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80 lines
3.1 KiB
C++
80 lines
3.1 KiB
C++
/*
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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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#ifndef SQLPP_FIELD_SPEC_H
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#define SQLPP_FIELD_SPEC_H
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#include <sqlpp11/multi_column.h>
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namespace sqlpp
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{
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template <typename NameType, typename ValueType, bool CanBeNull, bool NullIsTrivialValue>
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struct field_spec_t
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{
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using _traits = make_traits<ValueType,
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tag::is_noop,
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tag_if<tag::can_be_null, CanBeNull>,
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tag_if<tag::null_is_trivial_value, NullIsTrivialValue>>;
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using _nodes = detail::type_vector<>;
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using _alias_t = NameType;
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};
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template <typename AliasProvider, typename FieldSpecTuple>
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struct multi_field_spec_t
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{
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};
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namespace detail
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{
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template <typename Select, typename NamedExpr>
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struct make_field_spec_impl
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{
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static constexpr bool _can_be_null = can_be_null_t<NamedExpr>::value;
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static constexpr bool _depends_on_outer_table =
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detail::make_intersect_set_t<required_tables_of<NamedExpr>,
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typename Select::_used_outer_tables>::size::value > 0;
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using type = field_spec_t<typename NamedExpr::_alias_t,
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value_type_of<NamedExpr>,
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logic::any_t<_can_be_null, _depends_on_outer_table>::value,
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null_is_trivial_value_t<NamedExpr>::value>;
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};
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template <typename Select, typename AliasProvider, typename... NamedExprs>
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struct make_field_spec_impl<Select, multi_column_alias_t<AliasProvider, NamedExprs...>>
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{
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using type =
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multi_field_spec_t<AliasProvider, std::tuple<typename make_field_spec_impl<Select, NamedExprs>::type...>>;
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};
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}
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template <typename Select, typename NamedExpr>
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using make_field_spec_t = typename detail::make_field_spec_impl<Select, NamedExpr>::type;
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}
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#endif
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