# std::lock_guard::lock_guard

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< 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.

### Parameters

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

### Exceptions

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

2) Throws nothing

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