stdx::expected< T, E > Class Template Reference

#include <expected.h>

Public Types
using	value_type = T
using	error_type = E
using	unexpected_type = unexpected< E >
template<typename U >
using	rebind = expected< U, error_type >

Public Member Functions
constexpr	expected () noexcept(std::is_nothrow_default_constructible_v< T >)
constexpr	expected (const expected &other)=default
constexpr	expected (const expected &other) noexcept((std::is_nothrow_copy_constructible_v< T > &&std::is_nothrow_copy_constructible_v< E >))
constexpr	expected (expected &&other)=default
constexpr	expected (expected &&other) noexcept((std::is_nothrow_move_constructible_v< E > &&std::is_nothrow_move_constructible_v< T >))
template<class U , class G , class UF = std::add_lvalue_reference_t<const U>, class GF = const G &>
constexpr	explicit (constructor_is_explicit< UF, GF >) expected(const expected< U
template<class U , class G , class UF = U, class GF = G>
constexpr	explicit (constructor_is_explicit< UF, GF >) expected(expected< U
template<class U = T> requires can_construct_from_value_type<U>
constexpr	explicit (!std::is_convertible_v< U, T >) expected(U &&val)
template<class G > requires std::is_constructible_v<E, const G &>
constexpr	explicit (!std::is_convertible_v< const G &, E >) expected(const unexpected< G > &err)
template<class G > requires std::is_constructible_v<E, G>
constexpr	explicit (!std::is_convertible_v< G, E >) expected(unexpected< G > &&err)
template<class... Args> requires std::is_constructible_v<T, Args...>
constexpr	expected (std::in_place_t, Args &&... args)
template<class U , class... Args> requires std::is_constructible_v<T, std::initializer_list<U> &, Args...>
constexpr	expected (std::in_place_t, std::initializer_list< U > il, Args &&... args)
template<class... Args> requires std::is_constructible_v<E, Args &&...>
constexpr	expected (stdx::unexpect_t, Args &&... args)
template<class U , class... Args> requires std::is_constructible_v<E, std::initializer_list<U> &, Args...>
constexpr	expected (stdx::unexpect_t, std::initializer_list< U > il, Args &&... args)
constexpr expected &	operator= (expected const &other)
constexpr expected &	operator= (expected &&other)
template<class U = T> requires ((!std::is_same_v<expected<T, E>, std::remove_cvref_t<U>> && // !impl::is_unexpected<std::remove_cvref_t<U>> && // std::is_constructible_v<T, U> && // std::is_assignable_v<T &, U> && // (std::is_nothrow_constructible_v<T, U> || // std::is_nothrow_move_constructible_v<T> || // std::is_nothrow_move_constructible_v<E>)))
constexpr expected &	operator= (U &&val)
template<class G , class GF = const G &> requires ((std::is_constructible_v<E, GF> && // std::is_assignable_v<E &, GF> && // (std::is_nothrow_constructible_v<E, GF> || // std::is_nothrow_move_constructible_v<T> || // std::is_nothrow_move_constructible_v<E>)))
constexpr expected &	operator= (const unexpected< G > &other)
template<class G , class GF = G> requires ((std::is_constructible_v<E, GF> && // std::is_assignable_v<E &, GF> && // (std::is_nothrow_constructible_v<E, GF> || // std::is_nothrow_move_constructible_v<T> || // std::is_nothrow_move_constructible_v<E>)))
constexpr expected &	operator= (unexpected< G > &&other)
constexpr	~expected ()
template<class... Args> requires (std::is_nothrow_constructible_v<T, Args...>)
constexpr T &	emplace (Args &&... args) noexcept
template<class U , class... Args> requires (std::is_nothrow_constructible_v<T, std::initializer_list<U> &, Args...>)
constexpr T &	emplace (std::initializer_list< U > il, Args &&... args) noexcept
constexpr void	swap (expected &other) noexcept((std::is_nothrow_move_constructible_v< T > &&//std::is_nothrow_move_constructible_v< E > &&//std::is_nothrow_swappable_v< T > &&//std::is_nothrow_swappable_v< E >))
constexpr bool	has_value () const
constexpr	operator bool () const noexcept
constexpr value_type &	value () &
constexpr const value_type &	value () const &
constexpr value_type &&	value () &&
constexpr const value_type &&	value () const &&
constexpr const value_type *	operator-> () const noexcept
constexpr value_type *	operator-> () noexcept
constexpr const value_type &	operator* () const &noexcept
constexpr value_type &	operator* () &noexcept
constexpr const value_type &&	operator* () const &&noexcept
constexpr value_type &&	operator* () &&noexcept
template<class U >
constexpr value_type	value_or (U &&v) const &
template<class U >
constexpr value_type	value_or (U &&v) &&
constexpr const error_type &	error () const &
constexpr const error_type &&	error () const &&
constexpr error_type &	error () &
constexpr error_type &&	error () &&
template<class Func >
constexpr auto	and_then (Func &&func) &
template<class Func >
constexpr auto	and_then (Func &&func) &&
template<class Func >
constexpr auto	and_then (Func &&func) const &
template<class Func >
constexpr auto	and_then (Func &&func) const &&
template<class Func >
constexpr auto	or_else (Func &&func) &
template<class Func >
constexpr auto	or_else (Func &&func) &&
template<class Func >
constexpr auto	or_else (Func &&func) const &
template<class Func >
constexpr auto	or_else (Func &&func) const &&
template<class Func >
constexpr auto	transform (Func &&func) &
template<class Func >
constexpr auto	transform (Func &&func) &&
template<class Func >
constexpr auto	transform (Func &&func) const &
template<class Func >
constexpr auto	transform (Func &&func) const &&

