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without this it wasn't possible to construct a Slot returning void from functors returning some
real value because the compiler would complain about "return statement with a value in a function
returning void".
Theoretically, this may produce some unexpected type conversions, because static_cast is slightly
stronger than implicit cast, but I judge the risk to be negligable (the alternative would be to
provide explicit specializations for slots returning void - too much typing)
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Added some polish around them and, to mark this special occasion, moved them out of the SigImpl
namespace.
PS: This partially reverts commit 0775350fee345e37fb59835dda4d85664346b606, since I had to
reintroduce ReturnType template parameter, because it will be used in lua. But Signal classes
remain without the ReturnType, because I still cannot imagine how would it be used.
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- merged all the common stuff from 0,1,2,3 argument versions into one common base class
- removed ReturnType template parameter as it was instantiated with "void" everywhere and the
current ignores the return value of the callbacks anyway
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Replace CallbackHolder, FunctorHolder and SlotHolder with a (smaller) set of polymorphic classes.
SignalHolder now stores a (smart) pointer to the class.
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This is suppose to replace the obsolete Subject/Observer classes.
See the src/tests/testSignals.cc for basic usage.
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