cpp-bignumber/include/math/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};
// 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);
data_type divide(data_type & remainder, data_type const & divisor);
}}