Public Attributes
constexpr G &	rhs: has_value_{rhs.has_value()} { if (rhs.has_value()) { std::construct_at(std::addressof(val_)
constexpr G std::forward< UF >	rhs
	else
constexpr G &&	rhs: has_value_{rhs.has_value()} { if (rhs.has_value()) { std::construct_at(std::addressof(val_)
T	val_
E	unex_

Static Public Attributes
template<class UF , class GF >
static constexpr bool	constructor_is_explicit
template<class U , class G , class UF , class GF >
static constexpr bool	can_value_convert_construct
template<class U >
static constexpr bool	can_construct_from_value_type

Private Member Functions
template<class U >
void	assign_val (U &&u)
template<class U >
void	assign_unex (U &&u)

Private Attributes
union {
T   val_
E   unex_
};
bool	has_value_

Friends
template<class T2 , class E2 > requires (!std::is_void_v<T2>)
constexpr friend bool	operator== (const expected &lhs, const stdx::expected< T2, E2 > &rhs)
template<class T2 > requires (!impl::is_expected<T2>)
constexpr friend bool	operator== (const expected &lhs, const T2 &rhs)
template<class E2 >
constexpr friend bool	operator== (const expected &lhs, const unexpected< E2 > &rhs)

Member Typedef Documentation

error_type

template<class T , class E >

using stdx::expected< T, E >::error_type = E

rebind

template<class T , class E >

template<typename U >

using stdx::expected< T, E >::rebind = expected<U, error_type>

unexpected_type

template<class T , class E >

using stdx::expected< T, E >::unexpected_type = unexpected<E>

value_type

template<class T , class E >

using stdx::expected< T, E >::value_type = T

Constructor & Destructor Documentation

expected() [1/9]

template<class T , class E >

constexpr stdx::expected< T, E >::expected ( )

inlineconstexprnoexcept

expected() [2/9]

template<class T , class E >

constexpr stdx::expected< T, E >::expected ( const expected< T, E > &  other )

constexprdefault

expected() [3/9]

template<class T , class E >

constexpr stdx::expected< T, E >::expected ( const expected< T, E > &  other )

inlineconstexprnoexcept

expected() [4/9]

template<class T , class E >

constexpr stdx::expected< T, E >::expected ( expected< T, E > &&  other )

constexprdefault

expected() [5/9]

template<class T , class E >

constexpr stdx::expected< T, E >::expected ( expected< T, E > &&  other )

inlineconstexprnoexcept

expected() [6/9]

template<class T , class E >

template<class... Args>
requires std::is_constructible_v<T, Args...>

constexpr stdx::expected< T, E >::expected ( std::in_place_t  , Args &&...  args  )

inlineexplicitconstexpr

expected() [7/9]

template<class T , class E >

template<class U , class... Args>
requires std::is_constructible_v<T, std::initializer_list<U> &, Args...>

constexpr stdx::expected< T, E >::expected ( std::in_place_t  , std::initializer_list< U >  il, Args &&...  args  )

