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9c75c7b873
The code is much easier to read, the optimizer should take care of pretty much everything, AND it copiles even faster without the code being riddled with std::forward and std::decay
111 lines
3.5 KiB
C++
111 lines
3.5 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_LIST_H
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#define SQLPP_PARAMETER_LIST_H
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#include <sqlpp11/vendor/wrong.h>
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#include <tuple>
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namespace sqlpp
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{
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template<typename T>
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struct parameter_list_t
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{
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static_assert(vendor::wrong_t<T>::value, "Template parameter for parameter_list_t has to be a tuple");
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};
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template<typename... Parameter>
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struct parameter_list_t<std::tuple<Parameter...>>: public Parameter::_instance_t...
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{
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using _member_tuple_t = std::tuple<typename Parameter::_instance_t...>;
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using size = std::integral_constant<std::size_t, sizeof...(Parameter)>;
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parameter_list_t()
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{}
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template<typename Target>
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void _bind(Target& target) const
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{
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_bind_impl(target, index_t<0>());
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}
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private:
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template<size_t> struct index_t {}; // this is just for overloading
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template<typename Target, size_t index>
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void _bind_impl(Target& target, const index_t<index>&) const
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{
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const auto& parameter = static_cast<typename std::tuple_element<index, const _member_tuple_t>::type&>(*this)();
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parameter._bind(target, index);
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_bind_impl(target, index_t<index + 1>());
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}
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template<typename Target>
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void _bind_impl(Target& target, const index_t<size::value>&) const
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{
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}
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};
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namespace detail
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{
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template<typename Exp, typename Enable = void>
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struct get_parameter_tuple
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{
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using type = std::tuple<>;
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};
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template<typename Exp>
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struct get_parameter_tuple<Exp, typename std::enable_if<is_parameter_t<Exp>::value, void>::type>
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{
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using type = std::tuple<Exp>;
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};
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template<typename... Param>
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struct get_parameter_tuple<std::tuple<Param...>, void>
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{
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// cat together parameter tuples
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using type = decltype(std::tuple_cat(std::declval<typename get_parameter_tuple<Param>::type>()...));
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};
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template<typename Exp>
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struct get_parameter_tuple<Exp, typename std::enable_if<not std::is_same<typename Exp::_parameter_tuple_t, void>::value, void>::type>
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{
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using type = typename get_parameter_tuple<typename Exp::_parameter_tuple_t>::type;
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};
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}
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template<typename Exp>
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struct make_parameter_list_t
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{
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using type = parameter_list_t<typename detail::get_parameter_tuple<Exp>::type>;
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};
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}
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#endif
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