...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::algorithm::hex_lower — Converts a sequence of integral types into a lower case hexadecimal sequence of characters.
// In header: <boost/algorithm/hex.hpp> template<typename Range, typename OutputIterator> unspecified hex_lower(const Range & r, OutputIterator out);