inlineexplicitconstexpr

expected() [8/9]

template<class T , class E >

template<class... Args>
requires std::is_constructible_v<E, Args &&...>

constexpr stdx::expected< T, E >::expected ( stdx::unexpect_t  , Args &&...  args  )

inlineexplicitconstexpr

expected() [9/9]

template<class T , class E >

template<class U , class... Args>
requires std::is_constructible_v<E, std::initializer_list<U> &, Args...>

constexpr stdx::expected< T, E >::expected ( stdx::unexpect_t  , std::initializer_list< U >  il, Args &&...  args  )

inlineexplicitconstexpr

~expected()

template<class T , class E >

constexpr stdx::expected< T, E >::~expected ( )

inlineconstexpr

Member Function Documentation

and_then() [1/4]

template<class T , class E >

template<class Func >

constexpr auto stdx::expected< T, E >::and_then ( Func &&  func ) &

inlineconstexpr

and_then() [2/4]

template<class T , class E >

template<class Func >

constexpr auto stdx::expected< T, E >::and_then ( Func &&  func ) &&

inlineconstexpr

and_then() [3/4]

template<class T , class E >

template<class Func >

constexpr auto stdx::expected< T, E >::and_then ( Func &&  func ) const &

inlineconstexpr

and_then() [4/4]

template<class T , class E >

template<class Func >

constexpr auto stdx::expected< T, E >::and_then ( Func &&  func ) const &&

inlineconstexpr

assign_unex()

template<class T , class E >

template<class U >

void stdx::expected< T, E >::assign_unex ( U &&  u )

inlineprivate

assign_val()

template<class T , class E >

template<class U >

void stdx::expected< T, E >::assign_val ( U &&  u )

inlineprivate

emplace() [1/2]

template<class T , class E >

template<class... Args>
requires (std::is_nothrow_constructible_v<T, Args...>)

constexpr T & stdx::expected< T, E >::emplace ( Args &&...  args )

inlineconstexprnoexcept

emplace() [2/2]

template<class T , class E >

template<class U , class... Args>
requires (std::is_nothrow_constructible_v<T, std::initializer_list<U> &, Args...>)

constexpr T & stdx::expected< T, E >::emplace ( std::initializer_list< U >  il, Args &&...  args  )

inlineconstexprnoexcept

error() [1/4]

template<class T , class E >

constexpr error_type & stdx::expected< T, E >::error ( ) &

inlineconstexpr

error() [2/4]

template<class T , class E >

constexpr error_type && stdx::expected< T, E >::error ( ) &&

inlineconstexpr

error() [3/4]

template<class T , class E >

constexpr const error_type & stdx::expected< T, E >::error ( ) const &

inlineconstexpr

error() [4/4]

template<class T , class E >

constexpr const error_type && stdx::expected< T, E >::error ( ) const &&

inlineconstexpr

explicit() [1/5]

template<class T , class E >

template<class G >
requires std::is_constructible_v<E, const G &>

constexpr stdx::expected< T, E >::explicit ( !std::is_convertible_v< const G &, E >  ) const &

inlineconstexpr

explicit() [2/5]

template<class T , class E >

template<class G >
requires std::is_constructible_v<E, G>

constexpr stdx::expected< T, E >::explicit ( !std::is_convertible_v< G, E >  ) &&

inlineconstexpr

explicit() [3/5]

template<class T , class E >

template<class U = T>
requires can_construct_from_value_type<U>

constexpr stdx::expected< T, E >::explicit ( !std::is_convertible_v< U, T >  ) &&

inlineconstexpr

explicit() [4/5]

template<class T , class E >

template<class U , class G , class UF = std::add_lvalue_reference_t<const U>, class GF = const G &>

constexpr stdx::expected< T, E >::explicit ( constructor_is_explicit< UF, GF >  ) const

constexpr

explicit() [5/5]

template<class T , class E >

template<class U , class G , class UF = U, class GF = G>

constexpr stdx::expected< T, E >::explicit ( constructor_is_explicit< UF, GF >  )

constexpr

has_value()

template<class T , class E >

constexpr bool stdx::expected< T, E >::has_value ( ) const

inlineconstexpr

operator bool()

template<class T , class E >

constexpr stdx::expected< T, E >::operator bool ( ) const

inlineexplicitconstexprnoexcept

operator*() [1/4]

