virtual long do_hash(char_type const *b,char_type const *e) const
{
string_type s(do_transform(b,e));
char const *begin = reinterpret_cast<char const *>(s.c_str());
char const *end = begin + s.size() * sizeof(char_type);
return gnu_gettext::pj_winberger_hash_function(begin,end);
}
///
/// This function is used to override default collation function that does not take in account collation level.
/// Uses primary level
///
virtual string_type do_transform(char_type const *b,char_type const *e) const
{
return do_transform(identical,b,e);
}
///
/// Create a binary string that can be compared to other in order to get collation order. The string is created
/// for text in range [b,e). It is useful for collation of multiple strings for text.
///
/// The transformation follows these rules:
/// \code
/// compare(level,b1,e1,b2,e2) == sign( transform(level,b1,e1).compare(transform(level,b2,e2)) );
/// \endcode
///
/// Calls do_transform
///
string_type transform(level_type level,char_type const *b,char_type const *e) const
{
return do_transform(level,b,e);
}
///
/// Create a binary string from string \a s, that can be compared to other, useful for collation of multiple
/// strings.
///
/// The transformation follows these rules:
/// \code
/// compare(level,s1,s2) == sign( transform(level,s1).compare(transform(level,s2)) );
/// \endcode
///
string_type transform(level_type level,string_type const &s) const
{
return do_transform(level,s.data(),s.data()+s.size());
}