feedc0de/boost_integer
1
0
Fork 0
forked from boostorg/integer
Code Pull Requests Activity

Return integer with zero signaling common factor rather than boost::optional<Z>.

Browse Source
This commit is contained in:
Nick Thompson
2018-12-04 10:55:03 -07:00
parent cad4623876
commit 51b259da19
3 changed files with 16 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
test/mod_inverse_test.cpp
View File

@ -36,17 +36,17 @@ void test_mod_inverse()
for (Z a = 1; a < modulus; ++a)
{
Z gcdam = gcd(a, modulus);
boost::optional<Z> inv_a = mod_inverse(a, modulus);
Z inv_a = mod_inverse(a, modulus);
// Should fail if gcd(a, mod) != 1:
if (gcdam > 1)
{
BOOST_TEST(!inv_a);
BOOST_TEST(inv_a == 0);
}
else
{
BOOST_TEST(inv_a.value() > 0);
BOOST_TEST(inv_a > 0);
// Cast to a bigger type so the multiplication won't overflow.
int256_t a_inv = inv_a.value();
int256_t a_inv = inv_a;
int256_t big_a = a;
int256_t m = modulus;
int256_t outta_be_one = (a_inv*big_a) % m;