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Add bit_ceil

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This commit is contained in:
Peter Dimov
2020-12-29 00:29:44 +02:00
parent 3e41929dfb
commit 26728848b4
3 changed files with 127 additions and 3 deletions
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65
test/bit_ceil_test.cpp Normal file
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// Test for boost/core/bit.hpp (bit_ceil)
//
// 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>
template<class T> void test_bit_ceil( T x )
{
if( !boost::core::has_single_bit( x ) )
{
x >>= 1;
}
T y = boost::core::bit_ceil( x );
if( x == 0 )
{
BOOST_TEST_EQ( y, 0 );
}
else
{
BOOST_TEST( boost::core::has_single_bit( y ) );
BOOST_TEST_GE( +y, +x );
BOOST_TEST_LT( y >> 1, +x );
}
}
int main()
{
{
test_bit_ceil( static_cast<unsigned char>( 0 ) );
test_bit_ceil( static_cast<unsigned short>( 0 ) );
test_bit_ceil( static_cast<unsigned int>( 0 ) );
test_bit_ceil( static_cast<unsigned long>( 0 ) );
test_bit_ceil( static_cast<unsigned long long>( 0 ) );
}
{
test_bit_ceil( static_cast<boost::uint8_t>( 0x80 ) );
test_bit_ceil( static_cast<boost::uint16_t>( 0x8000 ) );
test_bit_ceil( static_cast<boost::uint32_t>( 0x80000000 ) );
test_bit_ceil( static_cast<boost::uint64_t>( 0x8000000000000000 ) );
}
boost::detail::splitmix64 rng;
for( int i = 0; i < 1000; ++i )
{
boost::uint64_t x = rng();
test_bit_ceil( static_cast<unsigned char>( x ) );
test_bit_ceil( static_cast<unsigned short>( x ) );
test_bit_ceil( static_cast<unsigned int>( x ) );
test_bit_ceil( static_cast<unsigned long>( x ) );
test_bit_ceil( static_cast<unsigned long long>( x ) );
}
return boost::report_errors();
}