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std::unique_lock
 
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bool owns_lock() const;
 ( C++11)
, *this .
:
Checks whether *this owns a locked mutex or not.
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true *this , false .
:
true if *this has an associated mutex and has acquired ownership of it, false otherwise.
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noexcept:  
noexcept
  

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:
tests whether the lock owns its associated mutex
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