mirror of
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111 lines
3.1 KiB
C++
111 lines
3.1 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_SELECT_FLAGS_H
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#define SQLPP_SELECT_FLAGS_H
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#include <sqlpp11/select_fwd.h>
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/detail/set.h>
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#include <sqlpp11/detail/serialize_tuple.h>
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#include <tuple>
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#include <ostream>
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namespace sqlpp
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{
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// standard select flags
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struct all_t
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{
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struct _value_type
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{
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using _is_select_flag = tag_yes;
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};
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template<typename Db>
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void serialize(std::ostream& os, const Db&) const
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{
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os << "ALL";
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}
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};
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static constexpr all_t all = {};
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struct distinct_t
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{
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struct _value_type
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{
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using _is_select_flag = tag_yes;
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};
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template<typename Db>
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void serialize(std::ostream& os, const Db&) const
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{
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os << "DISTINCT";
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}
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};
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static constexpr distinct_t distinct = {};
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struct straight_join_t
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{
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struct _value_type
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{
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using _is_select_flag = tag_yes;
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};
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template<typename Db>
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void serialize(std::ostream& os, const Db&) const
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{
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os << "STRAIGHT_JOIN";
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}
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};
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static constexpr straight_join_t straight_join = {};
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// select_flag_list_t
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template<typename... Flag>
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struct select_flag_list_t<std::tuple<Flag...>>
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{
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// check for duplicate order expressions
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static_assert(not detail::has_duplicates<Flag...>::value, "at least one duplicate argument detected in select flag list");
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// check for invalid order expressions
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using _valid_flags = typename detail::make_set_if<is_select_flag_t, Flag...>::type;
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static_assert(_valid_flags::size::value == sizeof...(Flag), "at least one argument is not a select flag in select flag list");
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using _is_select_flag_list = 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, _flags, ' ');
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os << ' ';
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}
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std::tuple<Flag...> _flags;
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};
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}
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#endif
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