/usr/include/boost/math/constants/info.hpp is in libboost1.55-dev 1.55.0+dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 | // Copyright John Maddock 2010.
// Use, modification and distribution are subject to 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)
#ifdef _MSC_VER
# pragma once
#endif
#ifndef BOOST_MATH_CONSTANTS_INFO_INCLUDED
#define BOOST_MATH_CONSTANTS_INFO_INCLUDED
#include <boost/math/constants/constants.hpp>
#include <iostream>
#include <iomanip>
#include <typeinfo>
namespace boost{ namespace math{ namespace constants{
namespace detail{
template <class T>
const char* nameof(BOOST_MATH_EXPLICIT_TEMPLATE_TYPE_SPEC(T))
{
return typeid(T).name();
}
template <>
const char* nameof<float>(BOOST_MATH_EXPLICIT_TEMPLATE_TYPE_SPEC(float))
{
return "float";
}
template <>
const char* nameof<double>(BOOST_MATH_EXPLICIT_TEMPLATE_TYPE_SPEC(double))
{
return "double";
}
template <>
const char* nameof<long double>(BOOST_MATH_EXPLICIT_TEMPLATE_TYPE_SPEC(long double))
{
return "long double";
}
}
template <class T, class Policy>
void print_info_on_type(std::ostream& os = std::cout BOOST_MATH_APPEND_EXPLICIT_TEMPLATE_TYPE_SPEC(T) BOOST_MATH_APPEND_EXPLICIT_TEMPLATE_TYPE_SPEC(Policy))
{
using detail::nameof;
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable:4127)
#endif
os <<
"Information on the Implementation and Handling of \n"
"Mathematical Constants for Type " << nameof<T>() <<
"\n\n"
"Checking for std::numeric_limits<" << nameof<T>() << "> specialisation: " <<
(std::numeric_limits<T>::is_specialized ? "yes" : "no") << std::endl;
if(std::numeric_limits<T>::is_specialized)
{
os <<
"std::numeric_limits<" << nameof<T>() << ">::digits reports that the radix is " << std::numeric_limits<T>::radix << ".\n";
if (std::numeric_limits<T>::radix == 2)
{
os <<
"std::numeric_limits<" << nameof<T>() << ">::digits reports that the precision is \n" << std::numeric_limits<T>::digits << " binary digits.\n";
}
else if (std::numeric_limits<T>::radix == 10)
{
os <<
"std::numeric_limits<" << nameof<T>() << ">::digits reports that the precision is \n" << std::numeric_limits<T>::digits10 << " decimal digits.\n";
os <<
"std::numeric_limits<" << nameof<T>() << ">::digits reports that the precision is \n"
<< std::numeric_limits<T>::digits * 1000L /301L << " binary digits.\n"; // divide by log2(10) - about 3 bits per decimal digit.
}
else
{
os << "Unknown radix = " << std::numeric_limits<T>::radix << "\n";
}
}
typedef typename boost::math::policies::precision<T, Policy>::type precision_type;
if(precision_type::value)
{
if (std::numeric_limits<T>::radix == 2)
{
os <<
"boost::math::policies::precision<" << nameof<T>() << ", " << nameof<Policy>() << " reports that the compile time precision is \n" << precision_type::value << " binary digits.\n";
}
else if (std::numeric_limits<T>::radix == 10)
{
os <<
"boost::math::policies::precision<" << nameof<T>() << ", " << nameof<Policy>() << " reports that the compile time precision is \n" << precision_type::value << " binary digits.\n";
}
else
{
os << "Unknown radix = " << std::numeric_limits<T>::radix << "\n";
}
}
else
{
os <<
"boost::math::policies::precision<" << nameof<T>() << ", Policy> \n"
"reports that there is no compile type precision available.\n"
"boost::math::tools::digits<" << nameof<T>() << ">() \n"
"reports that the current runtime precision is \n" <<
boost::math::tools::digits<T>() << " binary digits.\n";
}
typedef typename construction_traits<T, Policy>::type construction_type;
switch(construction_type::value)
{
case 0:
os <<
"No compile time precision is available, the construction method \n"
"will be decided at runtime and results will not be cached \n"
"- this may lead to poor runtime performance.\n"
"Current runtime precision indicates that\n";
if(boost::math::tools::digits<T>() > max_string_digits)
{
os << "the constant will be recalculated on each call.\n";
}
else
{
os << "the constant will be constructed from a string on each call.\n";
}
break;
case 1:
os <<
"The constant will be constructed from a float.\n";
break;
case 2:
os <<
"The constant will be constructed from a double.\n";
break;
case 3:
os <<
"The constant will be constructed from a long double.\n";
break;
case 4:
os <<
"The constant will be constructed from a string (and the result cached).\n";
break;
default:
os <<
"The constant will be calculated (and the result cached).\n";
break;
}
os << std::endl;
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
}
template <class T>
void print_info_on_type(std::ostream& os = std::cout BOOST_MATH_APPEND_EXPLICIT_TEMPLATE_TYPE_SPEC(T))
{
print_info_on_type<T, boost::math::policies::policy<> >(os);
}
}}} // namespaces
#endif // BOOST_MATH_CONSTANTS_INFO_INCLUDED
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