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///////////////////////////////////////////////////////////////
// Copyright 2024 John Maddock. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
#include <iostream>
#include <boost/multiprecision/cpp_int.hpp>
#include "test.hpp"
template <class T>
void test_subtract_underflow()
{
T val = 42;
int sub = 43;
BOOST_CHECK_THROW(static_cast<T>(val - sub), std::range_error);
BOOST_CHECK_THROW(static_cast<T>(val - static_cast<T>(sub)), std::range_error);
BOOST_CHECK_THROW(static_cast<T>(val - static_cast<std::uintmax_t>(sub)), std::range_error);
BOOST_CHECK_THROW(static_cast<T>(val - static_cast<std::intmax_t>(sub)), std::range_error);
BOOST_IF_CONSTEXPR((std::numeric_limits<T>::digits < 500) && std::numeric_limits<T>::digits)
{
val <<= std::numeric_limits<T>::digits - 10;
}
else
val <<= 500;
T sub2 = val + 1;
BOOST_CHECK_THROW(static_cast<T>(val - sub2), std::range_error);
}
template <unsigned int N>
void test_overflow() {
using uint_t = boost::multiprecision::number<boost::multiprecision::cpp_int_backend<N, N, boost::multiprecision::unsigned_magnitude, boost::multiprecision::cpp_int_check_type::checked, void>>;
uint_t value = (std::numeric_limits<uint_t>::max)();
BOOST_CHECK_THROW(value += 1, std::overflow_error);
//
// We don't care what the value is, but it must be sane and normalized
// to be within the range of the type under test:
//
BOOST_CHECK(value <= (std::numeric_limits<uint_t>::max)());
}
template <unsigned int N>
struct TestOverflow {
static void run() {
test_overflow<N>();
TestOverflow<N + 8>::run();
}
};
template <>
struct TestOverflow<1032> {
static void run() {}
};
int main()
{
using checked_uint64_t = boost::multiprecision::number<boost::multiprecision::cpp_int_backend<64, 64, boost::multiprecision::unsigned_magnitude, boost::multiprecision::checked>>;
test_subtract_underflow<checked_uint64_t>();
test_subtract_underflow<boost::multiprecision::checked_uint128_t>();
test_subtract_underflow<boost::multiprecision::checked_uint256_t>();
test_subtract_underflow<boost::multiprecision::checked_uint1024_t>();
TestOverflow<8>::run();
return boost::report_errors();
}
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