numeric overflow from cin

[anonimo]

Hello,

how can I filter numeric overflow exceptions from cin as in cin >> d,
where d is double?

Unfortunately, std::ios::failure that cin might throw when enabling
cin.exceptions does not garantuee that the error is related to overflows
necessarily

 

[Alf P. Steinbach /Usenet]

* anonimo, on 18.10.2010 02:18:

Hello,

how can I filter numeric overflow exceptions from cin as in cin >> d, where d is
double?

Unfortunately, std::ios::failure that cin might throw when enabling
cin.exceptions does not garantuee that the error is related to overflows
necessarily

The exception support in iostreams is just impractical.

There may be some way to do what you want without exceptions enabled (and if so
then probably James Kanze will chime in with a solution), but as a practical
matter, read in a line using std::getline from the <string> header, then parse
the spec using C library strtod, checking results as per the documentation.


Cheers & hth.,

- Alf