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.
[edit] Parameters
| m | - | mutex to acquire ownership of | 
| t | - | tag parameter used to select non-locking version of the constructor | 
[edit] Exceptions
1) Throws any exceptions thrown by m.lock()
2) Throws nothing


