< cpp‎ | io‎ | basic syncbuf
explicit basic_syncbuf( streambuf_type* obuf = nullptr )
: basic_syncbuf( obuf, Allocator() ) {}
basic_syncbuf( streambuf_type* obuf, const Allocator& a);
basic_syncbuf( basic_syncbuf&& rhs);
1,2) Creates an instance of std::basic_syncbuf with emit-on-sync policy set to false, wrapped streambuffer set to obuf, and using a as the allocator for temporary storage.
3) Move constructor: move-constructs a std::basic_syncbuf object by moving all contents from another std::basic_syncbuf object rhs, including the temporary storage, the wrapped stream pointer, policy, and all other state (such as the mutex pointer). After move, rhs is not associated with a stream, and rhs.get_wrapped()==nullptr. The put area member pointers of the base class std::basic_streambuf of rhs are guaranteed to be null. Destroying a moved-from rhs will not produce any output.


obuf - pointer to the std::basic_streambuf to wrap
a - the allocator to use for temporary storage
rhs - another std::basic_syncbuf to move from


1,2) May throw std::bad_alloc from the constructor of the internal temporary storage or std::system_error from the mutex construction.


Typically called by the appropriate constructors of std::basic_osyncstream.


See also

synchronizes the buffers with the associated character sequence
(virtual protected member function of std::basic_streambuf<CharT,Traits>)
atomically transmits the entire internal buffer to the wrapped streambuf
(public member function)