C++ to base64

to_base64.cpp

#include <boost/archive/iterators/binary_from_base64.hpp>
#include <boost/archive/iterators/base64_from_binary.hpp>
#include <boost/archive/iterators/transform_width.hpp>

#include <utility>
#include <memory>
#include <string>
#include <vector>

std::string to_base64(const std::vector<uint8_t>& buffer) {
    using namespace boost::archive::iterators;
    using It = base64_from_binary<transform_width<std::vector<unsigned char>::const_iterator, 6, 8>>;
    auto base64 = std::string(It(buffer.begin()), It(buffer.end()));
    return base64.append((3 - buffer.size() % 3) % 3, '=');
}