| 1 | // constexpr test for boost/core/bit.hpp (countl_zero, countl_one) |
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| 2 | // |
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| 3 | // Copyright 2023 Peter Dimov |
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| 4 | // Distributed under the Boost Software License, Version 1.0. |
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| 5 | // https://www.boost.org/LICENSE_1_0.txt |
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| 6 | |
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| 7 | #if defined(_MSC_VER) |
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| 8 | # pragma warning(disable: 4310) // cast truncates constant value |
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| 9 | #endif |
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| 10 | |
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| 11 | #include <boost/config.hpp> |
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| 12 | #include <boost/config/pragma_message.hpp> |
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| 13 | |
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| 14 | #if defined(BOOST_NO_CXX14_CONSTEXPR) |
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| 15 | |
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| 16 | BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_NO_CXX14_CONSTEXPR is defined" ) |
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| 17 | |
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| 18 | #elif defined(BOOST_MSVC) && BOOST_MSVC / 10 == 191 |
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| 19 | |
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| 20 | BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_MSVC is " BOOST_STRINGIZE(BOOST_MSVC) ) |
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| 21 | |
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| 22 | #else |
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| 23 | |
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| 24 | #include <boost/core/bit.hpp> |
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| 25 | #include <climits> |
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| 26 | |
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| 27 | #define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__) |
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| 28 | |
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| 29 | STATIC_ASSERT( boost::core::countl_zero( (unsigned char)0x1F ) == CHAR_BIT - 5 ); |
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| 30 | STATIC_ASSERT( boost::core::countl_zero( (unsigned short)0x1F ) == sizeof(unsigned short) * CHAR_BIT - 5 ); |
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| 31 | STATIC_ASSERT( boost::core::countl_zero( 0x1Fu ) == sizeof(unsigned int) * CHAR_BIT - 5 ); |
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| 32 | STATIC_ASSERT( boost::core::countl_zero( 0x1Ful ) == sizeof(unsigned long) * CHAR_BIT - 5 ); |
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| 33 | STATIC_ASSERT( boost::core::countl_zero( 0x1Full ) == sizeof(unsigned long long) * CHAR_BIT - 5 ); |
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| 34 | |
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| 35 | STATIC_ASSERT( boost::core::countl_one( (unsigned char)~0x1Fu ) == CHAR_BIT - 5 ); |
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| 36 | STATIC_ASSERT( boost::core::countl_one( (unsigned short)~0x1Fu ) == sizeof(unsigned short) * CHAR_BIT - 5 ); |
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| 37 | STATIC_ASSERT( boost::core::countl_one( ~0x1Fu ) == sizeof(unsigned int) * CHAR_BIT - 5 ); |
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| 38 | STATIC_ASSERT( boost::core::countl_one( ~0x1Ful ) == sizeof(unsigned long) * CHAR_BIT - 5 ); |
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| 39 | STATIC_ASSERT( boost::core::countl_one( ~0x1Full ) == sizeof(unsigned long long) * CHAR_BIT - 5 ); |
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| 40 | |
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| 41 | #endif |
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| 42 | |
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