URLStream sock; .... if (!sock) ---> ambiguous operator!() --> Socket/istream

[George Yohng]

When an URLStream is declared and one would want to check it against being 
valid with operator!, compiler error is issued.

conversion to bool works allright.

URLStream sock;

if (!sock) -----> fails during compilation

if (!(bool)sock) --------> works

One has to add this operator explicitly to URLStream, I guess.

Otherwise, lowercase tcpstream implements this operator, is it that there 
should be lowercase urlstream also?

Thanks,
George.


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