< cpp‎ | thread‎ | lock guard
explicit lock_guard( mutex_type& m );
(1) (since C++11)
lock_guard( mutex_type& m, std::adopt_lock_t t );
(2) (since C++11)
lock_guard( const lock_guard& ) = delete;
(3) (since C++11)

Acquires ownership of the given mutex m.

1) Effectively calls m.lock(). The behavior is undefined if m is not a recursive mutex and the current thread already owns m.
2) Acquires ownership of the mutex m without attempting to lock it. The behavior is undefined if the current thread does not own m.
3) Copy constructor is deleted.

The behavior is undefined if m is destroyed before the lock_guard object is.


m - mutex to acquire ownership of
t - tag parameter used to select non-locking version of the constructor


1) Throws any exceptions thrown by m.lock()

2) Throws nothing