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86 lines
3.0 KiB
C++
86 lines
3.0 KiB
C++
/*
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* Copyright (c) 2013-2014, 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_CONCAT_H
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#define SQLPP_CONCAT_H
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/interpret_tuple.h>
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#include <sqlpp11/basic_expression_operators.h>
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#include <sqlpp11/detail/logic.h>
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namespace sqlpp
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{
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// FIXME: Remove First, inherit from text_t
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template<typename First, typename... Args>
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struct concat_t: public value_type_of<First>::template expression_operators<concat_t<First, Args...>>,
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public alias_operators<concat_t<First, Args...>>
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{
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using _traits = make_traits<value_type_of<First>, ::sqlpp::tag::is_expression, ::sqlpp::tag::is_named_expression>;
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using _recursive_traits = make_recursive_traits<First, Args...>;
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static_assert(sizeof...(Args) > 0, "concat requires two arguments at least");
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static_assert(sqlpp::detail::all_t<is_text_t<First>::value, is_text_t<Args>::value...>::value, "at least one non-text argument detected in concat()");
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struct _name_t
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{
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static constexpr const char* _get_name() { return "CONCAT"; }
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template<typename T>
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struct _member_t
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{
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T concat;
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};
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};
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concat_t(First first, Args... args):
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_args(first, args...)
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{}
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concat_t(const concat_t&) = default;
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concat_t(concat_t&&) = default;
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concat_t& operator=(const concat_t&) = default;
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concat_t& operator=(concat_t&&) = default;
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~concat_t() = default;
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std::tuple<First, Args...> _args;
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};
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template<typename Context, typename First, typename... Args>
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struct serializer_t<Context, concat_t<First, Args...>>
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{
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using T = concat_t<First, Args...>;
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static Context& _(const T& t, Context& context)
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{
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context << "(";
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interpret_tuple(t._args, "||", context);
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context << ")";
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return context;
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}
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};
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}
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#endif
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