utils::expected< S, E > Class Template Reference

#include <userver/utils/expected.hpp>

Detailed Description

template<class S, class E>
class utils::expected< S, E >

For holding a value or an error.

Definition at line 53 of file expected.hpp.

Public Member Functions
	expected (const S &success)
	expected (S &&success)
	expected (const unexpected< E > &error)
	expected (unexpected< E > &&error)
template<class G , typename = std::enable_if_t<std::is_convertible_v<G, E>>>
	expected (const unexpected< G > &error)
template<class G , typename = std::enable_if_t<std::is_convertible_v<G, E>>>
	expected (unexpected< G > &&error)
bool	has_value () const noexcept
	Check whether *this contains an expected value.
S &	value () &
	Return reference to the value or throws bad_expected_access if it's not available.
S	value () &&
	Extracts the value or throws bad_expected_access if it's not available.
const S &	value () const &
E &	error ()
	Return reference to the error value or throws bad_expected_access if it's not available.
const E &	error () const

Constructor & Destructor Documentation

expected() [1/6]

template<class S , class E >

utils::expected< S, E >::expected

(

const S &

success

)

Definition at line 119 of file expected.hpp.

expected() [2/6]

template<class S , class E >

utils::expected< S, E >::expected

(

S &&

success

)

Definition at line 122 of file expected.hpp.

expected() [3/6]

template<class S , class E >

utils::expected< S, E >::expected

(

const unexpected< E > &

error

)

Definition at line 125 of file expected.hpp.

expected() [4/6]

template<class S , class E >

utils::expected< S, E >::expected

(

unexpected< E > &&

error

)

Definition at line 128 of file expected.hpp.

expected() [5/6]

template<class S , class E >

template<class G , typename >

utils::expected< S, E >::expected

(

const unexpected< G > &

error

)

Definition at line 133 of file expected.hpp.

expected() [6/6]

template<class S , class E >

template<class G , typename >

utils::expected< S, E >::expected

(

unexpected< G > &&

error

)

Definition at line 138 of file expected.hpp.

Member Function Documentation

error() [1/2]

template<class S , class E >

E & utils::expected< S, E >::error

(

)

Return reference to the error value or throws bad_expected_access if it's not available.

Exceptions

utils::bad_expected_access

if success value is not available

Definition at line 172 of file expected.hpp.

error() [2/2]

template<class S , class E >

const E & utils::expected< S, E >::error

(

)

const

Definition at line 182 of file expected.hpp.

has_value()

template<class S , class E >

bool utils::expected< S, E >::has_value ( ) const

noexcept

Check whether *this contains an expected value.

Definition at line 142 of file expected.hpp.

value() [1/3]

template<class S , class E >

S & utils::expected< S, E >::value

(

)

&

Return reference to the value or throws bad_expected_access if it's not available.

Exceptions

utils::bad_expected_access

if *this contain an unexpected value

Definition at line 147 of file expected.hpp.

value() [2/3]

template<class S , class E >

S utils::expected< S, E >::value

(

)

&&

Extracts the value or throws bad_expected_access if it's not available.

Exceptions

utils::bad_expected_access

if *this contain an unexpected value

Definition at line 157 of file expected.hpp.

value() [3/3]

template<class S , class E >

const S & utils::expected< S, E >::value

(

)

const &

Definition at line 162 of file expected.hpp.

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The documentation for this class was generated from the following file:

• userver/utils/expected.hpp