[boost] Re: more flexible lexical_cast

From: Gennaro Prota (gennaro_prota_at_[hidden])
Date: 2002-08-22 16:07:20

On Thu, 22 Aug 2002 22:50:19 +0200, Gennaro Prota
<gennaro_prota_at_[hidden]> wrote:

>---------------------
>#include <sstream>
>#include <iomanip>
>#include <iostream>
>
>
>// The value of str must be the
>// string representation of 1+LONG_MAX.
>// Change it for your machine if needed.
>//
>int main(int argc, char* argv)
>{
>    using namespace std;
>    
>    long num;
>    stringstream str;
>    str << "2147483648"; // 1+LONG_MAX
>    str >> num;
>    
>    cout << "fail()? " << boolalpha << (str.fail()) << '\n';
>    
>    
>    return 0;
>}
>----------------------------
>
>If you use 2+LONG_MAX instead then the stream is put in a failed
>state.

Ah! I forgot to say that if you experiment, for instance, with short
int and numeric_limits<short>::max() +1, +2, etc... the results are
even more surprising. This is related to core issue 23 and certainly
will need a fix when a resolution will be available from the C++
committee.

Genny.