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Testing a boost::signal

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Simon Pickles

13 Jul 2008 13 Jul '08

10:53 a.m.

Hi, What is the correct syntax to test whether a signal has any slots connected? boost::signal sig; if (sig) DoSomething(); This doesn't compile. Thanks Simon

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Igor R

13 Jul 13 Jul

11:21 a.m.

if (!sig.empty()) doSomething(); But if you just want to "fire" your signal, you don't have to test its emptiness. 2008/7/13, Simon Pickles :

Hi,

What is the correct syntax to test whether a signal has any slots connected?

boost::signal sig;

if (sig) DoSomething();

This doesn't compile.

Thanks

Simon _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Frank Mori Hess

19 Jul 19 Jul

7:02 p.m.

On Sunday 13 July 2008 07:21, Igor R wrote:

if (!sig.empty()) doSomething();

But if you just want to "fire" your signal, you don't have to test its emptiness.

Actually, if you have a non-void return type for the signal, the default combiner (boost::last_value) requires a slot to be connected.

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Frank Mori Hess
Igor R
Simon Pickles