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#if 0
cc=${CC:-g++}
bin="$(mktemp)"
${cc} -x c++ -std=c++20 -o "$bin" "$(realpath $0)"
"$bin"
exit 0
#endif
#include "zmodn.h"
#include <concepts>
#include <functional>
#include <iostream>
#include <optional>
template<typename S, typename T>
requires std::convertible_to<S, T> || std::convertible_to<T, S>
void assert_equal(S actual, T expected) {
if (actual != expected) {
std::cout << "Error!" << std::endl;
std::cout << "Expected: " << expected << std::endl;
std::cout << "But got: " << actual << std::endl;
exit(1);
}
}
class Test {
public:
std::string name;
std::function<void()> f;
} tests[] = {
{
.name = "Constructor 2 mod 3",
.f = []() {
Zmod<3> two = Zmod<3>(2);
assert_equal(two.toint(), INT64_C(2));
}
},
{
.name = "Constructor -7 mod 3",
.f = []() {
Zmod<3> z = -7;
assert_equal(z, Zmod<3>(2));
}
},
{
.name = "1+1 mod 2",
.f = []() {
auto oneplusone = Zmod<2>(1) + Zmod<2>(1);
assert_equal(oneplusone, Zmod<2>(0));
}
},
{
.name = "2 -= 5 (mod 4)",
.f = []() {
Zmod<4> z = 2;
auto diff = (z -= 5);
assert_equal(z, Zmod<4>(1));
assert_equal(diff, Zmod<4>(1));
}
},
{
.name = "Inverse of 0 mod 2",
.f = []() {
Zmod<2> z = 0;
auto inv = z.inverse();
assert_equal(inv.has_value(), false);
}
},
{
.name = "Inverse of 1 mod 2",
.f = []() {
Zmod<2> z = 1;
auto inv = z.inverse();
assert_equal(inv.has_value(), true);
assert_equal(inv.value(), Zmod<2>(1));
}
},
{
.name = "Inverse of 5 mod 7",
.f = []() {
Zmod<7> z = 5;
auto inv = z.inverse();
assert_equal(inv.has_value(), true);
assert_equal(inv.value(), Zmod<7>(3));
}
},
{
.name = "Inverse of 4 mod 12",
.f = []() {
Zmod<12> z = 4;
auto inv = z.inverse();
assert_equal(inv.has_value(), false);
}
},
{
.name = "4 / 7 (mod 12)",
.f = []() {
Zmod<12> n = 4;
Zmod<12> d = 7;
auto inv = n / d;
assert_equal(inv.has_value(), true);
assert_equal(inv.value(), Zmod<12>(4));
}
},
{
.name = "4 /= 7 (mod 12)",
.f = []() {
Zmod<12> n = 4;
Zmod<12> d = 7;
auto inv = (n /= d);
assert_equal(inv.has_value(), true);
assert_equal(inv.value(), Zmod<12>(4));
assert_equal(n, Zmod<12>(4));
}
},
{
.name = "Multiplication overflow",
.f = []() {
Zmod<10> n = 8;
Zmod<10> m = 9;
auto prod = m * n;
assert_equal(prod.toint(), 2);
}
},
{
.name = "Multiplication and assignment overflow",
.f = []() {
Zmod<10> n = 8;
Zmod<10> m = 9;
n *= m;
assert_equal(n.toint(), 2);
}
},
{
.name = "2^12 mod 154",
.f = []() {
Zmod<154> b = 2;
auto p = b ^ 12;
assert_equal(p, 92);
}
},
{
.name = "4 / 2 mod 6",
.f = []() {
Zmod<6> four = 4;
Zmod<6> two = 2;
auto d = four / two;
assert_equal(d.has_value(), true);
assert_equal(d.value(), 2);
}
},
};
int main() {
for (auto t : tests) {
std::cout << t.name << ": ";
t.f();
std::cout << "OK" << std::endl;
}
std::cout << "All tests passed" << std::endl;
return 0;
}
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