forked from boostorg/core
54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
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// Test for boost/core/bit.hpp (bit_floor)
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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_bit_floor( T x )
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{
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T y = boost::core::bit_floor( x );
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if( x == 0 )
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{
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BOOST_TEST_EQ( y, 0 );
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}
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else
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{
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BOOST_TEST( boost::core::has_single_bit( y ) );
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BOOST_TEST_LE( y, x );
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BOOST_TEST_GT( y, x >> 1 );
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}
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}
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int main()
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{
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{
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test_bit_floor( static_cast<unsigned char>( 0 ) );
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test_bit_floor( static_cast<unsigned short>( 0 ) );
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test_bit_floor( static_cast<unsigned int>( 0 ) );
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test_bit_floor( static_cast<unsigned long>( 0 ) );
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test_bit_floor( 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 < 1/*000*/; ++i )
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{
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boost::uint64_t x = rng();
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test_bit_floor( static_cast<unsigned char>( x ) );
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test_bit_floor( static_cast<unsigned short>( x ) );
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test_bit_floor( static_cast<unsigned int>( x ) );
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test_bit_floor( static_cast<unsigned long>( x ) );
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test_bit_floor( 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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