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introduced alert_cast

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This commit is contained in:
Arvid Norberg
2009-11-02 03:34:16 +00:00
parent 67c8eace2c
commit fade413665
3 changed files with 31 additions and 11 deletions
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15
docs/manual.rst
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@@ -2663,14 +2663,14 @@ Example code to pause and save resume data for all torrents and wait for the ale
std::auto_ptr<alert> holder = ses.pop_alert();
if (dynamic_cast<save_resume_data_failed_alert const*>(a))
if (alert_cast<save_resume_data_failed_alert>(a))
{
process_alert(a);
--num_resume_data;
continue;
}
save_resume_data_alert const* rd = dynamic_cast<save_resume_data_alert const*>(a);
save_resume_data_alert const* rd = alert_cast<save_resume_data_alert>(a);
if (rd == 0)
{
process_alert(a);
@@ -4687,9 +4687,14 @@ Every alert belongs to one or more category. There is a small cost involved in p
alerts that belong to an enabled category are posted. Setting the alert bitmask to 0 will disable
all alerts
When you get an alert, you can use ``typeid()`` or ``dynamic_cast<>`` to get more detailed
information on exactly which type it is. i.e. what kind of error it is. You can also use a
dispatcher_ mechanism that's available in libtorrent.
When you get an alert, you can use ``alert_cast<>`` to attempt to cast the pointer to a
more specific alert type, to be queried for more information about the alert. ``alert_cast``
has the followinf signature::
template <T> T* alert_cast(alert* a);
template <T> T const* alert_cast(alert const* a);
You can also use a dispatcher_ mechanism that's available in libtorrent.
All alert types are defined in the ``<libtorrent/alert_types.hpp>`` header file.