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feat: use detail::none_t instead of char

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Although the error value from combinators currently does not have any
information, it can have an information because it is a char value. It
is better to use no-information-type explicitly to make it clear that
it does not have any information. So I added none_t in toml::detai and
use it in combinators and parsers as an error value from combinators.
This commit is contained in:
ToruNiina
2019-05-31 17:07:52 +09:00
parent 81abb6c9d7
commit 717f5929c2
3 changed files with 46 additions and 25 deletions
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21
toml/result.hpp
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@@ -692,5 +692,26 @@ void swap(result<T, E>& lhs, result<T, E>& rhs)
// return lhs.is_ok() ? lhs : rhs;
// }
// ----------------------------------------------------------------------------
// re-use result<T, E> as a optional<T> with none_t
namespace detail
{
struct none_t {};
inline bool operator==(const none_t&, const none_t&) noexcept {return true;}
inline bool operator!=(const none_t&, const none_t&) noexcept {return false;}
inline bool operator< (const none_t&, const none_t&) noexcept {return false;}
inline bool operator<=(const none_t&, const none_t&) noexcept {return true;}
inline bool operator> (const none_t&, const none_t&) noexcept {return false;}
inline bool operator>=(const none_t&, const none_t&) noexcept {return true;}
template<typename charT, typename traitsT>
std::basic_ostream<charT, traitsT>&
operator<<(std::basic_ostream<charT, traitsT>& os, const none_t&)
{
os << "none";
return os;
}
inline failure<none_t> none() noexcept {return failure<none_t>{none_t{}};}
} // detail
} // toml11
#endif// TOML11_RESULT_H