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53 lines
1.3 KiB
C++
53 lines
1.3 KiB
C++
// Copyright 2005-2009 Daniel James.
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// Copyright 2021 Peter Dimov.
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#include <boost/container_hash/hash.hpp>
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#include <boost/core/lightweight_test.hpp>
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#include <boost/core/type_name.hpp>
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#include <boost/type_traits/is_signed.hpp>
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#include <boost/type_traits/make_unsigned.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/config.hpp>
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// This test checks that values representable in a signed
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// and the corresponding unsigned type hash to the same value
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template<class T>
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void signed_unsigned_test()
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{
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BOOST_STATIC_ASSERT( boost::is_signed<T>::value );
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typedef typename boost::make_unsigned<T>::type U;
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T x = std::numeric_limits<T>::max();
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do
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{
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BOOST_TEST_EQ( boost::hash<T>()( x ), boost::hash<U>()( static_cast<U>( x ) ) );
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x /= 3;
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}
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while( x > 0 );
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}
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#define TEST(type) std::cerr << "Testing: " #type " (" << boost::core::type_name<type>() << ")\n"; signed_unsigned_test<type>();
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int main()
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{
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TEST(signed char)
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TEST(short)
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TEST(int)
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TEST(long)
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#if !defined(BOOST_NO_LONG_LONG)
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TEST(boost::long_long_type)
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#endif
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#if defined(BOOST_HAS_INT128)
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TEST(boost::int128_type)
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#endif
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return boost::report_errors();
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}
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