1 | |
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2 | // Copyright 2005-2009 Daniel James. |
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3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
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4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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5 | // |
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6 | // On some platforms std::limits gives incorrect values for long double. |
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7 | // This tries to work around them. |
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8 | |
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9 | #if !defined(BOOST_FUNCTIONAL_HASH_DETAIL_LIMITS_HEADER) |
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10 | #define BOOST_FUNCTIONAL_HASH_DETAIL_LIMITS_HEADER |
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11 | |
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12 | #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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13 | # pragma once |
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14 | #endif |
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15 | |
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16 | #include <boost/limits.hpp> |
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17 | |
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18 | // On OpenBSD, numeric_limits is not reliable for long doubles, but |
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19 | // the macros defined in <float.h> are and support long double when STLport |
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20 | // doesn't. |
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21 | |
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22 | #if defined(__OpenBSD__) || defined(_STLP_NO_LONG_DOUBLE) |
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23 | #include <float.h> |
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24 | #endif |
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25 | |
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26 | namespace boost |
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27 | { |
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28 | namespace hash_detail |
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29 | { |
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30 | template <class T> |
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31 | struct limits : std::numeric_limits<T> {}; |
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32 | |
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33 | #if defined(__OpenBSD__) || defined(_STLP_NO_LONG_DOUBLE) |
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34 | template <> |
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35 | struct limits<long double> |
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36 | : std::numeric_limits<long double> |
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37 | { |
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38 | static long double epsilon() { |
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39 | return LDBL_EPSILON; |
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40 | } |
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41 | |
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42 | static long double (max)() { |
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43 | return LDBL_MAX; |
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44 | } |
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45 | |
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46 | static long double (min)() { |
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47 | return LDBL_MIN; |
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48 | } |
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49 | |
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50 | BOOST_STATIC_CONSTANT(int, digits = LDBL_MANT_DIG); |
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51 | BOOST_STATIC_CONSTANT(int, max_exponent = LDBL_MAX_EXP); |
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52 | BOOST_STATIC_CONSTANT(int, min_exponent = LDBL_MIN_EXP); |
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53 | #if defined(_STLP_NO_LONG_DOUBLE) |
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54 | BOOST_STATIC_CONSTANT(int, radix = FLT_RADIX); |
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55 | #endif |
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56 | }; |
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57 | #endif // __OpenBSD__ |
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58 | } |
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59 | } |
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60 | |
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61 | #endif |
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