NAME

std::atomic_ref::is_lock_free - std::atomic_ref::is_lock_free

Synopsis

bool is_lock_free() const noexcept; (since C++20)

Checks whether the atomic operations on this object are lock-free.

Parameters

(none)

Return value

true if the atomic operations on this object are lock-free, false otherwise.

Notes

All atomic types except for std::atomic_flag may be implemented using mutexes or
other locking operations, rather than using the lock-free atomic CPU instructions.
Atomic types are also allowed to be sometimes lock-free, e.g. if only aligned memory
accesses are naturally atomic on a given architecture, misaligned objects of the
same type have to use locks.

The C++ standard recommends (but does not require) that lock-free atomic operations
are also address-free, that is, suitable for communication between processes using
shared memory.

Example

This section is incomplete
Reason: no example

See also

is_always_lock_free indicates that the type is always lock-free
[static] (public static member constant)