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Change bit_width to return int, LWG3656 has been applied as a DR to C++20

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Peter Dimov
2022-09-22 01:31:01 +03:00
parent 013c7856ce
commit b407b5d87d
2 changed files with 6 additions and 6 deletions
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8
include/boost/core/bit.hpp
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@@ -468,15 +468,15 @@ BOOST_CONSTEXPR bool has_single_bit( T x ) BOOST_NOEXCEPT
return x != 0 && ( x & ( x - 1 ) ) == 0;
}
// bit_width should return int, https://cplusplus.github.io/LWG/issue3656
// bit_width returns `int` now, https://cplusplus.github.io/LWG/issue3656
// has been applied to C++20 as a DR
template<class T>
BOOST_CONSTEXPR T bit_width( T x ) BOOST_NOEXCEPT
BOOST_CONSTEXPR int bit_width( T x ) BOOST_NOEXCEPT
{
BOOST_STATIC_ASSERT( std::numeric_limits<T>::is_integer && !std::numeric_limits<T>::is_signed );
return static_cast<T>(
std::numeric_limits<T>::digits - boost::core::countl_zero( x ) );
return std::numeric_limits<T>::digits - boost::core::countl_zero( x );
}
template<class T>