ceph/src/boost/boost/math/special_functions/trunc.hpp

   1 //  Copyright John Maddock 2007.
   2 //  Use, modification and distribution are subject to the
   3 //  Boost Software License, Version 1.0. (See accompanying file
   4 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #ifndef BOOST_MATH_TRUNC_HPP
   7 #define BOOST_MATH_TRUNC_HPP
   8
   9 #ifdef _MSC_VER
  10 #pragma once
  11 #endif
  12
  13 #include <boost/math/special_functions/math_fwd.hpp>
  14 #include <boost/math/tools/config.hpp>
  15 #include <boost/math/policies/error_handling.hpp>
  16 #include <boost/math/special_functions/fpclassify.hpp>
  17
  18 namespace boost{ namespace math{ namespace detail{
  19
  20 template <class T, class Policy>
  21 inline typename tools::promote_args<T>::type trunc(const T& v, const Policy& pol, const mpl::false_&)
  22 {
  23    BOOST_MATH_STD_USING
  24    typedef typename tools::promote_args<T>::type result_type;
  25    if(!(boost::math::isfinite)(v))
  26       return policies::raise_rounding_error("boost::math::trunc<%1%>(%1%)", 0, static_cast<result_type>(v), static_cast<result_type>(v), pol);
  27    return (v >= 0) ? static_cast<result_type>(floor(v)) : static_cast<result_type>(ceil(v));
  28 }
  29
  30 template <class T, class Policy>
  31 inline typename tools::promote_args<T>::type trunc(const T& v, const Policy&, const mpl::true_&)
  32 {
  33    return v;
  34 }
  35
  36 }
  37
  38 template <class T, class Policy>
  39 inline typename tools::promote_args<T>::type trunc(const T& v, const Policy& pol)
  40 {
  41    return detail::trunc(v, pol, mpl::bool_<detail::is_integer_for_rounding<T>::value>());
  42 }
  43 template <class T>
  44 inline typename tools::promote_args<T>::type trunc(const T& v)
  45 {
  46    return trunc(v, policies::policy<>());
  47 }
  48 //
  49 // The following functions will not compile unless T has an
  50 // implicit convertion to the integer types.  For user-defined
  51 // number types this will likely not be the case.  In that case
  52 // these functions should either be specialized for the UDT in
  53 // question, or else overloads should be placed in the same
  54 // namespace as the UDT: these will then be found via argument
  55 // dependent lookup.  See our concept archetypes for examples.
  56 //
  57 template <class T, class Policy>
  58 inline int itrunc(const T& v, const Policy& pol)
  59 {
  60    BOOST_MATH_STD_USING
  61    typedef typename tools::promote_args<T>::type result_type;
  62    result_type r = boost::math::trunc(v, pol);
  63    if((r > (std::numeric_limits<int>::max)()) || (r < (std::numeric_limits<int>::min)()))
  64       return static_cast<int>(policies::raise_rounding_error("boost::math::itrunc<%1%>(%1%)", 0, static_cast<result_type>(v), 0, pol));
  65    return static_cast<int>(r);
  66 }
  67 template <class T>
  68 inline int itrunc(const T& v)
  69 {
  70    return itrunc(v, policies::policy<>());
  71 }
  72
  73 template <class T, class Policy>
  74 inline long ltrunc(const T& v, const Policy& pol)
  75 {
  76    BOOST_MATH_STD_USING
  77    typedef typename tools::promote_args<T>::type result_type;
  78    result_type r = boost::math::trunc(v, pol);
  79    if((r > (std::numeric_limits<long>::max)()) || (r < (std::numeric_limits<long>::min)()))
  80       return static_cast<long>(policies::raise_rounding_error("boost::math::ltrunc<%1%>(%1%)", 0, static_cast<result_type>(v), 0L, pol));
  81    return static_cast<long>(r);
  82 }
  83 template <class T>
  84 inline long ltrunc(const T& v)
  85 {
  86    return ltrunc(v, policies::policy<>());
  87 }
  88
  89 #ifdef BOOST_HAS_LONG_LONG
  90
  91 template <class T, class Policy>
  92 inline boost::long_long_type lltrunc(const T& v, const Policy& pol)
  93 {
  94    BOOST_MATH_STD_USING
  95    typedef typename tools::promote_args<T>::type result_type;
  96    result_type r = boost::math::trunc(v, pol);
  97    if((r > (std::numeric_limits<boost::long_long_type>::max)()) || (r < (std::numeric_limits<boost::long_long_type>::min)()))
  98       return static_cast<boost::long_long_type>(policies::raise_rounding_error("boost::math::lltrunc<%1%>(%1%)", 0, v, static_cast<boost::long_long_type>(0), pol));
  99    return static_cast<boost::long_long_type>(r);
 100 }
 101 template <class T>
 102 inline boost::long_long_type lltrunc(const T& v)
 103 {
 104    return lltrunc(v, policies::policy<>());
 105 }
 106
 107 #endif
 108
 109 }} // namespaces
 110
 111 #endif // BOOST_MATH_TRUNC_HPP