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Atomic< Type > Struct Template Referencefinal
juce_core » memory

A simple wrapper around std::atomic. More...

`#include <juce_Atomic.h>`

## Public Types
using | DiffType = typename AtomicHelpers::DiffTypeHelper< Type >::Type

## Public Member Functions
| Atomic () noexcept
| Creates a new value, initialised to zero.
| Atomic (Type initialValue) noexcept
| Creates a new value, with a given initial value.
| Atomic (const Atomic &other) noexcept
| Copies another value (atomically).
| ~Atomic () noexcept
| Destructor.
Type | get () const noexcept
| Atomically reads and returns the current value.
void | set (Type newValue) noexcept
| Atomically sets the current value.
Type | exchange (Type newValue) noexcept
| Atomically sets the current value, returning the value that was replaced.
bool | compareAndSetBool (Type newValue, Type valueToCompare) noexcept
| Atomically compares this value with a target value, and if it is equal, sets this to be equal to a new value.
Atomic< Type > & | operator= (const Atomic &other) noexcept
| Copies another value into this one (atomically).
Atomic< Type > & | operator= (Type newValue) noexcept
| Copies another value into this one (atomically).
Type | operator+= (DiffType amountToAdd) noexcept
| Atomically adds a number to this value, returning the new value.
Type | operator-= (DiffType amountToSubtract) noexcept
| Atomically subtracts a number from this value, returning the new value.
Type | operator++ () noexcept
| Atomically increments this value, returning the new value.
Type | operator-- () noexcept
| Atomically decrements this value, returning the new value.
void | memoryBarrier () noexcept
| Implements a memory read/write barrier.

## Public Attributes
std::atomic< Type > | value
| The std::atomic object that this class operates on.

## Detailed Description

template<typename Type>
struct Atomic< Type >

A simple wrapper around std::atomic.

## Member Typedef Documentation

## ◆ DiffType

template<typename Type >

using Atomic< Type >::DiffType = typename AtomicHelpers::DiffTypeHelper<Type>::Type

## Constructor & Destructor Documentation

## ◆ Atomic() [1/3]

template<typename Type >

Atomic< Type >::Atomic | ( |  | ) |
| noexcept

Creates a new value, initialised to zero.

## ◆ Atomic() [2/3]

template<typename Type >

Atomic< Type >::Atomic | ( | Type | initialValue | ) |
| noexcept

Creates a new value, with a given initial value.

## ◆ Atomic() [3/3]

template<typename Type >

Atomic< Type >::Atomic | ( | const Atomic< Type > & | other | ) |
| noexcept

Copies another value (atomically).

## ◆ ~Atomic()

template<typename Type >

Atomic< Type >::~Atomic | ( |  | ) |
| noexcept

Destructor.

## Member Function Documentation

## ◆ get()

template<typename Type >

Type Atomic< Type >::get | ( |  | ) | const
| noexcept

Atomically reads and returns the current value.

References Atomic< Type >::value.

Referenced by ThreadLocalValue< Type >::get(), ThreadLocalValue< Type >::releaseCurrentThreadStorage(), and ThreadLocalValue< Type >::~ThreadLocalValue().

## ◆ set()

template<typename Type >

void Atomic< Type >::set | ( | Type | newValue | ) |
| noexcept

Atomically sets the current value.

References Atomic< Type >::value.

## ◆ exchange()

template<typename Type >

Type Atomic< Type >::exchange | ( | Type | newValue | ) |
| noexcept

Atomically sets the current value, returning the value that was replaced.

References Atomic< Type >::value.

## ◆ compareAndSetBool()

template<typename Type >

bool Atomic< Type >::compareAndSetBool | ( | Type | newValue,
|  | Type | valueToCompare
| ) |  |
| noexcept

Atomically compares this value with a target value, and if it is equal, sets this to be equal to a new value.

This operation is the atomic equivalent of doing this:

bool compareAndSetBool (Type newValue, Type valueToCompare)
{
if (get() == valueToCompare)
{
set (newValue);
return true;
}
return false;
}
Atomic::set
void set(Type newValue) noexcept
Atomically sets the current value.
Definition juce_Atomic.h:68
Atomic::compareAndSetBool
bool compareAndSetBool(Type newValue, Type valueToCompare) noexcept
Atomically compares this value with a target value, and if it is equal, sets this to be equal to a ne...
Definition juce_Atomic.h:97
Atomic::get
Type get() const noexcept
Atomically reads and returns the current value.
Definition juce_Atomic.h:65

Internally, this method calls std::atomic::compare_exchange_strong with memory_order_seq_cst (the strictest std::memory_order).

Returns
  true if the comparison was true and the value was replaced; false if the comparison failed and the value was left unchanged.

See also
  compareAndSetValue

References Atomic< Type >::value.

Referenced by ThreadLocalValue< Type >::get().

## ◆ operator=() [1/2]

template<typename Type >

Atomic< Type > & Atomic< Type >::operator= | ( | const Atomic< Type > & | other | ) |
| noexcept

Copies another value into this one (atomically).

References Atomic< Type >::value.

## ◆ operator=() [2/2]

template<typename Type >

Atomic< Type > & Atomic< Type >::operator= | ( | Type | newValue | ) |
| noexcept

Copies another value into this one (atomically).

References Atomic< Type >::value.

## ◆ operator+=()

template<typename Type >

Type Atomic< Type >::operator+= | ( | DiffType | amountToAdd | ) |
| noexcept

Atomically adds a number to this value, returning the new value.

References Atomic< Type >::value.

## ◆ operator-=()

template<typename Type >

Type Atomic< Type >::operator-= | ( | DiffType | amountToSubtract | ) |
| noexcept

Atomically subtracts a number from this value, returning the new value.

References Atomic< Type >::value.

## ◆ operator++()

template<typename Type >

Type Atomic< Type >::operator++ | ( |  | ) |
| noexcept

Atomically increments this value, returning the new value.

References Atomic< Type >::value.

## ◆ operator--()

template<typename Type >

Type Atomic< Type >::operator-- | ( |  | ) |
| noexcept

Atomically decrements this value, returning the new value.

References Atomic< Type >::value.

## ◆ memoryBarrier()

template<typename Type >

void Atomic< Type >::memoryBarrier | ( |  | ) |
| noexcept

Implements a memory read/write barrier.

Internally this calls std::atomic_thread_fence with memory_order_seq_cst (the strictest std::memory_order).

## Member Data Documentation

## ◆ value

template<typename Type >

std::atomic<Type> Atomic< Type >::value

The std::atomic object that this class operates on.

Referenced by Atomic< Type >::compareAndSetBool(), Atomic< Type >::exchange(), Atomic< Type >::get(), Atomic< Type >::operator++(), Atomic< Type >::operator+=(), Atomic< Type >::operator--(), Atomic< Type >::operator-=(), Atomic< Type >::operator=(), Atomic< Type >::operator=(), and Atomic< Type >::set().

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

- juce_Atomic.h