CHANGELOG

v5.0.0 (breaking change!)

Types

• basic_result

  • {Result<T, E> => basic_result<mutability, T, E>}
  • Enabled lvalue reference types for both of T and E
  • result<T, E> the alias template for immutable basic_result
  • mut_result<T, E> the alias template for mutable basic_result

• success

  • {Ok<T> => success<T>}
  • Enabled lvalue reference types for T.

• failure

  • {Err<E> => failure<E>}
  • Enabled lvalue reference types for E.

New APIs

• as_ref()
• as_mut()
• indirect()
• indirect_ok()
• indirect_err()

v1.2.0

enhancement

• new API: transpose
• new API: map_or_else

v1.1.2

bug fix

• Result::and_then(O&& op) do not perticipate in overload resolution if unless op returns Result<U, E>.

std::invoke_result_t<O&&, T> must be returns Result<U, E>. It means op must only maps T -> U, never changes E.

• Result::or_else(O&& op) do not perticipate in overload resolution if unless op returns Result<T, F>.

std::invoke_result_t<O&&, E> must be returns Result<T, F>. It means op must only maps E -> F, never changes T.

v1.1.1

bug fix

• Result::unwrap_or_default() is now explicitly deleted if and only if std::is_default_constructible_v<T> || std::is_aggregate_v<T> is false.