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95 lines
2.8 KiB
C++
95 lines
2.8 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_ANY_H
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#define SQLPP_ANY_H
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#include <sstream>
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#include <sqlpp11/boolean.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 Select>
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struct any_t: public boolean::template operators<any_t<Select>>
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{
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static_assert(is_select_t<Select>::value, "any() requires a single column select expression as argument");
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static_assert(is_value_t<Select>::value, "any() requires a single column select expression as argument");
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struct _value_type: public Select::_value_type::_base_value_type
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{
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using _is_multi_expression = std::true_type; // must not be named
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};
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struct _name_t
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{
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static constexpr const char* _get_name() { return "ANY"; }
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template<typename T>
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struct _member_t
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{
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T any;
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};
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};
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any_t(Select&& select):
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_select(std::move(select))
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{}
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any_t(const Select& select):
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_select(select)
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{}
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any_t(const any_t&) = default;
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any_t(any_t&&) = default;
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any_t& operator=(const any_t&) = default;
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any_t& operator=(any_t&&) = default;
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~any_t() = default;
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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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static_assert(Db::_supports_any, "any() not supported by current database");
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os << "ANY(";
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_select.serialize(os, db);
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os << ")";
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}
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private:
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Select _select;
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};
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}
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template<typename T>
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auto any(T&& t) -> typename detail::any_t<typename operand_t<T, is_select_t>::type>
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{
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return { std::forward<T>(t) };
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}
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}
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#endif
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