63e88f80
 Hu Chunming
提交三方库
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/*=============================================================================
Copyright (c) 2010 Bryce Lelbach
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)
=============================================================================*/
#include <boost/config.hpp>
#if defined(BOOST_NO_FENV_H)
#error This platform does not have a floating point environment
#endif
#if !defined(BOOST_DETAIL_FENV_HPP)
#define BOOST_DETAIL_FENV_HPP
/* If we're using clang + glibc, we have to get hacky.
* See http://llvm.org/bugs/show_bug.cgi?id=6907 */
#if defined(__clang__) && (__clang_major__ < 3) && \
defined(__GNU_LIBRARY__) && /* up to version 5 */ \
defined(__GLIBC__) && /* version 6 + */ \
!defined(_FENV_H)
#define _FENV_H
#include <features.h>
#include <bits/fenv.h>
extern "C" {
extern int fegetexceptflag (fexcept_t*, int) __THROW;
extern int fesetexceptflag (__const fexcept_t*, int) __THROW;
extern int feclearexcept (int) __THROW;
extern int feraiseexcept (int) __THROW;
extern int fetestexcept (int) __THROW;
extern int fegetround (void) __THROW;
extern int fesetround (int) __THROW;
extern int fegetenv (fenv_t*) __THROW;
extern int fesetenv (__const fenv_t*) __THROW;
extern int feupdateenv (__const fenv_t*) __THROW;
extern int feholdexcept (fenv_t*) __THROW;
#ifdef __USE_GNU
extern int feenableexcept (int) __THROW;
extern int fedisableexcept (int) __THROW;
extern int fegetexcept (void) __THROW;
#endif
}
namespace std { namespace tr1 {
using ::fenv_t;
using ::fexcept_t;
using ::fegetexceptflag;
using ::fesetexceptflag;
using ::feclearexcept;
using ::feraiseexcept;
using ::fetestexcept;
using ::fegetround;
using ::fesetround;
using ::fegetenv;
using ::fesetenv;
using ::feupdateenv;
using ::feholdexcept;
} }
#elif defined(__MINGW32__) && defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 408
// MinGW (32-bit) has a bug in mingw32/bits/c++config.h, it does not define _GLIBCXX_HAVE_FENV_H,
// which prevents the C fenv.h header contents to be included in the C++ wrapper header fenv.h. This is at least
// the case with gcc 4.8.1 packages tested so far, up to 4.8.1-4. Note that there is no issue with
// MinGW-w64.
// To work around the bug we avoid including the C++ wrapper header and include the C header directly
// and import all relevant symbols into std:: ourselves.
#include <../include/fenv.h>
namespace std {
using ::fenv_t;
using ::fexcept_t;
using ::fegetexceptflag;
using ::fesetexceptflag;
using ::feclearexcept;
using ::feraiseexcept;
using ::fetestexcept;
using ::fegetround;
using ::fesetround;
using ::fegetenv;
using ::fesetenv;
using ::feupdateenv;
using ::feholdexcept;
}
#else /* if we're not using GNU's C stdlib, fenv.h should work with clang */
#if defined(__SUNPRO_CC) /* lol suncc */
#include <stdio.h>
#endif
#include <fenv.h>
#endif
#endif /* BOOST_DETAIL_FENV_HPP */
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