xentara::utils::atomic::Optional< Type > Class Template Reference

An atomic version of std::optional. More...

#include <atomic/Optional.hpp>

Public Member Functions
constexpr	Optional () noexcept=default
	Default constructor.
constexpr	Optional (std::optional< Type > value) noexcept
	Constructor that initializes the value.
constexpr	Optional (Type value) noexcept
	Constructor that initializes the value to a real value.
constexpr	Optional (std::nullopt_t) noexcept
	Constructor that initializes the value to std::nullopt.
auto	operator= (std::optional< Type > value) noexcept -> std::optional< Type >
	Atomically stores the value using std::memory_order_seq_cst.
auto	operator= (Type value) noexcept -> std::optional< Type >
	Atomically stores a real value using std::memory_order_seq_cst.
auto	operator= (std::nullopt_t) noexcept -> std::optional< Type >
	Atomically stores an std::nullopt value using std::memory_order_seq_cst.
	operator std::optional< Type > () const noexcept
	Atomically loads the value using std::memory_order_seq_cst.
auto	load () const noexcept -> std::optional< Type >
	Atomically loads the value.
auto	load (std::memory_order memoryOrder) const noexcept -> std::optional< Type >
	Atomically loads the value.
auto	store (std::optional< Type > value) noexcept -> void
	Atomically stores the value.
auto	store (std::optional< Type > value, std::memory_order memoryOrder) noexcept -> void
	Atomically stores the value.
auto	store (Type value) noexcept -> void
	Atomically stores a real value.
auto	store (Type value, std::memory_order memoryOrder) noexcept -> void
	Atomically stores a real value.
auto	store (std::nullopt_t) noexcept -> void
	Atomically stores an std::nullopt.
auto	store (std::nullopt_t, std::memory_order memoryOrder) noexcept -> void
	Atomically stores an std::nullopt.
auto	exchange (std::optional< Type > newValue) noexcept -> std::optional< Type >
	Atomically exchanges the value with a new value.
auto	exchange (std::optional< Type > newValue, std::memory_order memoryOrder) noexcept -> std::optional< Type >
	Atomically exchanges the value with a new value.
auto	exchange (Type newValue) noexcept -> std::optional< Type >
	Atomically exchanges the value with a real value.
auto	exchange (Type newValue, std::memory_order memoryOrder) noexcept -> std::optional< Type >
	Atomically exchanges the value with a real value.
auto	exchange (std::nullopt_t) noexcept -> std::optional< Type >
	Atomically exchanges the value with an std::nullopt.
auto	exchange (std::nullopt_t, std::memory_order memoryOrder) noexcept -> std::optional< Type >
	Atomically exchanges the value with an std::nullopt.
auto	compare_exchange_weak (std::optional< Type > &expectedValue, std::optional< Type > newValue) noexcept -> bool
	Conditionally atomically exchanges the value with a new value.
auto	compare_exchange_weak (std::optional< Type > &expectedValue, std::optional< Type > newValue, std::memory_order memoryOrder) noexcept -> bool
	Conditionally atomically exchanges the value with a new value.
auto	compare_exchange_weak (std::optional< Type > &expectedValue, std::optional< Type > newValue, std::memory_order memoryOrderForSuccess, std::memory_order memoryOrderForFailure) noexcept -> bool
	Conditionally atomically exchanges the value with a new value.
auto	compare_exchange_weak (std::optional< Type > &expectedValue, Type newValue) noexcept -> bool
	Conditionally atomically exchanges the value with a real value.
auto	compare_exchange_weak (std::optional< Type > &expectedValue, Type newValue, std::memory_order memoryOrder) noexcept -> bool
	Conditionally atomically exchanges the value with a real value.
auto	compare_exchange_weak (std::optional< Type > &expectedValue, Type newValue, std::memory_order memoryOrderForSuccess, std::memory_order memoryOrderForFailure) noexcept -> bool
	Conditionally atomically exchanges the value with a real value.
auto	compare_exchange_weak (std::optional< Type > &expectedValue, std::nullopt_t) noexcept -> bool
	Conditionally atomically exchanges the value with a new value.
auto	compare_exchange_weak (std::optional< Type > &expectedValue, std::nullopt_t, std::memory_order memoryOrder) noexcept -> bool
	Conditionally atomically exchanges the value with a new value.
auto	compare_exchange_weak (std::optional< Type > &expectedValue, std::nullopt_t, std::memory_order memoryOrderForSuccess, std::memory_order memoryOrderForFailure) noexcept -> bool
	Conditionally atomically exchanges the value with a new value.
auto	compare_exchange_strong (std::optional< Type > &expectedValue, std::optional< Type > newValue) noexcept -> bool
	Conditionally atomically exchanges the value with a new value.
auto	compare_exchange_strong (std::optional< Type > &expectedValue, std::optional< Type > newValue, std::memory_order memoryOrder) noexcept -> bool
	Conditionally atomically exchanges the value with a new value.
auto	compare_exchange_strong (std::optional< Type > &expectedValue, std::optional< Type > newValue, std::memory_order memoryOrderForSuccess, std::memory_order memoryOrderForFailure) noexcept -> bool
	Conditionally atomically exchanges the value with a new value.
auto	compare_exchange_strong (std::optional< Type > &expectedValue, Type newValue) noexcept -> bool
	Conditionally atomically exchanges the value with a real value.
auto	compare_exchange_strong (std::optional< Type > &expectedValue, Type newValue, std::memory_order memoryOrder) noexcept -> bool
	Conditionally atomically exchanges the value with a real value.
auto	compare_exchange_strong (std::optional< Type > &expectedValue, Type newValue, std::memory_order memoryOrderForSuccess, std::memory_order memoryOrderForFailure) noexcept -> bool
	Conditionally atomically exchanges the value with a real value.
auto	compare_exchange_strong (std::optional< Type > &expectedValue, std::nullopt_t) noexcept -> bool
	Conditionally atomically exchanges the value with a new value.
auto	compare_exchange_strong (std::optional< Type > &expectedValue, std::nullopt_t, std::memory_order memoryOrder) noexcept -> bool
	Conditionally atomically exchanges the value with a new value.
auto	compare_exchange_strong (std::optional< Type > &expectedValue, std::nullopt_t, std::memory_order memoryOrderForSuccess, std::memory_order memoryOrderForFailure) noexcept -> bool
	Conditionally atomically exchanges the value with a new value.
auto	is_lock_free () const noexcept -> bool
	Determines whether operations on this object are lock free.
	Optional (const Optional &)=delete
	Deleted copy constructor.
auto	operator= (const Optional &)=delete
	Deleted assignment opertaor.

