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c0ff9cffda
Ensure checked integers are in a sane state after a throw. Document that the value of the target operand is unspecified after a throw. Improve testing. Fixes https://github.com/boostorg/multiprecision/issues/626
83 lines
3.6 KiB
C++
83 lines
3.6 KiB
C++
///////////////////////////////////////////////////////////////
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// Copyright 2024 John Maddock. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
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#include <iostream>
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#include <boost/multiprecision/cpp_int.hpp>
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#include "test.hpp"
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template <class T>
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void test_neg_divide_by_zero(std::true_type const&)
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{
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T val = -42;
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BOOST_CHECK_THROW(static_cast<T>(val % 0), std::overflow_error);
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BOOST_CHECK_THROW(static_cast<T>(val % static_cast<T>(0)), std::overflow_error);
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BOOST_CHECK_THROW(static_cast<T>(val % static_cast<std::uintmax_t>(0)), std::overflow_error);
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BOOST_CHECK_THROW(static_cast<T>(val % static_cast<std::intmax_t>(0)), std::overflow_error);
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}
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template <class T>
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void test_neg_divide_by_zero(std::false_type const&)
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{
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}
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template <class T>
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void test_divide_by_zero()
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{
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T val = 42;
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BOOST_CHECK_THROW(static_cast<T>(val % 0), std::overflow_error);
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BOOST_CHECK_THROW(static_cast<T>(val % static_cast<T>(0)), std::overflow_error);
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BOOST_CHECK_THROW(static_cast<T>(val % static_cast<std::uintmax_t>(0)), std::overflow_error);
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BOOST_CHECK_THROW(static_cast<T>(val % static_cast<std::intmax_t>(0)), std::overflow_error);
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BOOST_IF_CONSTEXPR((std::numeric_limits<T>::digits < 500) && std::numeric_limits<T>::digits)
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{
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val <<= std::numeric_limits<T>::digits - 10;
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}
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else
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val <<= 500;
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BOOST_CHECK_THROW(static_cast<T>(val % 0), std::overflow_error);
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BOOST_CHECK_THROW(static_cast<T>(val % static_cast<T>(0)), std::overflow_error);
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BOOST_CHECK_THROW(static_cast<T>(val % static_cast<std::uintmax_t>(0)), std::overflow_error);
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BOOST_CHECK_THROW(static_cast<T>(val % static_cast<std::intmax_t>(0)), std::overflow_error);
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using tag_type = std::integral_constant<bool, std::numeric_limits<T>::is_signed>;
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test_neg_divide_by_zero<T>(tag_type());
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}
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int main()
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{
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using int64_t = boost::multiprecision::number<boost::multiprecision::cpp_int_backend<64, 64, boost::multiprecision::signed_magnitude>>;
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using uint64_t = boost::multiprecision::number<boost::multiprecision::cpp_int_backend<64, 64, boost::multiprecision::unsigned_magnitude>>;
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using checked_int64_t = boost::multiprecision::number<boost::multiprecision::cpp_int_backend<64, 64, boost::multiprecision::signed_magnitude, boost::multiprecision::checked>>;
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using checked_uint64_t = boost::multiprecision::number<boost::multiprecision::cpp_int_backend<64, 64, boost::multiprecision::unsigned_magnitude, boost::multiprecision::checked>>;
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test_divide_by_zero<int64_t>();
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test_divide_by_zero<boost::multiprecision::int128_t>();
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test_divide_by_zero<boost::multiprecision::int256_t>();
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test_divide_by_zero<boost::multiprecision::int1024_t>();
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test_divide_by_zero<uint64_t>();
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test_divide_by_zero<boost::multiprecision::uint128_t>();
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test_divide_by_zero<boost::multiprecision::uint256_t>();
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test_divide_by_zero<boost::multiprecision::uint1024_t>();
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test_divide_by_zero<checked_int64_t>();
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test_divide_by_zero<boost::multiprecision::checked_int128_t>();
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test_divide_by_zero<boost::multiprecision::checked_int256_t>();
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test_divide_by_zero<boost::multiprecision::checked_int1024_t>();
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test_divide_by_zero<uint64_t>();
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test_divide_by_zero<boost::multiprecision::checked_uint128_t>();
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test_divide_by_zero<boost::multiprecision::checked_uint256_t>();
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test_divide_by_zero<boost::multiprecision::checked_uint1024_t>();
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test_divide_by_zero<boost::multiprecision::cpp_int>();
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return boost::report_errors();
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}
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