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## Function template operator<<

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

## Synopsis

    // In header: <boost/logic/tribool_io.hpp>

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

## Description

When the value of `x` is either `true` or `false`, this routine is semantically equivalent to:

     out << static_cast<bool>(x);

When `x` has an indeterminate value, it 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).

Returns: | `out`