template<class T , class E >

constexpr value_type && stdx::expected< T, E >::operator* ( ) &&

inlineconstexprnoexcept

operator*() [2/4]

template<class T , class E >

constexpr value_type & stdx::expected< T, E >::operator* ( ) &

inlineconstexprnoexcept

operator*() [3/4]

template<class T , class E >

constexpr const value_type && stdx::expected< T, E >::operator* ( ) const &&

inlineconstexprnoexcept

operator*() [4/4]

template<class T , class E >

constexpr const value_type & stdx::expected< T, E >::operator* ( ) const &

inlineconstexprnoexcept

operator->() [1/2]

template<class T , class E >

constexpr const value_type * stdx::expected< T, E >::operator-> ( ) const

inlineconstexprnoexcept

operator->() [2/2]

template<class T , class E >

constexpr value_type * stdx::expected< T, E >::operator-> ( )

inlineconstexprnoexcept

operator=() [1/5]

template<class T , class E >

template<class G , class GF = const G &>
requires ((std::is_constructible_v<E, GF> && // std::is_assignable_v<E &, GF> && // (std::is_nothrow_constructible_v<E, GF> || // std::is_nothrow_move_constructible_v<T> || // std::is_nothrow_move_constructible_v<E>)))

constexpr expected & stdx::expected< T, E >::operator= ( const unexpected< G > &  other )

inlineconstexpr

operator=() [2/5]

template<class T , class E >

constexpr expected & stdx::expected< T, E >::operator= ( expected< T, E > &&  other )

inlineconstexpr

operator=() [3/5]

template<class T , class E >

constexpr expected & stdx::expected< T, E >::operator= ( expected< T, E > const &  other )

inlineconstexpr

operator=() [4/5]

template<class T , class E >

template<class U = T>
requires ((!std::is_same_v<expected<T, E>, std::remove_cvref_t<U>> && // !impl::is_unexpected<std::remove_cvref_t<U>> && // std::is_constructible_v<T, U> && // std::is_assignable_v<T &, U> && // (std::is_nothrow_constructible_v<T, U> || // std::is_nothrow_move_constructible_v<T> || // std::is_nothrow_move_constructible_v<E>)))

constexpr expected & stdx::expected< T, E >::operator= ( U &&  val )

inlineconstexpr

operator=() [5/5]

template<class T , class E >

template<class G , class GF = G>
requires ((std::is_constructible_v<E, GF> && // std::is_assignable_v<E &, GF> && // (std::is_nothrow_constructible_v<E, GF> || // std::is_nothrow_move_constructible_v<T> || // std::is_nothrow_move_constructible_v<E>)))

constexpr expected & stdx::expected< T, E >::operator= ( unexpected< G > &&  other )

inlineconstexpr

or_else() [1/4]

template<class T , class E >

template<class Func >

constexpr auto stdx::expected< T, E >::or_else ( Func &&  func ) &

inlineconstexpr

or_else() [2/4]

template<class T , class E >

template<class Func >

constexpr auto stdx::expected< T, E >::or_else ( Func &&  func ) &&

inlineconstexpr

or_else() [3/4]

template<class T , class E >

template<class Func >

constexpr auto stdx::expected< T, E >::or_else ( Func &&  func ) const &

inlineconstexpr

or_else() [4/4]

template<class T , class E >

template<class Func >

constexpr auto stdx::expected< T, E >::or_else ( Func &&  func ) const &&

inlineconstexpr

swap()

template<class T , class E >

constexpr void stdx::expected< T, E >::swap ( expected< T, E > &  other )

inlineconstexprnoexcept

transform() [1/4]

template<class T , class E >

template<class Func >

constexpr auto stdx::expected< T, E >::transform ( Func &&  func ) &

inlineconstexpr

transform() [2/4]

template<class T , class E >

template<class Func >

constexpr auto stdx::expected< T, E >::transform ( Func &&  func ) &&

inlineconstexpr

transform() [3/4]

template<class T , class E >

template<class Func >

constexpr auto stdx::expected< T, E >::transform ( Func &&  func ) const &

inlineconstexpr

transform() [4/4]

template<class T , class E >

template<class Func >

constexpr auto stdx::expected< T, E >::transform ( Func &&  func ) const &&

inlineconstexpr

value() [1/4]

