boost::text::v1::estimated_width_of_graphemes
// In header: <boost/text/estimated_width.hpp> template<code_point_iter I, std::sentinel_for< I > S> std::size_t estimated_width_of_graphemes(I first, S last);
Returns the estimated width of the graphemes within [first, last), using the same technique that used by std::format().
[first, last)
std::format()
See Also:
[format.string.std] for a full description