On Thu, 23 Oct 2014, John Peterson wrote: > OK, so you are saying this code > >> bool t = (is >> val); > > is legal? (FWIW, it works with g++ -std=c++11)
I believe it's legal in C++11. istringstream inherits operator>> from istream; that returns a reference-to-istream. That istream should then happily convert via its operator bool. I'm pretty sure about this. I believe it's also legal in C++03 - here the istream conversion operator goes to void*, and since I think it counts as a "user-defined conversion" you don't get any more implicit user-defined conversions... but then void* to bool is a "standard conversion sequence" so it doesn't break the "one implicit user-defined conversion at a time" rule. I'm much less sure about this. --- Roy ------------------------------------------------------------------------------ _______________________________________________ Libmesh-devel mailing list Libmesh-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libmesh-devel
