ceph/src/boost/boost/multiprecision/detail/min_max.hpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 //  Copyright 2016 John Maddock. Distributed under the Boost
   3 //  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_MP_MIN_MAX_HPP
   7 #define BOOST_MP_MIN_MAX_HPP
   8
   9 #include <boost/multiprecision/traits/is_backend.hpp>
  10
  11 namespace boost { namespace multiprecision {
  12
  13 //
  14 // Expression template overloads for (min) and (max):
  15 //
  16 // Introduced in response to https://svn.boost.org/trac/boost/ticket/11149
  17 // note that these can not legally be injected into namespace std, and that doing so
  18 // may break future enhancements to the standard.  None the less adding
  19 // namespace std{ using boost::multiprecision::(min); using boost::multiprecision::(max); }
  20 // to your code may get some generic code working that wouldn't work otherwise.
  21 //
  22 // The use of enable_if on the return type is to avoid poisoning std::min/max,
  23 // otherwise attempting to make an explicit call to min<long>(a, b) when these and std
  24 // versions are in scope, will cause the compiler to try to instantiate the signatures
  25 // for our versions as well as the std ones, which in turn instantiates number<long>
  26 // which fails to compile as "long" is not a valid backend type.
  27 //
  28 template <class Backend>
  29 inline typename boost::enable_if_c<boost::multiprecision::detail::is_backend<Backend>::value, const number<Backend, et_on>&>::type(min)(const number<Backend, et_on>& a, const number<Backend, et_on>& b)
  30 {
  31    return a < b ? a : b;
  32 }
  33 template <class Backend, class tag, class A1, class A2, class A3, class A4>
  34 inline typename boost::enable_if_c<boost::multiprecision::detail::is_backend<Backend>::value, const number<Backend, et_on> >::type(min)(const number<Backend, et_on>& a, const detail::expression<tag, A1, A2, A3, A4>& b)
  35 {
  36    number<Backend, et_on> t(b);
  37    if (a < t)
  38       return a;
  39    return BOOST_MP_MOVE(t);
  40 }
  41 template <class tag, class A1, class A2, class A3, class A4, class Backend>
  42 inline typename boost::enable_if_c<boost::multiprecision::detail::is_backend<Backend>::value, const number<Backend, et_on> >::type(min)(const detail::expression<tag, A1, A2, A3, A4>& a, const number<Backend, et_on>& b)
  43 {
  44    number<Backend, et_on> t(a);
  45    if (t < b)
  46       return BOOST_MP_MOVE(t);
  47    return b;
  48 }
  49 template <class tag, class A1, class A2, class A3, class A4, class tagb, class A1b, class A2b, class A3b, class A4b>
  50 inline typename detail::expression<tag, A1, A2, A3, A4>::result_type(min)(const detail::expression<tag, A1, A2, A3, A4>& a, const detail::expression<tagb, A1b, A2b, A3b, A4b>& b)
  51 {
  52    typename detail::expression<tag, A1, A2, A3, A4>::result_type t1(a), t2(b);
  53    if (t1 < t2)
  54       return BOOST_MP_MOVE(t1);
  55    return BOOST_MP_MOVE(t2);
  56 }
  57 template <class tag, class A1, class A2, class A3, class A4>
  58 inline typename detail::expression<tag, A1, A2, A3, A4>::result_type(min)(const detail::expression<tag, A1, A2, A3, A4>& a, const detail::expression<tag, A1, A2, A3, A4>& b)
  59 {
  60    typename detail::expression<tag, A1, A2, A3, A4>::result_type t1(a), t2(b);
  61    if (t1 < t2)
  62       return BOOST_MP_MOVE(t1);
  63    return BOOST_MP_MOVE(t2);
  64 }
  65
  66 template <class Backend>
  67 inline typename boost::enable_if_c<boost::multiprecision::detail::is_backend<Backend>::value, const number<Backend, et_on>&>::type(max)(const number<Backend, et_on>& a, const number<Backend, et_on>& b)
  68 {
  69    return a > b ? a : b;
  70 }
  71 template <class Backend, class tag, class A1, class A2, class A3, class A4>
  72 inline typename boost::enable_if_c<boost::multiprecision::detail::is_backend<Backend>::value, const number<Backend, et_on> >::type(max)(const number<Backend, et_on>& a, const detail::expression<tag, A1, A2, A3, A4>& b)
  73 {
  74    number<Backend, et_on> t(b);
  75    if (a > t)
  76       return a;
  77    return BOOST_MP_MOVE(t);
  78 }
  79 template <class tag, class A1, class A2, class A3, class A4, class Backend>
  80 inline typename boost::enable_if_c<boost::multiprecision::detail::is_backend<Backend>::value, const number<Backend, et_on> >::type(max)(const detail::expression<tag, A1, A2, A3, A4>& a, const number<Backend, et_on>& b)
  81 {
  82    number<Backend, et_on> t(a);
  83    if (t > b)
  84       return BOOST_MP_MOVE(t);
  85    return b;
  86 }
  87 template <class tag, class A1, class A2, class A3, class A4, class tagb, class A1b, class A2b, class A3b, class A4b>
  88 inline typename detail::expression<tag, A1, A2, A3, A4>::result_type(max)(const detail::expression<tag, A1, A2, A3, A4>& a, const detail::expression<tagb, A1b, A2b, A3b, A4b>& b)
  89 {
  90    typename detail::expression<tag, A1, A2, A3, A4>::result_type t1(a), t2(b);
  91    if (t1 > t2)
  92       return BOOST_MP_MOVE(t1);
  93    return BOOST_MP_MOVE(t2);
  94 }
  95 template <class tag, class A1, class A2, class A3, class A4>
  96 inline typename detail::expression<tag, A1, A2, A3, A4>::result_type(max)(const detail::expression<tag, A1, A2, A3, A4>& a, const detail::expression<tag, A1, A2, A3, A4>& b)
  97 {
  98    typename detail::expression<tag, A1, A2, A3, A4>::result_type t1(a), t2(b);
  99    if (t1 > t2)
 100       return BOOST_MP_MOVE(t1);
 101    return BOOST_MP_MOVE(t2);
 102 }
 103
 104 }} // namespace boost::multiprecision
 105
 106 #endif