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float showing signs of life.

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Beman
2013-05-11 08:13:55 -04:00
parent e4d65805a6
commit 9e96faf4c1
3 changed files with 21 additions and 14 deletions
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24
include/boost/endian/converters.hpp
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@@ -13,6 +13,7 @@
#include <boost/cstdint.hpp>
#include <boost/endian/detail/intrinsic.hpp>
#include <boost/detail/scoped_enum_emulation.hpp>
#include <boost/static_assert.hpp>
#include <algorithm>
//------------------------------------- synopsis ---------------------------------------//
@@ -37,14 +38,9 @@ namespace endian
// reverse_bytes overloads for floating point types as requested by Vicente
// Botet and others.
// TODO: Need implementation
// TODO: Need to verify the return does not invoke undefined behavior (as might happen
// if there are unutterable floating point values, such as happens with the unutterable
// pointer values that cause an immediate abort on some legacy architectures
// TODO: Track progress of Floating-Point Typedefs Having Specified Widths proposal (N3626)
// and add boost equivalent from Paul, Chris, John, if available
inline float reverse_bytes(float x) BOOST_NOEXCEPT;
inline double reverse_bytes(double x) BOOST_NOEXCEPT;
inline float reverse_bytes(float x) BOOST_NOEXCEPT;
//inline double reverse_bytes(double x) BOOST_NOEXCEPT;
// general reverse_bytes function template to meet requests for UDT support by Vicente
// Botet and others.
@@ -155,6 +151,20 @@ namespace endian
# endif
}
inline float reverse_bytes(float x) BOOST_NOEXCEPT
{
BOOST_STATIC_ASSERT_MSG(sizeof(float) == sizeof(uint32_t),
"boost::endian only supprts sizeof(float) == 4; please report error to boost mailing list");
uint32_t tmp = reverse_bytes(*(const uint32_t*)&x);
return *(const float*)&tmp;
}
//inline double reverse_bytes(double x) BOOST_NOEXCEPT
//{
// BOOST_STATIC_ASSERT_MSG(sizeof(double) == sizeof(uint64_t),
// "boost::endian only supprts sizeof(double) == 8; please report error to boost mailing list");
//}
// general reverse_bytes function template implementation approach using std::reverse
// suggested by Mathias Gaunard
template <class T>

7
include/boost/endian/detail/intrinsic.hpp
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@@ -1,6 +1,5 @@
// Copyright (C) 2012 David Stone
// Distributed under the Boost Software License, Version 1.0.
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
//
// See http://www.boost.org/libs/endian/ for documentation.
@@ -15,12 +14,6 @@
# include <boost/cstdint.hpp>
#endif
#undef BOOST_ENDIAN_NO_INTRINSICS
#undef BOOST_ENDIAN_INTRINSIC_BYTE_SWAP_2
#undef BOOST_ENDIAN_INTRINSIC_BYTE_SWAP_4
#undef BOOST_ENDIAN_INTRINSIC_BYTE_SWAP_8
#if (defined __GNUC__ || defined __clang__)
#include <byteswap.h>
#define BOOST_ENDIAN_INTRINSIC_BYTE_SWAP_2 bswap_16

4
test/converter_test.cpp
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@@ -306,6 +306,10 @@ int cpp_main(int, char * [])
test_conditional_reverse_bytes();
test_compile_time_convert_bytes();
test_runtime_convert_bytes();
BOOST_TEST(be::reverse_bytes(1.0F) != 1.0F);
BOOST_TEST(be::reverse_bytes(be::reverse_bytes(1.0F)) == 1.0F);
return ::boost::report_errors();
}