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feat: add multi-argument toml::visit(visitor, ...)

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ToruNiina 2020-02-07 15:57:34 +09:00
parent c583e38ebf
commit b9f1726e26
1 changed files with 52 additions and 0 deletions
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52
toml/visit.hpp
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@ -78,5 +78,57 @@ visit(Visitor&& visitor, toml::basic_value<C, T, A>&& v)
"does not have any valid basic_value.", v, "here"));
}
namespace detail
{
template<typename Result, typename Visitor, typename Value>
struct visitor
{
template<typename ... Ts>
Result operator()(Ts&& ... args)
{
return vis(value, args ...);
}
Visitor vis;
Value value;
};
template<typename Result, typename Visitor, typename Value>
visitor<Result, Visitor, Value> make_visitor(Visitor&& vis, Value&& val)
{
return visitor<Result, Visitor, Value>{
std::forward<Visitor>(vis), std::forward<Value>(val)
};
}
} // detail
template<typename Visitor, typename Value, typename ... Values>
auto visit(Visitor&& visitor, Value&& v, Values&& ... vs)
-> detail::enable_if_t<detail::conjunction<
detail::is_basic_value<Value>, detail::is_basic_value<Values> ...
>::value, decltype(visitor(std::forward<Value >(v ).as_boolean(),
std::forward<Values>(vs).as_boolean()...))>
{
using result_t = decltype(visitor(v.as_boolean(), vs.as_boolean()...));
using detail::make_visitor;
switch(v.type())
{
case value_t::boolean : {return visit(make_visitor<result_t>(std::forward<Visitor>(visitor), v.as_boolean ()), std::forward<Values>(vs)...);}
case value_t::integer : {return visit(make_visitor<result_t>(std::forward<Visitor>(visitor), v.as_integer ()), std::forward<Values>(vs)...);}
case value_t::floating : {return visit(make_visitor<result_t>(std::forward<Visitor>(visitor), v.as_floating ()), std::forward<Values>(vs)...);}
case value_t::string : {return visit(make_visitor<result_t>(std::forward<Visitor>(visitor), v.as_string ()), std::forward<Values>(vs)...);}
case value_t::offset_datetime: {return visit(make_visitor<result_t>(std::forward<Visitor>(visitor), v.as_offset_datetime()), std::forward<Values>(vs)...);}
case value_t::local_datetime : {return visit(make_visitor<result_t>(std::forward<Visitor>(visitor), v.as_local_datetime ()), std::forward<Values>(vs)...);}
case value_t::local_date : {return visit(make_visitor<result_t>(std::forward<Visitor>(visitor), v.as_local_date ()), std::forward<Values>(vs)...);}
case value_t::local_time : {return visit(make_visitor<result_t>(std::forward<Visitor>(visitor), v.as_local_time ()), std::forward<Values>(vs)...);}
case value_t::array : {return visit(make_visitor<result_t>(std::forward<Visitor>(visitor), v.as_array ()), std::forward<Values>(vs)...);}
case value_t::table : {return visit(make_visitor<result_t>(std::forward<Visitor>(visitor), v.as_table ()), std::forward<Values>(vs)...);}
case value_t::empty : break;
default: break;
}
throw std::runtime_error(format_error("[error] toml::visit: toml::basic_value "
"does not have any valid basic_value.", v, "here"));
}
} // toml
#endif// TOML11_VISIT_HPP