id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
11177	signals2 does not allow reference return values for a slot	Peter Brockamp <peter.brockamp@…>	Frank Mori Hess	"As can easily be tested it is not possible to declare a slot with a reference as a return value:

{{{
#!cpp
#include ""boost\signals2.hpp""

void f()
{
	boost::signals2::signal<int* ()> pTest;
	boost::signals2::signal<int& ()> rTest;

	int* p = *pTest(); // OK
	//int& r = *rTest(); // C2528 on Visual Studio
}
}}}

I do understand what is causing the compiler error (pointer to reference is illegal) and that this is due to the implementation trying to store a pointer to the return value object.

Of course this could be worked around by using pointers instead of references (see above example). Nevertheless I think it would be helpful (and make a slot operate more general/generic) if a return type could also be a reference. The question is: Could this be done (didn't take an in-depth look inside the code, as usual there's a lot of macro magic and things behind the scenes)?

At least for the enduser there's no apparent reason why this should be prohibited and in case of a given library the current situation enforces additional boiler plate code. Maybe the maintainer of signals2 could give a statement about how he rates the status quo?

Thx

Peter
"	Bugs	closed	To Be Determined	signals2	Boost 1.57.0	Problem	fixed	slot return reference