Static Public Attributes
static constexpr bool	is_always_lock_free
	Determines whether operations on all objects of thsi class are lock free.

Detailed Description

template<typename Type>
class xentara::utils::atomic::Optional< Type >

An atomic version of std::optional.

This class allows defining atomics that operate contain [std::optional]s. Normal [std::atomic]s cannot contain [std::optional]s, because std::optional is not guaranteed to be trivially copyable.

Requirements:

Type must be suitable for use in an std::atomic. Additionally Type must be trivially destructible.

Note

Atomic optionals for IEEE-754 floating point types (float, double, long double) use a special internal encoding to increase the chance that atomic optionals for these types are lock-free. As a side-effect, atomic::Optional for these types may not preserve the exact encoding of certain special signalling NaN values. This is only relevant if you need to distinguish between different binary encodings of signalling NaNs. The standard signaling NaN returned by std::numeric_limits<Type>::signaling_NaN as well as its negative counterpart are guaranteed to be preserved exactly, however.

Constructor & Destructor Documentation

Optional() [1/5]

template<typename Type >

constexpr xentara::utils::atomic::Optional< Type >::Optional ( )

constexprdefaultnoexcept

Default constructor.

This constructor creates an object containing std::nullopt.

Optional() [2/5]

template<typename Type >

constexpr xentara::utils::atomic::Optional< Type >::Optional ( std::optional< Type >  value )

constexprnoexcept

Constructor that initializes the value.

Optional() [3/5]

template<typename Type >

constexpr xentara::utils::atomic::Optional< Type >::Optional ( Type  value )

constexprnoexcept

Constructor that initializes the value to a real value.

Optional() [4/5]

template<typename Type >

constexpr xentara::utils::atomic::Optional< Type >::Optional ( std::nullopt_t  )

constexprnoexcept

Constructor that initializes the value to std::nullopt.

This constructor creates an object containing std::nullopt. It is equivalient to the default constructor.

Optional() [5/5]

template<typename Type >

xentara::utils::atomic::Optional< Type >::Optional ( const Optional< Type > &  )

delete

Deleted copy constructor.

Member Function Documentation

compare_exchange_strong() [1/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_strong ( std::optional< Type > &  expectedValue, std::nullopt_t    ) -> bool

noexcept

Conditionally atomically exchanges the value with a new value.

