ceph/src/boost/boost/math/tools/detail/is_const_iterable.hpp

   1 //  (C) Copyright John Maddock 2018.
   2 //  Use, modification and distribution are subject to the
   3 //  Boost 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_MATH_TOOLS_IS_CONST_ITERABLE_HPP
   7 #define BOOST_MATH_TOOLS_IS_CONST_ITERABLE_HPP
   8
   9 #include <boost/math/tools/cxx03_warn.hpp>
  10
  11 #define BOOST_MATH_HAS_IS_CONST_ITERABLE
  12
  13 #include <boost/math/tools/is_detected.hpp>
  14 #include <utility>
  15
  16 namespace boost {
  17    namespace math {
  18       namespace tools {
  19          namespace detail {
  20
  21             template<class T>
  22             using begin_t = decltype(std::declval<const T&>().begin());
  23             template<class T>
  24             using end_t = decltype(std::declval<const T&>().end());
  25             template<class T>
  26             using const_iterator_t = typename T::const_iterator;
  27
  28             template <class T>
  29             struct is_const_iterable
  30                : public std::integral_constant<bool,
  31                is_detected<begin_t, T>::value
  32                && is_detected<end_t, T>::value
  33                && is_detected<const_iterator_t, T>::value
  34                > {};
  35
  36 } } } }
  37
  38 #endif // BOOST_MATH_TOOLS_IS_CONST_ITERABLE_HPP