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72 lines
1.8 KiB
C++
72 lines
1.8 KiB
C++
// Copyright Toru Niina 2017.
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// Distributed under the MIT License.
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#ifndef TOML11_FROM_TOML_HPP
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#define TOML11_FROM_TOML_HPP
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#include "get.hpp"
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namespace toml
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{
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template<typename T>
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void from_toml(T& x, const toml::value& v)
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{
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x = toml::get<typename std::remove_reference<T>::type>(v);
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return;
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}
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namespace detail
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{
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template<typename T>
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constexpr toml::value_t determine_castable_type()
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{
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return check_type<T>() != toml::value_t::Unknown ? check_type<T>() :
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toml::detail::is_map<T>::value ? toml::value_t::Table :
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toml::detail::is_container<T>::value ? toml::value_t::Array :
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toml::value_t::Unknown;
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}
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template<std::size_t N, typename ... Ts>
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struct from_toml_tie_impl
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{
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constexpr static std::size_t index = sizeof...(Ts) - N;
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constexpr static toml::value_t type_index =
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determine_castable_type<
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typename std::tuple_element<index, std::tuple<Ts...>>::type>();
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static void invoke(std::tuple<Ts& ...> tie, const toml::value& v)
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{
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// static_cast is needed because with intel c++ compiler, operator==
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// is only defined when the two types are strictly equal, and type_index
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// is const toml::value_t, while v.type() is toml::value_t.
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if(static_cast<toml::value_t>(type_index) == v.type())
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{
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from_toml(std::get<index>(tie), v);
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return;
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}
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return from_toml_tie_impl<N-1, Ts...>::invoke(tie, v);
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}
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};
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template<typename ... Ts>
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struct from_toml_tie_impl<0, Ts...>
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{
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static void invoke(std::tuple<Ts& ...>, const toml::value&)
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{
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return;
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}
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};
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} // detail
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template<typename ... Ts>
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void from_toml(std::tuple<Ts& ...> tie, const toml::value& v)
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{
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detail::from_toml_tie_impl<sizeof...(Ts), Ts...>::invoke(tie, v);
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return;
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}
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} // toml
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#endif // TOML11_FROM_TOML
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