ceph/src/boost/libs/safe_numerics/example/safe_format.hpp

   1 #ifndef BOOST_SAFE_FORMAT_HPP
   2 #define BOOST_SAFE_FORMAT_HPP
   3
   4 //  Copyright (c) 2015 Robert Ramey
   5 //
   6 // Distributed under the Boost Software License, Version 1.0. (See
   7 // accompanying file LICENSE_1_0.txt or copy at
   8 // http://www.boost.org/LICENSE_1_0.txt)
   9
  10 #include <ostream>
  11 #include <typeinfo>
  12
  13 #include <boost/core/demangle.hpp>
  14 #include <boost/safe_numerics/safe_common.hpp>
  15
  16 namespace {
  17
  18 // create an output manipulator which prints variable type and limits
  19 // as well as value
  20 template<typename T>
  21 struct safe_format_impl {
  22     const T & m_t;
  23     safe_format_impl(const T & t) :
  24         m_t(t)
  25     {}
  26     template <class charT, class Traits>
  27     friend std::basic_ostream<charT,Traits> &
  28     operator<<(
  29         std::basic_ostream<charT,Traits> & os,
  30         const safe_format_impl<T> & f
  31     ){
  32         return os
  33             << "<"
  34             << boost::core::demangle(typeid(
  35                 typename boost::safe_numerics::base_type<T>::type
  36                 ).name()
  37             )
  38             << ">["
  39             << std::numeric_limits<T>::min() << ","
  40             << std::numeric_limits<T>::max() << "] = "
  41             << f.m_t;
  42     }
  43 };
  44
  45 } // anonymous namespace
  46
  47 template<typename T>
  48 auto safe_format(const T & t){
  49     return safe_format_impl<T>(t);
  50 }
  51
  52 #endif // BOOST_SAFE_FORMAT_HPP