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42 lines
1.7 KiB
C++
42 lines
1.7 KiB
C++
// constexpr test for boost/core/bit.hpp (countl_zero, countl_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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#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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#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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#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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#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::countl_zero( (unsigned char)0x1F ) == CHAR_BIT - 5 );
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STATIC_ASSERT( boost::core::countl_zero( (unsigned short)0x1F ) == sizeof(unsigned short) * CHAR_BIT - 5 );
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STATIC_ASSERT( boost::core::countl_zero( 0x1Fu ) == sizeof(unsigned int) * CHAR_BIT - 5 );
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STATIC_ASSERT( boost::core::countl_zero( 0x1Ful ) == sizeof(unsigned long) * CHAR_BIT - 5 );
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STATIC_ASSERT( boost::core::countl_zero( 0x1Full ) == sizeof(unsigned long long) * CHAR_BIT - 5 );
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STATIC_ASSERT( boost::core::countl_one( (unsigned char)~0x1Fu ) == CHAR_BIT - 5 );
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STATIC_ASSERT( boost::core::countl_one( (unsigned short)~0x1Fu ) == sizeof(unsigned short) * CHAR_BIT - 5 );
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STATIC_ASSERT( boost::core::countl_one( ~0x1Fu ) == sizeof(unsigned int) * CHAR_BIT - 5 );
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STATIC_ASSERT( boost::core::countl_one( ~0x1Ful ) == sizeof(unsigned long) * CHAR_BIT - 5 );
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STATIC_ASSERT( boost::core::countl_one( ~0x1Full ) == sizeof(unsigned long long) * CHAR_BIT - 5 );
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#endif
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