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133 lines
3.5 KiB
C++
133 lines
3.5 KiB
C++
// Copyright 2017, 2018, 2024, 2025 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/hash2/get_integral_result.hpp>
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#include <boost/hash2/fnv1a.hpp>
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#include <boost/core/lightweight_test.hpp>
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#include <cstdint>
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using boost::hash2::fnv1a_64;
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using boost::hash2::get_integral_result;
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template<class R> struct fnv1a_x: private fnv1a_64
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{
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using result_type = R;
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result_type result()
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{
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return get_integral_result<R>( static_cast<fnv1a_64&>( *this ) );
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}
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};
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int main()
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{
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// 1 -> 2
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{
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fnv1a_x<std::uint8_t> h1;
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std::uint16_t r1 = get_integral_result<std::int16_t>( h1 );
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fnv1a_x<std::uint8_t> h2;
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std::uint16_t r2 = 0;
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r2 += static_cast<std::uint16_t>( h2.result() ) << 0;
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r2 += static_cast<std::uint16_t>( h2.result() ) << 8;
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BOOST_TEST_EQ( static_cast<std::uint16_t>( r1 ), r2 );
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}
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// 1 -> 4
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{
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fnv1a_x<std::uint8_t> h1;
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std::uint32_t r1 = get_integral_result<std::int32_t>( h1 );
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fnv1a_x<std::uint8_t> h2;
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std::uint32_t r2 = 0;
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r2 += static_cast<std::uint32_t>( h2.result() ) << 0;
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r2 += static_cast<std::uint32_t>( h2.result() ) << 8;
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r2 += static_cast<std::uint32_t>( h2.result() ) << 16;
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r2 += static_cast<std::uint32_t>( h2.result() ) << 24;
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BOOST_TEST_EQ( static_cast<std::uint32_t>( r1 ), r2 );
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}
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// 1 -> 8
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{
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fnv1a_x<std::uint8_t> h1;
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std::uint64_t r1 = get_integral_result<std::int64_t>( h1 );
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fnv1a_x<std::uint8_t> h2;
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std::uint64_t r2 = 0;
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r2 += static_cast<std::uint64_t>( h2.result() ) << 0;
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r2 += static_cast<std::uint64_t>( h2.result() ) << 8;
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r2 += static_cast<std::uint64_t>( h2.result() ) << 16;
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r2 += static_cast<std::uint64_t>( h2.result() ) << 24;
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r2 += static_cast<std::uint64_t>( h2.result() ) << 32;
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r2 += static_cast<std::uint64_t>( h2.result() ) << 40;
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r2 += static_cast<std::uint64_t>( h2.result() ) << 48;
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r2 += static_cast<std::uint64_t>( h2.result() ) << 56;
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BOOST_TEST_EQ( static_cast<std::uint64_t>( r1 ), r2 );
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}
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// 2 -> 4
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{
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fnv1a_x<std::uint16_t> h1;
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std::uint32_t r1 = get_integral_result<std::int32_t>( h1 );
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fnv1a_x<std::uint16_t> h2;
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std::uint32_t r2 = 0;
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r2 += static_cast<std::uint32_t>( h2.result() ) << 0;
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r2 += static_cast<std::uint32_t>( h2.result() ) << 16;
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BOOST_TEST_EQ( static_cast<std::uint32_t>( r1 ), r2 );
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}
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// 2 -> 8
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{
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fnv1a_x<std::uint16_t> h1;
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std::uint64_t r1 = get_integral_result<std::int64_t>( h1 );
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fnv1a_x<std::uint16_t> h2;
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std::uint64_t r2 = 0;
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r2 += static_cast<std::uint64_t>( h2.result() ) << 0;
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r2 += static_cast<std::uint64_t>( h2.result() ) << 16;
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r2 += static_cast<std::uint64_t>( h2.result() ) << 32;
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r2 += static_cast<std::uint64_t>( h2.result() ) << 48;
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BOOST_TEST_EQ( static_cast<std::uint64_t>( r1 ), r2 );
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}
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// 4 -> 8
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{
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fnv1a_x<std::uint32_t> h1;
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std::uint64_t r1 = get_integral_result<std::int64_t>( h1 );
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fnv1a_x<std::uint32_t> h2;
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std::uint64_t r2 = 0;
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r2 += static_cast<std::uint64_t>( h2.result() ) << 0;
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r2 += static_cast<std::uint64_t>( h2.result() ) << 32;
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BOOST_TEST_EQ( static_cast<std::uint64_t>( r1 ), r2 );
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}
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return boost::report_errors();
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}
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