47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
// Test for boost/core/bit.hpp (countr_zero, countr_one)
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//
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// Copyright 2020 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/core/bit.hpp>
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#include <boost/core/lightweight_test.hpp>
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#include <boost/core/detail/splitmix64.hpp>
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#include <boost/cstdint.hpp>
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#include <limits>
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template<class T> void test_countr( T x )
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{
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x |= 1;
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for( int i = 0; i <= std::numeric_limits<T>::digits; ++i, x <<= 1 )
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{
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BOOST_TEST_EQ( boost::core::countr_zero( x ), i );
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BOOST_TEST_EQ( boost::core::countr_one( static_cast<T>( ~x ) ), i );
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}
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}
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int main()
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{
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test_countr( static_cast<unsigned char>( 0 ) );
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test_countr( static_cast<unsigned short>( 0 ) );
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test_countr( static_cast<unsigned int>( 0 ) );
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test_countr( static_cast<unsigned long>( 0 ) );
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test_countr( static_cast<unsigned long long>( 0 ) );
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boost::detail::splitmix64 rng;
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for( int i = 0; i < 1000; ++i )
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{
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boost::uint64_t x = rng();
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test_countr( static_cast<unsigned char>( x ) );
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test_countr( static_cast<unsigned short>( x ) );
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test_countr( static_cast<unsigned int>( x ) );
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test_countr( static_cast<unsigned long>( x ) );
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test_countr( static_cast<unsigned long long>( x ) );
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}
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return boost::report_errors();
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}
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