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

object

<mutex>

std::try_to_lock

constexpr try_to_lock_t try_to_lock {};

Try to lock

Value used as possible argument to unique_lock's constructor.

unique_lock objects constructed with try_to_lock attempt to lock the mutex object by calling its try_lock member instead of its lock member.

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

try_to_lock_t is an empty class.