NAME¶

std::basic_syncbuf::basic_syncbuf - std::basic_syncbuf::basic_syncbuf

Synopsis¶

basic_syncbuf() (1)
: basic_syncbuf(nullptr)
explicit basic_syncbuf( streambuf_type* obuf ) (2)
: basic_syncbuf( obuf, Allocator() ) {}
basic_syncbuf( streambuf_type* obuf, const Allocator& a); (3)
basic_syncbuf( basic_syncbuf&& rhs); (4)

1) Default constructor: creates an instance of std::basic_syncbuf with emit-on-sync
policy set to false, wrapped streambuffer set to nullptr, and using
default-constructed Allocator as the allocator for temporary storage.
2,3) 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.
4) 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.

Parameters¶

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

Exceptions¶

2,3) May throw std::bad_alloc from the constructor of the internal temporary storage
or std::system_error from the mutex construction.

Notes¶

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

Example¶

This section is incomplete
Reason: no example

See also¶

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