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91 lines
3.3 KiB
C++
91 lines
3.3 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_PARAMETER_H
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#define SQLPP_PARAMETER_H
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#include <ostream>
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#include <sqlpp11/select_fwd.h>
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#include <sqlpp11/type_traits.h>
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namespace sqlpp
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{
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template<typename ValueType, typename NameType, typename TrivialValueIsNull>
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struct parameter_t: public ValueType::template operators<parameter_t<ValueType, NameType, TrivialValueIsNull>>
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{
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using _value_type = ValueType;
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using _is_parameter = std::true_type;
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using _is_expression_t = std::true_type;
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using _instance_t = typename NameType::_name_t::template _member_t<typename ValueType::_parameter_t>;
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using _trivial_value_is_null_t = TrivialValueIsNull;
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static_assert(std::is_same<_trivial_value_is_null_t, std::true_type>::value or std::is_same<_trivial_value_is_null_t, std::false_type>::value, "Invalid template parameter TrivialValueIsNull");
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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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constexpr bool _is_trivial() const
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{
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return false;
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}
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};
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template<typename Context, typename ValueType, typename NameType, typename TrivialValueIsNull>
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struct interpreter_t<Context, parameter_t<ValueType, NameType, TrivialValueIsNull>>
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{
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using T = parameter_t<ValueType, NameType, TrivialValueIsNull>;
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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, typename TrivialValueIsNull = trivial_value_is_null_t<typename std::decay<NamedExpr>::type>>
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auto parameter(NamedExpr&& namedExpr)
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-> parameter_t<typename std::decay<NamedExpr>::type::_value_type, typename std::decay<NamedExpr>::type, TrivialValueIsNull>
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{
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return {};
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}
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template<typename NamedExpr>
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auto where_parameter(NamedExpr&& namedExpr)
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-> parameter_t<typename std::decay<NamedExpr>::type::_value_type, typename std::decay<NamedExpr>::type, std::false_type>
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{
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return {};
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}
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}
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#endif
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