My code is below:

On 15 June 2010 15:26, Steve Lorimer <steve.lorimer@gmail.com> wrote:

I have made some progress, but am now getting unexpected results:

I have the following in my class:

   date_facet* fmt;

   mutable std::stringstream desig_stream;

and I do the following in my constructor:

   fmt(new date_facet);
   desig_stream.imbue(std::locale(std::locale::classic(), fmt));

at some point in my code I call

   fmt->format("%b %y"); // Mmm yy

and in my class's operator<<(ostream&...) I do the following:

   e.desig_stream.str("");

   e.desig_stream << e.desig;
   os << e.desig_stream.str();

because of the fact that I set the format to "%b %y", I would expect to see "Dec 10", instead, I'm getting "2010-Dec-01 00:00:00"

What must I change for my stringstream / date_facet objects to work together such that I can output a ptime object to a stream and obtain the expected format "%b %y"?

TIA
Steve

On 15 June 2010 14:38, Steve Lorimer <steve.lorimer@gmail.com> wrote:

Hi

I have a an object which contains a ptime and an int mask. The mask tells me that regardless of the value stored inside the ptime object, I should display the ptime as such.

If you look at the code below (set_fmt function), I set the format of a date_facet object according to some bitmasks.

I now want to use this date_facet together with my ptime to output the ptime value to an outputstream?

I don't want it to change the outputstream's settings for ALL ptime values, just for this single instance

All the examples use a date_facet allocated on the heap, and use std::cout.imbue(...), whereas I'm looking for functionality similar to strftime... is this possible?

eg:

class expiration

{
   enum expiry_mask
   {

   expiry_null = 0x00,
   expiry_year = 0x01,

   expiry_month = 0x02,
   expiry_day = 0x04,

   expiry_hour = 0x08,
   expiry_minute = 0x10,

   expiry_second = 0x20,
   expiry_date = 0x07, // yyyy/mm/dd

   expiry_time = 0x38, // hh:nn:ss

   expiry_all = 0x3f // yyyy/mm/dd hh:nn:ss
   };

boost::posix_time::ptime desig;

int32_t desig_mask;
boost::gregorian::date_facet fmt;

public:

void expiration::set_fmt(const int32_t mask)
{

   switch(mask & expiry_date) // strip off time part of mask
   {

   case expiry_null:
   fmt.format("");

   break;
   case expiry_year | expiry_month | expiry_day: // display as "dd Mmm yy"

   fmt.format("%d %b %y");
   break;

   case expiry_year | expiry_month: // display as "Mmm yy"

   fmt.format("%b %y");
   break;

   case expiry_year: // display as "yy"

   fmt.format("%y");
   break;

   default:
   break;

   }
}

... some other stuff here ...

};

Thanks
Steve