cpp-bignumber/include/bignum_helper.h

//
//  bignum_helper.h
//  bigdecimal
//
//  Created by Sam Jaffe on 7/4/17.
//

#pragma once

#include <vector>

namespace math { namespace detail {
  using data_type = std::vector<int32_t>;
  constexpr const int32_t powers[] = { 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000 };
  // 1 => GREATER, 0 => EQUAL, -1 => LESS
  int compare(data_type const & rhs, data_type const & lhs, size_t offset = 0);
  void add(data_type & rhs, data_type const & lhs, size_t offset = 0);
  void subtract_nounderflow(data_type & rhs, data_type const & lhs, size_t offset = 0);
  void multiply(data_type & rhs, data_type const & lhs, size_t offset = 0);
  data_type divide(data_type & remainder, data_type const & divisor);
  data_type shift10(data_type const & data, int32_t places);
} }