Re: [Boost-users] [date_time] time_periodS subtraction

Igor R. wrote:

Hi,

As far as I see, the time_period class does not support any subtraction operation. Is it possible to add it to the "wishlist"? It would be very useful addition for the further releases of the library. I mean the following operation:

----[123456789)----- -----period1 -------[3456789abcdef)---period2 ---[0123456789abc)------perod3

period2 - period1: -----------------[abcdef)

period3 - period1: ---[0)----------[abc)

I'll stay out of the more general period discussion for now. So if I understand your request, the signature of operator- would look something like this: std::pair operator-(time_period p1, time_period p2); Right? And I guess in the case of period2 - period1 one of the return values would be a null interval? There's also another case where there's no intersection which I would assume would return the original interval? Looking at this I wouldn't have a problem adding it to the wishlist -- it looks useful. I'm unlikely to use operator- because it's a little too cute -- I'd prefer another name like remove_intersection that makes the function clearer. HTH, Jeff