WHich one is evaluated first

[superbonzo]

No. If you insist otherwise, then be prepared: a standard library implementation that conforms to what is expected to be the next version of the C++ standard will cause your code snippet to fail to compile

Just to be more specific ( and to see if I got it right ), in the next standard implicit boolean conversions are treated as direct initializations of the boolean target ( that is "bool b(t);" and not "bool b = t;" ). For this reason that code * would compile with an explicit bool conversion function (laserlight, correct me if I'm wrong ).

*: I mean the "if( std::cin )" snippet