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AK: Allow subclassing Error

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This commit is contained in:
Andreas Kling 2021-11-07 01:30:35 +01:00
parent b2170c11a4
commit e253cf694e
Notes: sideshowbarker 2024-07-18 01:24:05 +09:00
1 changed files with 13 additions and 11 deletions
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24
AK/Error.h
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@ -28,12 +28,13 @@ public:
int code() const { return m_code; } int code() const { return m_code; }
StringView string_literal() const { return m_string_literal; } StringView string_literal() const { return m_string_literal; }
private: protected:
Error(int code) Error(int code)
: m_code(code) : m_code(code)
{ {
} }
private:
Error(StringView string_literal) Error(StringView string_literal)
: m_string_literal(string_literal) : m_string_literal(string_literal)
{ {
@ -43,7 +44,7 @@ private:
StringView m_string_literal; StringView m_string_literal;
}; };
template<typename T> template<typename T, typename ErrorType = Error>
class [[nodiscard]] ErrorOr { class [[nodiscard]] ErrorOr {
public: public:
ErrorOr(T const& value) ErrorOr(T const& value)
@ -63,7 +64,7 @@ public:
} }
#endif #endif
ErrorOr(Error&& error) ErrorOr(ErrorType&& error)
: m_error(move(error)) : m_error(move(error))
{ {
} }
@ -78,20 +79,20 @@ public:
bool is_error() const { return m_error.has_value(); } bool is_error() const { return m_error.has_value(); }
T release_value() { return m_value.release_value(); } T release_value() { return m_value.release_value(); }
Error release_error() { return m_error.release_value(); } ErrorType release_error() { return m_error.release_value(); }
T release_value_but_fixme_should_propagate_errors() { return release_value(); } T release_value_but_fixme_should_propagate_errors() { return release_value(); }
private: private:
Optional<T> m_value; Optional<T> m_value;
Optional<Error> m_error; Optional<ErrorType> m_error;
}; };
// Partial specialization for void value type // Partial specialization for void value type
template<> template<typename ErrorType>
class [[nodiscard]] ErrorOr<void> { class [[nodiscard]] ErrorOr<void, ErrorType> {
public: public:
ErrorOr(Error error) ErrorOr(ErrorType error)
: m_error(move(error)) : m_error(move(error))
{ {
} }
@ -101,12 +102,13 @@ public:
ErrorOr(const ErrorOr& other) = default; ErrorOr(const ErrorOr& other) = default;
~ErrorOr() = default; ~ErrorOr() = default;
Error& error() { return m_error.value(); } ErrorType& error() { return m_error.value(); }
bool is_error() const { return m_error.has_value(); } bool is_error() const { return m_error.has_value(); }
Error release_error() { return m_error.release_value(); } ErrorType release_error() { return m_error.release_value(); }
void release_value() { }
private: private:
Optional<Error> m_error; Optional<ErrorType> m_error;
}; };
template<> template<>