Helpers for getting and setting bit ranges

bit_get_set.cpp

#include <cstdint>

namespace {
template <int hi, int lo>
constexpr uint32_t mask() {
  // hi_mask xor lo_mask
  return ((1u << hi) | ((1u << hi) - 1u)) ^ ((1u << lo) - 1u);
}

template <int hi, int lo>
void set(uint32_t &out, const uint32_t in) {
  out &= ~mask<hi, lo>();
  out |= (in << lo) & mask<hi, lo>();
}

template <int hi, int lo>
void get(const uint32_t in, uint32_t &out) {
  out = (in & mask<hi, lo>()) >> lo;
}
} // namespace {}