mirror of https://github.com/CGAL/cgal
269ae1ca61
bad() implies fail() but std::basic_ios::operator! is actually equivalent
to std::basic_ios::fail(), not bad().
For example,
std::ifstream is(argv[1]);
if (is.bad()) {
is probably wrong because, in case the file does not exist, only the failbit it set,
and not the badbit.
Other example:
double x;
is >> x;
If the stream 'is' does not contains a string that can represent a double,
then failbit is set (and maybe the eofbit if the stream is actually too
short), but not the badbit.
bad() can be used, in case fail() returned true, to discriminate between a
I/O error and a logical error.
See:
http://en.cppreference.com/w/cpp/io/basic_ios/operator_bool
http://en.cppreference.com/w/cpp/io/ios_base/iostate
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| Polynomial_kernel | ||