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Showing content from https://cplusplus.com/reference/mutex/defer_lock/ below:

object

<mutex>

std::defer_lock
constexpr defer_lock_t defer_lock {};

Defer lock

Value used as possible argument to unique_lock's constructor.

unique_lock objects constructed with defer_lock do not lock the mutex object automatically on construction, initializing them as not owning a lock.

The value is a compile-time constant that carries no state, and is merely used to disambiguate between constructor signatures.

defer_lock_t is an empty class.



See also
try_to_lock
Try to lock (object)
adopt_lock
Adopt lock (object)

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