PluginFactoryBase::make_return problem with longs

[andresailer]

DD4hep/DDCore/include/DD4hep/Plugins.h

Lines 145 to 148 in bec0603

	namespace dd4hep {
	template <> inline long PluginFactoryBase::make_return(const long& value)
	{ static long stored=value; return (long)&stored; }
	}

As long is only at least 32 bits, and I am using a 64 bit system, this casting to long is going to not allow one to retrieve the value of the long because the ptr address will be a bit random, right?
Instead return a long*?

[MarkusFrankATcernch]

On all "reasonable" OSes, sizeof(long) == sizeof(void*).
A pointer always fits into a long, because in the OS kernel typically longs are used.....

[andresailer]

OK true.
But then I don't understand why I still don't get the return value of my plugin and just 1 instead of 42.

[andresailer]

Testing with the plugins in DD4hep, I get the correct result value out of the plugins. Doing this in key4hep/k4ActsTracking#3 which also includes Gaudi (maybe related) I always get back 1,