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#include "testing/testing.hpp"
#include "routing/coding.hpp"
#include <cstdint>
#include <limits>
#include <type_traits>
using namespace routing;
namespace
{
template <typename T, typename ToDo>
void ForEachNumber(ToDo && toDo)
{
for (T number = std::numeric_limits<T>::min();; ++number)
{
toDo(number);
if (number == std::numeric_limits<T>::max())
break;
}
}
template <typename T>
void TestZigZag(T prev, T current)
{
auto const delta = EncodeZigZagDelta(prev, current);
auto const decodedCurrent = DecodeZigZagDelta(prev, delta);
TEST_EQUAL(decodedCurrent, current, ("prev:", prev, "delta:", delta));
}
template <typename T>
void TestZigZagUnsigned()
{
static_assert(std::is_unsigned<T>::value, "T should be an unsigned type");
constexpr auto max = std::numeric_limits<T>::max();
constexpr T values[] = {0, 1, 7, max / 2, max - 1, max};
for (T prev : values)
{
for (T current : values)
TestZigZag(prev, current);
}
}
template <typename T>
void TestZigZagSigned()
{
static_assert(std::is_signed<T>::value, "T should be a signed type");
constexpr auto min = std::numeric_limits<T>::min();
constexpr auto max = std::numeric_limits<T>::max();
constexpr T values[] = {min, min + 1, min / 2, -7, -1, 0, 1, 7, max / 2, max - 1, max};
for (T prev : values)
{
for (T current : values)
TestZigZag(prev, current);
}
}
} // namespace
namespace routing_test
{
UNIT_TEST(ModuleCastTest)
{
ForEachNumber<uint8_t>([](uint8_t number) {
auto signedNumber = ModularCast(number);
static_assert(std::is_same<decltype(signedNumber), int8_t>::value, "int8_t expected");
TEST_EQUAL(static_cast<uint8_t>(signedNumber), number, ("signedNumber:", signedNumber));
});
}
UNIT_TEST(ZigZagUint8)
{
ForEachNumber<uint8_t>([](uint8_t prev) {
ForEachNumber<uint8_t>([&](uint8_t current) { TestZigZag(prev, current); });
});
}
UNIT_TEST(ZigZagInt8)
{
ForEachNumber<int8_t>([](int8_t prev) {
ForEachNumber<int8_t>([&](int8_t current) { TestZigZag(prev, current); });
});
}
UNIT_TEST(ZigZagUint16) { TestZigZagUnsigned<uint16_t>(); }
UNIT_TEST(ZigZagInt16) { TestZigZagSigned<int16_t>(); }
UNIT_TEST(ZigZagUint32) { TestZigZagUnsigned<uint32_t>(); }
UNIT_TEST(ZigZagInt32) { TestZigZagSigned<int32_t>(); }
UNIT_TEST(ZigZagUint64) { TestZigZagUnsigned<uint64_t>(); }
UNIT_TEST(ZigZagInt64) { TestZigZagSigned<int64_t>(); }
} // namespace routing_test
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