template<class T , class E >

constexpr value_type & stdx::expected< T, E >::value ( ) &

inlineconstexpr

value() [2/4]

template<class T , class E >

constexpr value_type && stdx::expected< T, E >::value ( ) &&

inlineconstexpr

value() [3/4]

template<class T , class E >

constexpr const value_type & stdx::expected< T, E >::value ( ) const &

inlineconstexpr

value() [4/4]

template<class T , class E >

constexpr const value_type && stdx::expected< T, E >::value ( ) const &&

inlineconstexpr

value_or() [1/2]

template<class T , class E >

template<class U >

constexpr value_type stdx::expected< T, E >::value_or ( U &&  v ) &&

inlineconstexpr

value_or() [2/2]

template<class T , class E >

template<class U >

constexpr value_type stdx::expected< T, E >::value_or ( U &&  v ) const &

inlineconstexpr

Friends And Related Function Documentation

operator== [1/3]

template<class T , class E >

template<class T2 , class E2 >
requires (!std::is_void_v<T2>)

constexpr friend bool operator== ( const expected< T, E > &  lhs, const stdx::expected< T2, E2 > &  rhs  )

friend

operator== [2/3]

template<class T , class E >

template<class T2 >
requires (!impl::is_expected<T2>)

constexpr friend bool operator== ( const expected< T, E > &  lhs, const T2 &  rhs  )

friend

operator== [3/3]

template<class T , class E >

template<class E2 >

constexpr friend bool operator== ( const expected< T, E > &  lhs, const unexpected< E2 > &  rhs  )

friend

Member Data Documentation

union { ... } stdx::expected< T, E >::@31

can_construct_from_value_type

template<class T , class E >

template<class U >

constexpr bool stdx::expected< T, E >::can_construct_from_value_type

staticconstexpr

Initial value:

=
      !std::is_same_v<std::in_place_t, std::remove_cvref_t<U>> &&
      !std::is_same_v<expected, std::remove_cvref_t<U>> &&
      std::is_constructible_v<T, U> &&
      !impl::is_unexpected<std::remove_cvref_t<U>> &&
      !impl::is_expected<std::remove_cvref_t<T>>

can_value_convert_construct

template<class T , class E >

template<class U , class G , class UF , class GF >

constexpr bool stdx::expected< T, E >::can_value_convert_construct

staticconstexpr

Initial value:

=
      (std::is_constructible_v<T, UF> &&  
       std::is_constructible_v<E, GF> &&
       !std::is_constructible_v<T, expected<U, G> &> &&
       !std::is_constructible_v<T, expected<U, G>> &&
       !std::is_constructible_v<T, const expected<U, G> &> &&
       !std::is_constructible_v<T, const expected<U, G>> &&
       !std::is_convertible_v<expected<U, G> &, T> &&
       !std::is_convertible_v<expected<U, G>, T> &&
       !std::is_convertible_v<const expected<U, G> &, T> &&
       !std::is_convertible_v<const expected<U, G>, T> &&
       !std::is_constructible_v<unexpected<E>, expected<U, G> &> &&
       !std::is_constructible_v<unexpected<E>, expected<U, G>> &&
       !std::is_constructible_v<unexpected<E>, const expected<U, G> &> &&
       !std::is_constructible_v<unexpected<E>, const expected<U, G>>)

constructor_is_explicit

template<class T , class E >

template<class UF , class GF >

constexpr bool stdx::expected< T, E >::constructor_is_explicit

staticconstexpr

Initial value:

=
      !std::is_convertible_v<UF, T> || !std::is_convertible_v<GF, E>

else

template<class T , class E >

stdx::expected< T, E >::else

Initial value:

{
      std::construct_at(std::addressof(unex_), std::forward<GF>(rhs.error()))

has_value_

template<class T , class E >

bool stdx::expected< T, E >::has_value_

private

rhs [1/3]

template<class T , class E >

constexpr G std::forward< UF > stdx::expected< T, E >::rhs

rhs [2/3]

template<class T , class E >

constexpr G std::forward<UF> stdx::expected< T, E >::rhs

rhs [3/3]

template<class T , class E >

constexpr G&& stdx::expected< T, E >::rhs

unex_

template<class T , class E >

E stdx::expected< T, E >::unex_

val_

template<class T , class E >

T stdx::expected< T, E >::val_

---

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

• router/src/harness/include/mysql/harness/stdx/expected.h