Boost C++ Libraries: Ticket #13280: "20170101" gives surprising result parsed as extended ISO 8601

Mon, 30 Oct 2017 17:05:49 GMT

Apologies - version should be 1.65.1

version changed

James E. King, III — Thu, 21 Dec 2017 14:24:39 GMT

version Boost 1.63.0 → Boost 1.65.0

owner changed

James E. King, III — Thu, 21 Dec 2017 15:53:17 GMT

owner changed from az_sw_dude to James E. King, III

status changed; resolution set

James E. King, III — Thu, 21 Dec 2017 16:06:35 GMT

status new → closed
resolution → worksforme

I just added this test to testdate_input_facet and using Boost 1.66.0 with msvc-14.1 it works properly. You did not enable exceptions in your example. Before calling imbue, you want to call:

    ss.exceptions(std::ios_base::failbit); // turn on exceptions

if you want an exception to be raised.

Example (add this to the testdate_input_facet unit test to see it work):

  // prove trac 13280 on extended iso format is behaving properly
  {
    std::string value = "20171221";
    date_input_facet *f13280_bad = new date_input_facet();
    f13280_bad->set_iso_extended_format();
    std::stringstream s13280_bad;
    s13280_bad.imbue(std::locale(s13280_bad.getloc(), f13280_bad));
    s13280_bad << value;
    boost::gregorian::date d13280_bad;
    check("extended ISO with YYYYMMDD sets failbit",
          failure_test(d13280_bad, value, f13280_bad));
    check("extended iso with YYYYMMDD is not a date",
          d13280_bad.is_not_a_date());
  }

James E. King, III — Thu, 21 Dec 2017 20:01:35 GMT

The documentation is clear on this one as well:

http://www.boost.org/doc/libs/1_66_0/doc/html/date_time/date_time_io.html

Exception Handling on Streams
When an error occurs during the input streaming process, the std::ios_base::failbit
will (always) be set on the stream. It is also possible to have exceptions thrown
when an error occurs. To "turn on" these exceptions, call the stream's exceptions
function with a parameter of std::ios_base::failbit.