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67 lines
2.6 KiB
C++
67 lines
2.6 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_DETAIL_MAKE_EXPRESSION_TUPLE_H
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#define SQLPP_DETAIL_MAKE_EXPRESSION_TUPLE_H
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namespace sqlpp
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{
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namespace detail
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{
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template<typename Expr>
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auto make_single_expression_tuple(Expr&& expr) -> typename std::enable_if<is_named_expression_t<typename std::decay<Expr>::type>::value, decltype(std::make_tuple(expr))>::type
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{
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return std::make_tuple(std::forward<Expr>(expr));
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};
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template<typename Expr>
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auto make_single_expression_tuple(Expr&& expr) -> typename std::enable_if<is_select_flag_t<typename std::decay<Expr>::type>::value, std::tuple<>>::type
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{
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return {};
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};
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template<typename Tab>
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auto make_single_expression_tuple(Tab&& tab) -> typename std::enable_if<is_table_t<typename std::decay<Tab>::type>::value, typename std::decay<Tab>::type::_all_of_t>::type
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{
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return {};
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};
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template<typename... Expr>
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auto make_single_expression_tuple(std::tuple<Expr...>&& t) -> std::tuple<Expr...>
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{
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return t;
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};
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template<typename... Expr>
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auto make_expression_tuple(Expr&&... expr) -> decltype(std::tuple_cat(make_single_expression_tuple(std::forward<Expr>(expr))...))
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{
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return std::tuple_cat(make_single_expression_tuple(std::forward<Expr>(expr))...);
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};
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}
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}
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#endif
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