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authorNat Goodspeed <nat@lindenlab.com>2019-10-15 23:06:04 -0400
committerNat Goodspeed <nat@lindenlab.com>2020-03-25 18:52:11 -0400
commitafaad3cef749e926cb63b6aed0c14f25d3495d55 (patch)
treea0b17319b7b477504b9c5a754db4f95b85c2ec77 /indra/test/blowfish.digits.txt
parent18e2b9ca8b5d4be0f1b92b464421693678cca0a0 (diff)
DRTVWR-476: Remove special case for listen(boost::bind(weak_ptr)).
LLEventDetail::visit_and_connect() promised special treatment for the specific case when an LLEventPump::listen() listener was composed of (possibly nested) boost::bind() objects storing boost::weak_ptr values -- specifically boost::bind() rather than std::bind or lambdas, specifically boost::weak_ptr rather than std::weak_ptr. Outside of self-tests, it does not appear that anyone actually uses that support. There is good reason not to: it's a silent side effect of a complicated compile-time inspection that could be silently derailed by use of std::bind() or a lambda or a std::weak_ptr. Can you be sure you've engaged that promise? How? A more robust guarantee can be achieved by storing an LLTempBoundConnection in the transient object itself. When the object is destroyed, the listener is disconnected. Normal C++ rules around object destruction guarantee it. This idiom is widely used. There are a couple good reasons to remove the visit_and_connect() machinery: * boost::bind() and boost::weak_ptr do not constitute the wave of the future. Preferring those constructs to lambdas and std::weak_ptr penalizes new code, whether by silently failing or by discouraging use of modern idioms. * The visit_and_connect() machinery was always complicated, and apparently never very robust. Most of its promised features have been commented out over the years. Making the code base simpler, clearer and more maintainable is always a useful effect. LLEventDetail::visit_and_connect() was also used by the four LLNotificationChannelBase::connectMumble() methods. Streamline those as well. Of course, remove related test code.
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