2023-05-29 21:59:37 +03:00
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// constexpr test for boost/core/bit.hpp (countr_zero, countr_one)
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//
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// Copyright 2023 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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2023-05-30 02:56:37 +03:00
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#if defined(_MSC_VER)
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# pragma warning(disable: 4310) // cast truncates constant value
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#endif
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2023-05-29 21:59:37 +03:00
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#include <boost/config.hpp>
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#include <boost/config/pragma_message.hpp>
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#if defined(BOOST_NO_CXX14_CONSTEXPR)
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BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_NO_CXX14_CONSTEXPR is defined" )
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2023-05-30 02:56:37 +03:00
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#elif defined(BOOST_MSVC) && BOOST_MSVC / 10 == 191
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BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_MSVC is " BOOST_STRINGIZE(BOOST_MSVC) )
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2023-05-29 21:59:37 +03:00
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#else
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#include <boost/core/bit.hpp>
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#include <climits>
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#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
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STATIC_ASSERT( boost::core::countr_zero( (unsigned char)0xF8 ) == 3 );
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STATIC_ASSERT( boost::core::countr_zero( (unsigned short)0xF800 ) == 11 );
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STATIC_ASSERT( boost::core::countr_zero( 0xF80000u ) == 19 );
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STATIC_ASSERT( boost::core::countr_zero( 0xF8000000ul ) == 27 );
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STATIC_ASSERT( boost::core::countr_zero( 0xF800000000ull ) == 35 );
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STATIC_ASSERT( boost::core::countr_one( (unsigned char)~0xF8u ) == 3 );
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STATIC_ASSERT( boost::core::countr_one( (unsigned short)~0xF800u ) == 11 );
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STATIC_ASSERT( boost::core::countr_one( ~0xF80000u ) == 19 );
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STATIC_ASSERT( boost::core::countr_one( ~0xF8000000ul ) == 27 );
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STATIC_ASSERT( boost::core::countr_one( ~0xF800000000ull ) == 35 );
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#endif
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