ceph/src/boost/libs/numeric/interval/include/boost/numeric/interval/policies.hpp

   1 /* Boost interval/policies.hpp template implementation file
   2  *
   3  * Copyright 2003 Guillaume Melquiond
   4  *
   5  * Distributed under the Boost Software License, Version 1.0.
   6  * (See accompanying file LICENSE_1_0.txt or
   7  * copy at http://www.boost.org/LICENSE_1_0.txt)
   8  */
   9
  10 #ifndef BOOST_NUMERIC_INTERVAL_POLICIES_HPP
  11 #define BOOST_NUMERIC_INTERVAL_POLICIES_HPP
  12
  13 #include <boost/numeric/interval/interval.hpp>
  14
  15 namespace boost {
  16 namespace numeric {
  17 namespace interval_lib {
  18
  19 /*
  20  * policies class
  21  */
  22
  23 template<class Rounding, class Checking>
  24 struct policies
  25 {
  26   typedef Rounding rounding;
  27   typedef Checking checking;
  28 };
  29
  30 /*
  31  * policies switching classes
  32  */
  33
  34 template<class OldInterval, class NewRounding>
  35 class change_rounding
  36 {
  37   typedef typename OldInterval::base_type T;
  38   typedef typename OldInterval::traits_type p;
  39   typedef typename p::checking checking;
  40 public:
  41   typedef interval<T, policies<NewRounding, checking> > type;
  42 };
  43
  44 template<class OldInterval, class NewChecking>
  45 class change_checking
  46 {
  47   typedef typename OldInterval::base_type T;
  48   typedef typename OldInterval::traits_type p;
  49   typedef typename p::rounding rounding;
  50 public:
  51   typedef interval<T, policies<rounding, NewChecking> > type;
  52 };
  53
  54 /*
  55  * Protect / unprotect: control whether the rounding mode is set/reset
  56  * at each operation, rather than once and for all.
  57  */
  58
  59 template<class OldInterval>
  60 class unprotect
  61 {
  62   typedef typename OldInterval::base_type T;
  63   typedef typename OldInterval::traits_type p;
  64   typedef typename p::rounding r;
  65   typedef typename r::unprotected_rounding newRounding;
  66 public:
  67   typedef typename change_rounding<OldInterval, newRounding>::type type;
  68 };
  69
  70 } // namespace interval_lib
  71 } // namespace numeric
  72 } // namespace boost
  73
  74
  75 #endif // BOOST_NUMERIC_INTERVAL_POLICIES_HPP