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82 lines
2.9 KiB
C++
82 lines
2.9 KiB
C++
/*
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* Copyright (c) 2013, 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_MULTI_COLUMN_H
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#define SQLPP_MULTI_COLUMN_H
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#include <sqlpp11/detail/make_expression_tuple.h>
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#include <sqlpp11/no_value.h>
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namespace sqlpp
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{
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template<typename AliasProvider, typename T>
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struct multi_column_t
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{
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static_assert(detail::wrong<T>::value, "invalid argument for multicolumn_t");
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};
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template<typename AliasProvider, typename... NamedExpr>
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struct multi_column_t<AliasProvider, std::tuple<NamedExpr...>>
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{
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using _named_expr_set = typename detail::make_set_if<is_named_expression_t, NamedExpr...>::type;
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static_assert(_named_expr_set::size::value == sizeof...(NamedExpr), "multi_column parameters need to be named expressions");
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using _name_t = typename AliasProvider::_name_t;
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template<typename T>
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using _member_t = typename AliasProvider::template _member_t<T>;
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struct _value_type: public no_value_t
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{
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using _is_named_expression = tag_yes;
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};
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using _is_multi_column = tag_yes;
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template<typename Db>
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void serialize(std::ostream& os, Db& db) const
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{
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detail::serialize_tuple(os, db, _columns, ',');
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}
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std::tuple<NamedExpr...> _columns;
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};
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namespace detail
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{
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template<typename AliasProvider, typename... Expr>
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using make_multi_column_t =
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multi_column_t<typename std::decay<AliasProvider>::type, decltype(make_expression_tuple(std::declval<Expr>()...))>;
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}
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template<typename AliasProvider, typename... NamedExpr>
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detail::make_multi_column_t<AliasProvider, NamedExpr...> multi_column(AliasProvider&& aliasProvider, NamedExpr&&... namedExpr)
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{
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return { {std::forward<NamedExpr>(namedExpr)...}};
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}
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}
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#endif
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