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Enable endian_reverse_inplace for integral/enum/float/double

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This commit is contained in:
Peter Dimov
2020-05-03 03:22:21 +03:00
parent 8e617a69d1
commit 3e2890c243
2 changed files with 34 additions and 8 deletions
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35
include/boost/endian/detail/endian_reverse.hpp
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@ -1,10 +1,9 @@
#ifndef BOOST_ENDIAN_DETAIL_ENDIAN_REVERSE_HPP_INCLUDED
#define BOOST_ENDIAN_DETAIL_ENDIAN_REVERSE_HPP_INCLUDED
// Copyright 2019 Peter Dimov
//
// Copyright 2019, 2020 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/endian/detail/integral_by_size.hpp>
#include <boost/endian/detail/intrinsic.hpp>
@ -115,14 +114,14 @@ template<class T> struct is_endian_reversible: boost::integral_constant<bool,
// is_endian_reversible_inplace
template<class T> struct is_endian_reversible_inplace: boost::integral_constant<bool,
(boost::is_integral<T>::value && !boost::is_same<T, bool>::value) || is_scoped_enum<T>::value>
boost::is_integral<T>::value || boost::is_enum<T>::value || boost::is_same<T, float>::value || boost::is_same<T, double>::value>
{
};
} // namespace detail
// Requires:
// T is non-bool integral
// T is non-bool integral or scoped enumeration type
template<class T> inline BOOST_CONSTEXPR
typename enable_if_< !is_class<T>::value, T >::type
@ -135,10 +134,30 @@ template<class T> inline BOOST_CONSTEXPR
return static_cast<T>( detail::endian_reverse_impl( static_cast<uintN_t>( x ) ) );
}
template <class EndianReversible>
inline void endian_reverse_inplace(EndianReversible& x) BOOST_NOEXCEPT
// Requires:
// T is integral, enumeration, float or double
template<class T> inline
typename enable_if_< !is_class<T>::value >::type
endian_reverse_inplace( T & x ) BOOST_NOEXCEPT
{
BOOST_STATIC_ASSERT( detail::is_endian_reversible_inplace<T>::value );
typename detail::integral_by_size< sizeof(T) >::type x2;
std::memcpy( &x2, &x, sizeof(T) );
x2 = detail::endian_reverse_impl( x2 );
std::memcpy( &x, &x2, sizeof(T) );
}
// Default implementation for user-defined types
template<class T> inline
typename enable_if_< is_class<T>::value >::type
endian_reverse_inplace( T & x ) BOOST_NOEXCEPT
{
BOOST_STATIC_ASSERT( boost::is_class<EndianReversible>::value || detail::is_endian_reversible_inplace<EndianReversible>::value );
x = endian_reverse( x );
}

7
test/endian_reverse_test3.cpp
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@ -50,9 +50,16 @@ int main()
#endif
test_reverse_inplace( 1 );
test_reverse_inplace( true );
test_reverse_inplace( 1.0f );
test_reverse_inplace( 1.0 );
test_reverse_inplace( e1 );
#if !defined(BOOST_NO_CXX11_SCOPED_ENUMS)
test_reverse_inplace( e2 );
test_reverse_inplace( E3::e3 );
test_reverse_inplace( E4::e4 );