condition_variable();

condition_variable( const condition_variable& ) = delete;

1) Constructs an object of type std::condition_variable.

2) Copy constructor is deleted.

1) May throw std::system_error with std::error_condition equal to std::errc::operation_not_permitted if the thread has no privilege to create a condition variable, std::errc::resource_unavailable_try_again if a non-memory resource limitation prevents this initialization, or another implementation-defined value.