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91 lines
3.1 KiB
C++
91 lines
3.1 KiB
C++
/*
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* Copyright (c) 2013-2015, 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_PARAMETER_H
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#define SQLPP_PARAMETER_H
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/alias_provider.h>
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#include <sqlpp11/detail/type_set.h>
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namespace sqlpp
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{
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template<typename ValueType, typename NameType>
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struct parameter_t:
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public expression_operators<parameter_t<ValueType, NameType>, ValueType>
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{
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using _traits = make_traits<ValueType, tag::is_parameter, tag::is_expression>;
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using _nodes = detail::type_vector<>;
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using _parameters = std::tuple<parameter_t>;
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using _can_be_null = std::true_type;
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using _instance_t = member_t<NameType, parameter_value_t<ValueType>>;
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parameter_t()
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{}
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parameter_t(const parameter_t&) = default;
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parameter_t(parameter_t&&) = default;
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parameter_t& operator=(const parameter_t&) = default;
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parameter_t& operator=(parameter_t&&) = default;
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~parameter_t() = default;
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};
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template<typename Context, typename ValueType, typename NameType>
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struct serializer_t<Context, parameter_t<ValueType, NameType>>
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{
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using _serialize_check = consistent_t;
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using T = parameter_t<ValueType, NameType>;
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static Context& _(const T& t, Context& context)
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{
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context << "?";
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return context;
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}
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};
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template<typename NamedExpr>
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auto parameter(const NamedExpr&)
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-> parameter_t<value_type_of<NamedExpr>, NamedExpr>
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{
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static_assert(is_selectable_t<NamedExpr>::value, "not a named expression");
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return {};
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}
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template<typename ValueType, typename AliasProvider>
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auto parameter(const ValueType&, const AliasProvider&)
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-> parameter_t<wrap_operand_t<ValueType>, AliasProvider>
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{
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static_assert(is_value_type_t<ValueType>::value, "first argument is not a value type");
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static_assert(is_alias_provider_t<AliasProvider>::value, "second argument is not an alias provider");
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return {};
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}
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}
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#endif
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