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enable to assign value keeping region info

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ToruNiina
2018-12-13 17:07:26 +09:00
parent e5c29c2870
commit f60e93c36f
1 changed files with 32 additions and 0 deletions
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32
toml/value.hpp
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@@ -19,6 +19,8 @@ namespace detail
{
// to show error messages. not recommended for users.
region_base const& get_region(const value&);
// ditto.
void assign_keeping_region(value&, value);
}// detail
template<typename T>
@@ -558,6 +560,9 @@ class value
// for error messages
friend region_base const& detail::get_region(const value&);
// to see why it's here, see detail::insert_nested_key.
friend void detail::assign_keeping_region(value&, value);
template<value_t T>
struct switch_cast;
@@ -592,6 +597,33 @@ inline region_base const& get_region(const value& v)
{
return *(v.region_info_);
}
// If we keep region information after assigning another toml::* types, the
// error message become different from the actual value contained.
// To avoid this kind of confusing phenomena, the default assigners clear the
// old region_info_. But this functionality is actually needed deep inside of
// parser, so if you want to see the usecase, see toml::detail::insert_nested_key
// defined in toml/parser.hpp.
inline void assign_keeping_region(value& v, value other)
{
v.cleanup(); // this keeps region info
// keep region_info_ intact
v.type_ = other.type();
switch(v.type())
{
case value_t::Boolean : ::toml::value::assigner(v.boolean_ , other.boolean_ ); break;
case value_t::Integer : ::toml::value::assigner(v.integer_ , other.integer_ ); break;
case value_t::Float : ::toml::value::assigner(v.floating_ , other.floating_ ); break;
case value_t::String : ::toml::value::assigner(v.string_ , other.string_ ); break;
case value_t::OffsetDatetime: ::toml::value::assigner(v.offset_datetime_, other.offset_datetime_); break;
case value_t::LocalDatetime : ::toml::value::assigner(v.local_datetime_ , other.local_datetime_ ); break;
case value_t::LocalDate : ::toml::value::assigner(v.local_date_ , other.local_date_ ); break;
case value_t::LocalTime : ::toml::value::assigner(v.local_time_ , other.local_time_ ); break;
case value_t::Array : ::toml::value::assigner(v.array_ , other.array_ ); break;
case value_t::Table : ::toml::value::assigner(v.table_ , other.table_ ); break;
default: break;
}
return;
}
}// detail