ceph/src/boost/boost/log/utility/functional/in_range.hpp

   1 /*
   2  *          Copyright Andrey Semashev 2007 - 2015.
   3  * Distributed under the Boost Software License, Version 1.0.
   4  *    (See accompanying file LICENSE_1_0.txt or copy at
   5  *          http://www.boost.org/LICENSE_1_0.txt)
   6  */
   7 /*!
   8  * \file   in_range.hpp
   9  * \author Andrey Semashev
  10  * \date   30.03.2008
  11  *
  12  * This header contains a predicate for checking if the provided value is within a half-open range.
  13  */
  14
  15 #ifndef BOOST_LOG_UTILITY_FUNCTIONAL_IN_RANGE_HPP_INCLUDED_
  16 #define BOOST_LOG_UTILITY_FUNCTIONAL_IN_RANGE_HPP_INCLUDED_
  17
  18 #include <utility>
  19 #include <boost/log/detail/config.hpp>
  20 #include <boost/log/utility/functional/logical.hpp> // make_common_integral_type
  21 #include <boost/log/detail/header.hpp>
  22
  23 #ifdef BOOST_HAS_PRAGMA_ONCE
  24 #pragma once
  25 #endif
  26
  27 namespace boost {
  28
  29 BOOST_LOG_OPEN_NAMESPACE
  30
  31 //! The in_range functor
  32 struct in_range_fun
  33 {
  34     typedef bool result_type;
  35
  36     template< typename T, typename U >
  37     bool operator() (T const& value, std::pair< U, U > const& rng) const
  38     {
  39         return op(value, rng, typename mpl::and_< is_integral< T >, is_integral< U > >::type());
  40     }
  41
  42 private:
  43     template< typename T, typename U >
  44     static bool op(T const& value, std::pair< U, U > const& rng, mpl::false_ const&)
  45     {
  46         return (value >= rng.first && value < rng.second);
  47     }
  48     template< typename T, typename U >
  49     static bool op(T const& value, std::pair< U, U > const& rng, mpl::true_ const&)
  50     {
  51         typedef typename aux::make_common_integral_type< T, U >::type common_integral_type;
  52         return (static_cast< common_integral_type >(value) >= static_cast< common_integral_type >(rng.first))
  53             && (static_cast< common_integral_type >(value) < static_cast< common_integral_type >(rng.second));
  54     }
  55 };
  56
  57 BOOST_LOG_CLOSE_NAMESPACE // namespace log
  58
  59 } // namespace boost
  60
  61 #include <boost/log/detail/footer.hpp>
  62
  63 #endif // BOOST_LOG_UTILITY_FUNCTIONAL_IN_RANGE_HPP_INCLUDED_