update ceph source to reef 18.1.2

[ceph.git] / ceph / src / boost / boost / math / tools / detail / is_const_iterable.hpp

//  (C) Copyright John Maddock 2018.
//  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)

#ifndef BOOST_MATH_TOOLS_IS_CONST_ITERABLE_HPP
#define BOOST_MATH_TOOLS_IS_CONST_ITERABLE_HPP

#include <boost/math/tools/cxx03_warn.hpp>

#define BOOST_MATH_HAS_IS_CONST_ITERABLE

#include <boost/math/tools/is_detected.hpp>
#include <utility>

namespace boost {
   namespace math {
      namespace tools {
         namespace detail {

            template<class T>
            using begin_t = decltype(std::declval<const T&>().begin());
            template<class T>
            using end_t = decltype(std::declval<const T&>().end());
            template<class T>
            using const_iterator_t = typename T::const_iterator;

            template <class T>
            struct is_const_iterable
               : public std::integral_constant<bool,
               is_detected<begin_t, T>::value
               && is_detected<end_t, T>::value
               && is_detected<const_iterator_t, T>::value
               > {};

} } } }

#endif // BOOST_MATH_TOOLS_IS_CONST_ITERABLE_HPP