See also

std::atomic::compare_exchange_strong()

compare_exchange_strong() [2/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_strong ( std::optional< Type > &  expectedValue, std::nullopt_t  , std::memory_order  memoryOrder  ) -> bool

noexcept

Conditionally atomically exchanges the value with a new value.

See also

std::atomic::compare_exchange_strong()

compare_exchange_strong() [3/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_strong ( std::optional< Type > &  expectedValue, std::nullopt_t  , std::memory_order  memoryOrderForSuccess, std::memory_order  memoryOrderForFailure  ) -> bool

noexcept

Conditionally atomically exchanges the value with a new value.

See also

std::atomic::compare_exchange_strong()

compare_exchange_strong() [4/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_strong ( std::optional< Type > &  expectedValue, std::optional< Type >  newValue  ) -> bool

noexcept

Conditionally atomically exchanges the value with a new value.

See also

std::atomic::compare_exchange_strong()

compare_exchange_strong() [5/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_strong ( std::optional< Type > &  expectedValue, std::optional< Type >  newValue, std::memory_order  memoryOrder  ) -> bool

noexcept

Conditionally atomically exchanges the value with a new value.

See also

std::atomic::compare_exchange_strong()

compare_exchange_strong() [6/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_strong ( std::optional< Type > &  expectedValue, std::optional< Type >  newValue, std::memory_order  memoryOrderForSuccess, std::memory_order  memoryOrderForFailure  ) -> bool

noexcept

Conditionally atomically exchanges the value with a new value.

See also

std::atomic::compare_exchange_strong()

compare_exchange_strong() [7/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_strong ( std::optional< Type > &  expectedValue, Type  newValue  ) -> bool

noexcept

Conditionally atomically exchanges the value with a real value.

See also

std::atomic::compare_exchange_strong()

compare_exchange_strong() [8/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_strong ( std::optional< Type > &  expectedValue, Type  newValue, std::memory_order  memoryOrder  ) -> bool

noexcept

Conditionally atomically exchanges the value with a real value.

See also

std::atomic::compare_exchange_strong()

compare_exchange_strong() [9/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_strong ( std::optional< Type > &  expectedValue, Type  newValue, std::memory_order  memoryOrderForSuccess, std::memory_order  memoryOrderForFailure  ) -> bool

noexcept

Conditionally atomically exchanges the value with a real value.

See also

std::atomic::compare_exchange_strong()

compare_exchange_weak() [1/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_weak ( std::optional< Type > &  expectedValue, std::nullopt_t    ) -> bool

noexcept

Conditionally atomically exchanges the value with a new value.

See also

std::atomic::compare_exchange_weak()

compare_exchange_weak() [2/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_weak ( std::optional< Type > &  expectedValue, std::nullopt_t  , std::memory_order  memoryOrder  ) -> bool

noexcept

Conditionally atomically exchanges the value with a new value.

See also

std::atomic::compare_exchange_weak()

compare_exchange_weak() [3/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_weak ( std::optional< Type > &  expectedValue, std::nullopt_t  , std::memory_order  memoryOrderForSuccess, std::memory_order  memoryOrderForFailure  ) -> bool

noexcept

Conditionally atomically exchanges the value with a new value.

See also

std::atomic::compare_exchange_weak()

compare_exchange_weak() [4/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_weak ( std::optional< Type > &  expectedValue, std::optional< Type >  newValue  ) -> bool

noexcept

Conditionally atomically exchanges the value with a new value.

See also

std::atomic::compare_exchange_weak()

compare_exchange_weak() [5/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_weak ( std::optional< Type > &  expectedValue, std::optional< Type >  newValue, std::memory_order  memoryOrder  ) -> bool

noexcept

Conditionally atomically exchanges the value with a new value.

See also

std::atomic::compare_exchange_weak()

compare_exchange_weak() [6/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_weak ( std::optional< Type > &  expectedValue, std::optional< Type >  newValue, std::memory_order  memoryOrderForSuccess, std::memory_order  memoryOrderForFailure  ) -> bool

noexcept

Conditionally atomically exchanges the value with a new value.

See also

std::atomic::compare_exchange_weak()

compare_exchange_weak() [7/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_weak ( std::optional< Type > &  expectedValue, Type  newValue  ) -> bool

noexcept

Conditionally atomically exchanges the value with a real value.

