constexpr inline intmax_t integer(const char *s) {
return (
*s == '+' ? +decimal_(s + 1) :
*s == '-' ? -decimal_(s + 1) :
decimal_(s)
);
}
constexpr inline intmax_t numeral(const char *s) {
return (
*s == '0' && *(s + 1) == 'X' ? hex_(s + 2) :
*s == '0' && *(s + 1) == 'x' ? hex_(s + 2) :
*s == '0' && *(s + 1) == 'B' ? binary_(s + 2) :
*s == '0' && *(s + 1) == 'b' ? binary_(s + 2) :
*s == '0' ? octal_(s + 1) :
*s == '+' ? +decimal_(s + 1) :
*s == '-' ? -decimal_(s + 1) :
decimal_(s)
);
}
Integer& Integer::operator-= (Integer b)
{
bool carry = 0;
std::vector<bool> result;
std::vector<bool> vec_a = bits_;
std::vector<bool> vec_b = b.bits_;
//If b is larger than a, swap, so that this function only returns absolute value of result
if (decimal_() < b.decimal_()) {
std::swap(vec_a, vec_b);
}
//Equalize size of vectors by adding leading zeroes
equalize_(vec_a, vec_b);
for (int i = static_cast<int>(vec_b.size()) - 1; i >= 0; --i) {
//Compare digits:
//0 - 0 = 0 (!carry) -
//0 - 0 = 1 (carry) -
//0 - 1 = 1 (!carry)
//0 - 1 = 0 (carry)
//1 - 0 = 1 (!carry)
//1 - 0 = 0 (carry)
//1 - 1 = 0 (!carry) -
//1 - 1 = 1 (carry) -
result.insert(result.begin(), (((vec_a[i] == vec_b[i]) == carry) || ((!vec_a[i] && vec_b[i]) && !carry) || ((vec_a[i] && !vec_b[i]) && !carry)));
//Carry if digits equal AND carry from last digit, or carry if 0 - 1 and no carry
carry = (((vec_a[i] == vec_b[i]) && carry) || (!vec_a[i] && vec_b[i]));
}
if (carry) {
result.insert(result.begin(), 1);
}
bits_ = result;
return *this;
}
constexpr inline uintmax_t decimal(const char *s) {
return (
decimal_(s)
);
}
constexpr inline uintmax_t decimal_(const char *s, uintmax_t sum = 0) {
return (
*s >= '0' && *s <= '9' ? decimal_(s + 1, (sum * 10) + *s - '0') :
sum
);
}
std::string Integer::decimal_string()
{
return std::to_string(decimal_());
}
