47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
// Test for boost/core/bit.hpp (bit_ceil)
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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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#include <iostream>
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template<class T> void test_popcount( T x )
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{
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int k = 0;
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for( T y = x; y; y &= y - 1, ++k );
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BOOST_TEST_EQ( boost::core::popcount( x ), k ) || ( std::cerr << "x: " << +x << std::endl );
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}
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int main()
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{
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{
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test_popcount( static_cast<unsigned char>( 0 ) );
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test_popcount( static_cast<unsigned short>( 0 ) );
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test_popcount( static_cast<unsigned int>( 0 ) );
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test_popcount( static_cast<unsigned long>( 0 ) );
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test_popcount( static_cast<unsigned long long>( 0 ) );
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}
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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_popcount( static_cast<unsigned char>( x ) );
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test_popcount( static_cast<unsigned short>( x ) );
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test_popcount( static_cast<unsigned int>( x ) );
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test_popcount( static_cast<unsigned long>( x ) );
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test_popcount( 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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