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Function template operator<<

boost::logic::operator<< — Writes the indeterminate tribool value to a stream.


template<typename CharT, typename Traits> 
  std::basic_ostream< CharT, Traits > & 
  operator<<(std::basic_ostream< CharT, Traits > & out, unspecified);


This routine outputs either the integer value 2 (if (out.flags() & std::ios_base::boolalpha) == 0) or the name of the indeterminate value. The name of the indeterminate value comes from the indeterminate_name facet (if it is defined in the output stream's locale), or from the get_default_indeterminate_name function (if it is not defined in the locale or if the C++ standard library implementation does not support locales).