MESSAGE
| DATE | 2016-11-16 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [Learn] ref use
|
From learn-bounces-at-nylxs.com Wed Nov 16 05:38:21 2016
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From: Ruben Safir
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Date: Wed, 16 Nov 2016 05:38:18 -0500
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Subject: [Learn] ref use
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[This mail was also posted to comp.lang.c++.]
I'm reading up on concurrency with the thread libraryis C++ Concurrency
in action by Anthony Williams and I'm puzzled by one example having to
do with sending references of objects through the threads. If you own
the text, it is one page 24 where he is callable functions is
void update_data_for_widget(widget_id w, widget_data& data);
the call for the thread is
std::thread t (update_data_for_widget, w, data); where data is an
object, of data I suppose ;)
to do this correctly he says we need to use ref and a reference wrapper
std::thread t(update_data_for_widget, w, std::ref(data) );
Why can't you just send a reference?
std::thread t(update_data_for_widget, w, &data );
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