NAME¶

std::atomic::is_always_lock_free - std::atomic::is_always_lock_free

Synopsis¶

static constexpr bool is_always_lock_free = (since C++17)
/*implementation-defined*/;

Equals true if this atomic type is always lock-free and false if it is never or
sometimes lock-free.

The value of this constant is consistent with both the macro ATOMIC_xxx_LOCK_FREE,
where defined, with the member function is_lock_free and non-member function
std::atomic_is_lock_free.

Notes¶

There is no non-member function equivalent of this static member constant because
non-member functions take pointers to atomic types, and therefore aren't as useful
in constant expressions.

Feature-test macro Value Std Feature
__cpp_lib_atomic_is_always_lock_free 201603L (C++17) constexpr
atomic<T>::is_always_lock_free

See also¶

is_lock_free checks if the atomic object is lock-free
(public member function)
atomic_is_lock_free checks if the atomic type's operations are lock-free
(C++11) (function template)