Re: [boost] [date_time] [#1861] Change for the default duration format

Subject: Re: [boost] [date_time] [#1861] Change for the default duration format
From: Ilya Bobir (ilya.bobir_at_[hidden])
Date: 2009-06-17 19:38:52

Rutger ter Borg wrote:
> Andrey Semashev wrote:
>> What exactly is wrong?
>>
> 
> Streaming of a time duration is broken; IMHO the snippet below shouldn't be 
> asserted on. To make things consistent, alternatives could be to impose a 
> limit of 100 hours in the concept of a time duration, to introduce a 
> limited_time_duration concept, to follow ISO 8601, or to allow more than 99 
> hours.
> 
> 
> time_duration a = hours( 10 );   // OK
> std::cout << a << std::endl;     // OK
> 
> time_duration b = hours( 100 );  // OK
> std::cout << b << std::endl;     // Assertion failure

The assertion is there because the default time duration format is 
"%H:%M:%S".  This is exactly what I'm proposing to change.  I think it 
should be "%O:%M:%S" thus imposing no restrictions on the hours field of 
a time duration.

Actually, I can not find a notion of a limited time duration in ISO 
8601-2004.  Instead the third paragraph of section 4.4.3.2 says the 
following:

 > In these representations the maximum number of digits in a component
 > needs to be agreed by the partners in information interchange.

Suggesting that time durations may have variable number of digits for 
all fields.