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## Class template ostream_ymd_formatter

boost::date_time::ostream_ymd_formatter — Convert ymd to a standard string formatting policies.

## Synopsis

    template<typename ymd_type, typename facet_type, typename charT = char>
    class ostream_ymd_formatter {
    public:
      // types
      typedef ymd_type::month_type                         month_type;
      typedef ostream_month_formatter< facet_type, charT > month_formatter_type;
      typedef std::basic_ostream< charT >                  ostream_type;
      typedef std::basic_string< charT >                   foo_type;

      // public static functions
      void ymd_put(ymd_type, ostream_type &, const facet_type &) ;
    };

## Description

### `ostream_ymd_formatter` public static functions

1.     void ymd_put(ymd_type ymd, ostream_type & os, const facet_type & f) ;

   This is standard code for handling date formatting with year-month-day based date information. This function uses the format_type to control whether the string will contain separator characters, and if so what the character will be. In addtion, it can format the month as either an integer or a string as controled by the formatting policy

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