NAME

       unicode::linebreak_callback_base, unicode::linebreak_callback_save_buf,
       unicode::linebreakc_callback_base, unicode::linebreak_iter, unicode::linebreakc_iter -
       unicode line-breaking rules

SYNOPSIS

       #include <courier-unicode.h>

       class linebreak : public unicode::linebreak_callback_base {

       public:

           using unicode::linebreak_callback_base::operator<<;
           using unicode::linebreak_callback_base::operator();
           int callback(int linebreak_code)
           {
               // ...
           }
       };

       char32_t c;
       std::u32string buf;

       linebreak compute_linebreak;

       compute_linebreak.set_opts(UNICODE_LB_OPT_SYBREAK);
       compute_linebreak << c;

       compute_linebreak(buf);
       compute_linebreak(buf.begin(), buf.end());

       compute_linebreak.finish();

       // ...

       unicode::linebreak_callback_save_buf linebreaks;

       std::list<int> lb=linebreaks.lb_buf;

       class linebreakc : public unicode::linebreakc_callback_base {

       public:

           using unicode::linebreak_callback_base::operator<<;
           using unicode::linebreak_callback_base::operator();
           int callback(int linebreak_code, char32_t ch)
           {
               // ...
           }
       };

       // ...

       std::u32string buf;

       typedef unicode::linebreak_iter<std::u32string::const_iterator> iter_t;

       iter_t beg_iter(buf.begin(), buf.end()), end_iter;

       beg_iter.set_opts(UNICODE_LB_OPT_SYBREAK);

       std::vector<int> linebreaks;

       std::copy(beg_iter, end_iter, std::back_insert_iterator<std::vector<int>>(linebreaks));

       // ...

       typedef unicode::linebreakc_iter<std::u32string::const_iterator> iter_t;

       iter_t beg_iter(buf.begin(), buf.end()), end_iter;

       beg_iter.set_opts(UNICODE_LB_OPT_SYBREAK);

       std::vector<std::pair<int, char32_t>> linebreaks;

       std::copy(beg_iter, end_iter, std::back_insert_iterator<std::vector<int>>(linebreaks));

DESCRIPTION

       unicode::linebreak_callback_base is a C++ binding for the unicode line-breaking rule
       implementation described in unicode_line_break(3).

       Subclass unicode::linebreak_callback_base and implement callback() that's virtually
       inherited from unicode::linebreak_callback_base. The callback() callback function receives
       the output values from the line-breaking algorithm, the UNICODE_LB_MANDATORY,
       UNICODE_LB_NONE, or the UNICODE_LB_ALLOWED value, for each unicode character.

       callback() should return 0. A non-zero return reports an error, that stops the
       line-breaking algorithm. See unicode_line_break(3) for more information.

       The alternate unicode::linebreakc_callback_base interface uses a virtually inherited
       callback() that receives two parameters, the line-break code value, and the corresponding
       unicode character.

       The input unicode characters for the line-breaking algorithm are provided by the <<
       operator, one unicode character at a time; or by the () operator, passing either a
       container, or a beginning and an ending iterator value for an input sequence of unicode
       characters.  finish() indicates the end of the unicode character sequence.

       set_opts sets line-breaking options (see unicode_lb_set_opts() for more information).

       unicode::linebreak_callback_save_buf is a subclass that implements callback() by saving
       the linebreaks codes into a std::list.

       The linebreak_iter template implements an input iterator over ints. The template parameter
       is an input iterator over unicode chars. The constructor's parameters are a beginning and
       an ending iterator value for a sequence of char32_t. This constructs the beginning
       iterator value for a sequence of ints consisting of line-break values
       (UNICODE_LB_MANDATORY, UNICODE_LB_NONE, or UNICODE_LB_ALLOWED) corresponding to each
       char32_t in the underlying sequence. The default constructor creates the ending iterator
       value for the sequence.

       The iterator implements a set_opts() methods that sets the options for the line-breaking
       algorithm.

       The linebreakc_iter template implements a similar input iterator, with the difference that
       it ends up iterating over a std::pair of line-breaking values and the corresponding
       char32_t from the underlying input sequence.

SEE ALSO

       courier-unicode(7), unicode_line_break(3).

AUTHOR

       Sam Varshavchik
           Author