On 30 mar, 10:06, ManicQin <Manic...@gmail.comwrote:
Hi, I've browsed the STL code a bit and stumble upon the next line (in
the operator << overload of both long and short outputs - the line is
for checking does the input is a manipulator)
long _Tmp = (_Bfl == ios_base::oct || _Bfl == ios_base::hex)
? (long)(unsigned short)_Val //<-This Line
: (long)_Val;
Is there any profound reason why they "Double" casting the _Val?
Not knowing the type of _Val, I can't say, but in general,
casting through an unsigned type guarantees a positive value in
the long (unless the positive value won't fit).
--
James Kanze (GABI Software) email:ja*********@gmail.com
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