Hello,
What should the expected output be for:
void bar(void) { }
sigc::slot<void> foo = sigc::ptr_fun(&bar);
foo = sigc::slot<void>();
std::cout << bool(foo) << std::endl;
?
I get "1" (using MSVC 2008 with libsigc++ 2.2.4.2), which surprised me.
sigc::slot_base::empty() also returns true in this case. Is this subtle
distinction intentional? The documentation for operator bool says:
"Tests whether a slot is null, because the default constructor was used."
On one hand, I didn't initialize the slot with the default constructor
(although I did assign over it with a default-constructed slot). On the other
hand, I think it qualifies as a "null slot".
Thanks,
- James
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