See also

std::atomic::compare_exchange_weak()

compare_exchange_weak() [8/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_weak ( std::optional< Type > &  expectedValue, Type  newValue, std::memory_order  memoryOrder  ) -> bool

noexcept

Conditionally atomically exchanges the value with a real value.

See also

std::atomic::compare_exchange_weak()

compare_exchange_weak() [9/9]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::compare_exchange_weak ( std::optional< Type > &  expectedValue, Type  newValue, std::memory_order  memoryOrderForSuccess, std::memory_order  memoryOrderForFailure  ) -> bool

noexcept

Conditionally atomically exchanges the value with a real value.

See also

std::atomic::compare_exchange_weak()

exchange() [1/6]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::exchange ( std::nullopt_t  ) -> std::optional<Type>

noexcept

Atomically exchanges the value with an std::nullopt.

See also

std::atomic::exchange()

exchange() [2/6]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::exchange ( std::nullopt_t  , std::memory_order  memoryOrder  ) -> std::optional<Type>

noexcept

Atomically exchanges the value with an std::nullopt.

See also

std::atomic::exchange()

exchange() [3/6]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::exchange ( std::optional< Type >  newValue ) -> std::optional<Type>

noexcept

Atomically exchanges the value with a new value.

See also

std::atomic::exchange()

exchange() [4/6]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::exchange ( std::optional< Type >  newValue, std::memory_order  memoryOrder  ) -> std::optional<Type>

noexcept

Atomically exchanges the value with a new value.

See also

std::atomic::exchange()

exchange() [5/6]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::exchange ( Type  newValue ) -> std::optional<Type>

noexcept

Atomically exchanges the value with a real value.

See also

std::atomic::exchange()

exchange() [6/6]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::exchange ( Type  newValue, std::memory_order  memoryOrder  ) -> std::optional<Type>

noexcept

Atomically exchanges the value with a real value.

See also

std::atomic::exchange()

is_lock_free()

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::is_lock_free ( ) const -> bool

noexcept

Determines whether operations on this object are lock free.

See also

std::atomic::is_lock_free()

load() [1/2]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::load ( ) const -> std::optional<Type>

noexcept

Atomically loads the value.

See also

std::atomic::load()

load() [2/2]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::load ( std::memory_order  memoryOrder ) const -> std::optional<Type>

noexcept

Atomically loads the value.

See also

std::atomic::load()

operator std::optional< Type >()

template<typename Type >

xentara::utils::atomic::Optional< Type >::operator std::optional< Type > ( ) const

noexcept

Atomically loads the value using std::memory_order_seq_cst.

operator=() [1/4]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::operator= ( const Optional< Type > &  )

delete

Deleted assignment opertaor.

operator=() [2/4]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::operator= ( std::nullopt_t  ) -> std::optional<Type>

noexcept

Atomically stores an std::nullopt value using std::memory_order_seq_cst.

operator=() [3/4]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::operator= ( std::optional< Type >  value ) -> std::optional<Type>

noexcept

Atomically stores the value using std::memory_order_seq_cst.

operator=() [4/4]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::operator= ( Type  value ) -> std::optional<Type>

noexcept

Atomically stores a real value using std::memory_order_seq_cst.

store() [1/6]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::store ( std::nullopt_t  ) -> void

noexcept

Atomically stores an std::nullopt.

See also

std::atomic::store()

store() [2/6]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::store ( std::nullopt_t  , std::memory_order  memoryOrder  ) -> void

noexcept

Atomically stores an std::nullopt.

See also

std::atomic::store()

store() [3/6]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::store ( std::optional< Type >  value ) -> void

noexcept

Atomically stores the value.

See also

std::atomic::store()

store() [4/6]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::store ( std::optional< Type >  value, std::memory_order  memoryOrder  ) -> void

noexcept

Atomically stores the value.

See also

std::atomic::store()

store() [5/6]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::store ( Type  value ) -> void

noexcept

Atomically stores a real value.

See also

std::atomic::store()

store() [6/6]

template<typename Type >

auto xentara::utils::atomic::Optional< Type >::store ( Type  value, std::memory_order  memoryOrder  ) -> void

noexcept

Atomically stores a real value.

See also

std::atomic::store()

Member Data Documentation

is_always_lock_free

template<typename Type >

constexpr bool xentara::utils::atomic::Optional< Type >::is_always_lock_free

staticconstexpr

Determines whether operations on all objects of thsi class are lock free.

See also

std::atomic::is_lock_free()