=(null_t /*unused*/) const -> assignment_t<column_t, null_t>
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{
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static_assert(can_be_null_t<column_t>::value, "column cannot be null");
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return {*this, null_t{}};
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}
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auto operator=(default_value_t /*unused*/) const -> assignment_t<column_t, default_value_t>
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{
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return {*this, default_value_t{}};
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}
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};
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template <typename Context, typename Table, typename ColumnSpec>
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Context& serialize(const column_t<Table, ColumnSpec>&, Context& context)
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{
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using T = column_t<Table, ColumnSpec>;
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context << name_of<typename T::_table>::template char_ptr<Context>() << '.'
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<< name_of<T>::template char_ptr<Context>();
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return context;
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}
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} // namespace sqlpp
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