From 2e29dea2b6c946466ce3b2c9f56593acf7156bb2 Mon Sep 17 00:00:00 2001
From: Bruno BELANYI <bruno@belanyi.fr>
Date: Wed, 6 Dec 2023 11:54:21 +0000
Subject: [PATCH] abacus: bignum: use base to compute complement

Instead of hard-coding 9 for base-10 computations.
---
 src/bignum/bignum.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/bignum/bignum.cc b/src/bignum/bignum.cc
index 3fce460..f38159f 100644
--- a/src/bignum/bignum.cc
+++ b/src/bignum/bignum.cc
@@ -107,7 +107,7 @@ digits_type do_substraction(digits_type const& lhs, digits_type const& rhs) {
     assert(!do_less_than(lhs, rhs));
 
     digits_type complement;
-    auto const take_complement = [](auto num) { return 9 - num; };
+    auto const take_complement = [](auto num) { return BASE - 1 - num; };
     std::transform(lhs.begin(), lhs.end(), std::back_inserter(complement),
                    take_complement);