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// Test for boost/core/bit.hpp (popcount)
//
// Copyright 2020 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/core/bit.hpp>
#include <boost/core/lightweight_test.hpp>
#include <boost/core/detail/splitmix64.hpp>
#include <boost/cstdint.hpp>
#include <limits>
#include <iostream>
template<class T> void test_popcount( T x )
{
int k = 0;
for( T y = x; y; y = static_cast<T>( y & (y - 1) ), ++k );
BOOST_TEST_EQ( boost::core::popcount( x ), k ) || ( std::cerr << "x: " << +x << std::endl );
}
int main()
{
{
test_popcount( static_cast<unsigned char>( 0 ) );
test_popcount( static_cast<unsigned short>( 0 ) );
test_popcount( static_cast<unsigned int>( 0 ) );
test_popcount( static_cast<unsigned long>( 0 ) );
test_popcount( static_cast<boost::ulong_long_type>( 0 ) );
}
boost::detail::splitmix64 rng;
for( int i = 0; i < 1000; ++i )
{
boost::uint64_t x = rng();
test_popcount( static_cast<unsigned char>( x ) );
test_popcount( static_cast<unsigned short>( x ) );
test_popcount( static_cast<unsigned int>( x ) );
test_popcount( static_cast<unsigned long>( x ) );
test_popcount( static_cast<boost::ulong_long_type>( x ) );
}
return boost::report_errors();
}
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