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

object

<mutex>

std::adopt_lock

constexpr adopt_lock_t adopt_lock {};

Adopt lock

Value used as possible argument to the constructor of unique_lock or lock_guard.

unique_lock objects constructed with adopt_lock do not lock the mutex object on construction, assuming instead that it is already locked by the current thread.

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

adopt_lock_t is an empty class.