| 1 | // Test for boost/core/bit.hpp (popcount) |
|---|---|
| 2 | // |
| 3 | // Copyright 2020 Peter Dimov |
| 4 | // Distributed under the Boost Software License, Version 1.0. |
| 5 | // https://www.boost.org/LICENSE_1_0.txt |
| 6 | |
| 7 | #include <boost/core/bit.hpp> |
| 8 | #include <boost/core/lightweight_test.hpp> |
| 9 | #include <boost/core/detail/splitmix64.hpp> |
| 10 | #include <boost/cstdint.hpp> |
| 11 | #include <limits> |
| 12 | #include <iostream> |
| 13 | |
| 14 | template<class T> void test_popcount( T x ) |
| 15 | { |
| 16 | int k = 0; |
| 17 | for( T y = x; y; y = static_cast<T>( y & (y - 1) ), ++k ); |
| 18 | |
| 19 | BOOST_TEST_EQ( boost::core::popcount( x ), k ) || ( std::cerr << "x: "<< +x << std::endl ); |
| 20 | } |
| 21 | |
| 22 | int main() |
| 23 | { |
| 24 | { |
| 25 | test_popcount( x: static_cast<unsigned char>( 0 ) ); |
| 26 | test_popcount( x: static_cast<unsigned short>( 0 ) ); |
| 27 | test_popcount( x: static_cast<unsigned int>( 0 ) ); |
| 28 | test_popcount( x: static_cast<unsigned long>( 0 ) ); |
| 29 | test_popcount( x: static_cast<boost::ulong_long_type>( 0 ) ); |
| 30 | } |
| 31 | |
| 32 | boost::detail::splitmix64 rng; |
| 33 | |
| 34 | for( int i = 0; i < 1000; ++i ) |
| 35 | { |
| 36 | boost::uint64_t x = rng(); |
| 37 | |
| 38 | test_popcount( x: static_cast<unsigned char>( x ) ); |
| 39 | test_popcount( x: static_cast<unsigned short>( x ) ); |
| 40 | test_popcount( x: static_cast<unsigned int>( x ) ); |
| 41 | test_popcount( x: static_cast<unsigned long>( x ) ); |
| 42 | test_popcount( x: static_cast<boost::ulong_long_type>( x ) ); |
| 43 | } |
| 44 | |
| 45 | return boost::report_errors(); |
| 46 | } |
| 47 |