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AK: Add a Optional::value_or_lazy_evaluated(constructor_function) API

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This allows the user to avoid constructing the default value if the
optional already contains a value.
This is used by the Jakt runtime.
This commit is contained in:
Ali Mohammad Pur 2022-12-09 20:14:06 +03:30 committed by Ali Mohammad Pur
parent cc948d06a6
commit 21c2d8bd98
1 changed files with 64 additions and 0 deletions
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64
AK/Optional.h
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@ -227,6 +227,38 @@ public:
return move(fallback);
}
template<typename Callback>
[[nodiscard]] ALWAYS_INLINE T value_or_lazy_evaluated(Callback callback) const
{
if (m_has_value)
return value();
return callback();
}
template<typename Callback>
[[nodiscard]] ALWAYS_INLINE Optional<T> value_or_lazy_evaluated_optional(Callback callback) const
{
if (m_has_value)
return value();
return callback();
}
template<typename Callback>
[[nodiscard]] ALWAYS_INLINE ErrorOr<T> try_value_or_lazy_evaluated(Callback callback) const
{
if (m_has_value)
return value();
return TRY(callback());
}
template<typename Callback>
[[nodiscard]] ALWAYS_INLINE ErrorOr<Optional<T>> try_value_or_lazy_evaluated_optional(Callback callback) const
{
if (m_has_value)
return value();
return TRY(callback());
}
ALWAYS_INLINE T const& operator*() const { return value(); }
ALWAYS_INLINE T& operator*() { return value(); }
@ -424,6 +456,38 @@ public:
return {};
}
template<typename Callback>
[[nodiscard]] ALWAYS_INLINE T value_or_lazy_evaluated(Callback callback) const
{
if (m_pointer != nullptr)
return value();
return callback();
}
template<typename Callback>
[[nodiscard]] ALWAYS_INLINE Optional<T> value_or_lazy_evaluated_optional(Callback callback) const
{
if (m_pointer != nullptr)
return value();
return callback();
}
template<typename Callback>
[[nodiscard]] ALWAYS_INLINE ErrorOr<T> try_value_or_lazy_evaluated(Callback callback) const
{
if (m_pointer != nullptr)
return value();
return TRY(callback());
}
template<typename Callback>
[[nodiscard]] ALWAYS_INLINE ErrorOr<Optional<T>> try_value_or_lazy_evaluated_optional(Callback callback) const
{
if (m_pointer != nullptr)
return value();
return TRY(callback());
}
template<typename F, typename MappedType = decltype(declval<F>()(declval<T&>())), auto IsErrorOr = IsSpecializationOf<MappedType, ErrorOr>, typename OptionalType = Optional<ConditionallyResultType<IsErrorOr, MappedType>>>
ALWAYS_INLINE Conditional<IsErrorOr, ErrorOr<OptionalType>, OptionalType> map(F&& mapper)
{