result

20.17.0

A generic result type for returning either a result or an error.

Deprecated. Use etl::expected

template <typename TValue, typename TError>

class result

Specialisation for void result.

template <typename TError>

class result<void, TError>

____________________________________________________________________________________________________

result() = delete;

Cannot be default constructed

result(const result& other)

Copy constructor

result(result&& other)

Move constructor

____________________________________________________________________________________________________

result(const TValue& value)

Construct from a value

Not valid for void specialisation

result(TValue&& value)

Move construct from a value

Not valid for void specialisation

____________________________________________________________________________________________________

result(const TError& err)

Construct from error

result(TError&& err)

Move construct from error

____________________________________________________________________________________________________

result& operator =(const result& other)

Copy assign

result& operator =(result&& other)

Move assign

____________________________________________________________________________________________________

result& operator =(const TValue& value)

Copy assign from value

Not valid for void specialisation

result& operator =(TValue&& value)

Move assign from value

Not valid for void specialisation

____________________________________________________________________________________________________

result& operator =(const TError& err)

Copy assign from error

result& operator =(TError&& err)

Move assign from error

____________________________________________________________________________________________________

bool is_value() const

true if result contains a value

____________________________________________________________________________________________________

bool is_error() const

true if result contains an error

____________________________________________________________________________________________________

const TValue& value() const

Returns a const reference to the value.

Undefined if the result does not contain an value.

Not valid for void specialisation

TValue&& value()

Returns an rvalue reference to the value.

Undefined if the result does not contain an value.

Not valid for void specialisation

____________________________________________________________________________________________________

const TError& error() const

Returns a const reference to the error.

Undefined if the result does not contain an error.

TError&& error()

Returns an rvalue reference to the error.

Undefined if the result does not contain an error.

result.h