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abacus: bignum: factorize lexicographical compare

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I want to make use of it for substraction.
This commit is contained in:
Bruno BELANYI 2021-08-20 18:44:30 +02:00
parent 6f7e1102db
commit d083ede78c
1 changed files with 12 additions and 3 deletions
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15
src/bignum/bignum.cc
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@ -9,6 +9,17 @@
namespace abacus::bignum {
using digits_type = std::vector<std::uint8_t>;
namespace {
bool do_less_than(digits_type const& lhs, digits_type const& rhs) {
return std::lexicographical_compare(lhs.rbegin(), lhs.rend(), rhs.rbegin(),
rhs.rend());
}
} // namespace
BigNum::BigNum(std::int64_t number) {
if (number == 0) {
return;
@ -68,9 +79,7 @@ bool BigNum::less_than(BigNum const& rhs) const {
return sign_ < rhs.sign_;
}
return std::lexicographical_compare(digits_.rbegin(), digits_.rend(),
rhs.digits_.rbegin(),
rhs.digits_.rend());
return do_less_than(digits_, rhs.digits_);
}
void BigNum::canonicalize() {