~io_service();
On destruction, the io_service
performs the following
sequence of operations:
svc
in the io_service
set, in reverse order of the beginning of service object lifetime,
performs svc->shutdown_service()
.
io_service
,
or any associated strand, are destroyed.
svc
in the io_service
set, in reverse order of the beginning of service object lifetime,
performs delete static_cast<io_service::service*>(svc)
.
The destruction sequence described above permits programs to simplify their
resource management by using shared_ptr<>
. Where an object's lifetime is
tied to the lifetime of a connection (or some other sequence of asynchronous
operations), a shared_ptr
to the object would be bound into the handlers for all asynchronous operations
associated with it. This works as follows:
shared_ptr
references
to the objects are destroyed.
io_service
function stop()
is called to terminate any run()
calls as soon as possible. The io_service
destructor defined above destroys all handlers, causing all shared_ptr
references to all connection
objects to be destroyed.