Converting a stream of bytes to a string of hex with C++

ByteStreamToHexString.cpp

#include <iostream>
#include <sstream>
#include <iomanip>
#include <iterator>

template<typename T, int Width>
struct fixed_width_t
{
	fixed_width_t(T val) : val{ val } {}
	T val;
};

template <typename CharT, typename T, int Width>
auto& operator<<(std::basic_ostream<CharT>& out, const fixed_width_t<T, Width> &fixed_width_val)
{
	return out << std::setw(Width) << fixed_width_val.val;
}

template<typename CharT>
auto HexPrinter(std::basic_ostream<CharT>& stream)
{
	stream << std::hex << std::setfill(stream.widen('0'));
	return std::ostream_iterator<fixed_width_t<int, 2>, CharT>(stream);
}

template<typename CharT, typename Cont>
auto ByteStreamToHexString(const Cont& buffer)
{
	std::basic_ostringstream<CharT> result{};
	std::copy(std::begin(buffer), std::end(buffer), HexPrinter(result));
	return result.str();
}

#include <vector>
int main(int argc, char* argv[])
{
	std::cout << ByteStreamToHexString<char>(std::vector<char>(16, 0)) << std::endl;
}