iterator_traits.hpp

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// SPDX-License-Identifier: BSD-3-Clause
/* Copyright 2018, Intel Corporation */
 
#ifndef LIBPMEMOBJ_CPP_ITERATOR_TRAITS_HPP
#define LIBPMEMOBJ_CPP_ITERATOR_TRAITS_HPP
 
#include <iterator>
 
namespace pmem
{
 
namespace detail
{
 
template <typename T, typename U, typename C = void>
struct has_iterator_category_convertible_to : std::false_type {
};
 
template <typename T, typename U>
struct has_iterator_category_convertible_to<
    T, U,
    typename std::enable_if<std::is_convertible<
        typename std::iterator_traits<T>::iterator_category,
        U>::value>::type> : std::true_type {
};
 
template <typename T>
struct is_output_iterator
    : public has_iterator_category_convertible_to<T, std::output_iterator_tag> {
};
 
template <typename T>
struct is_input_iterator
    : public has_iterator_category_convertible_to<T, std::input_iterator_tag> {
};
 
template <typename T>
struct is_forward_iterator
    : public has_iterator_category_convertible_to<T,
                          std::forward_iterator_tag> {
};
 
template <typename T>
struct is_bidirectional_iterator : public has_iterator_category_convertible_to<
                       T, std::bidirectional_iterator_tag> {
};
 
template <typename T>
struct is_random_access_iterator : public has_iterator_category_convertible_to<
                       T, std::random_access_iterator_tag> {
};
 
} /* namespace detail */
 
} /* namespace pmem */
 
#endif /* LIBPMEMOBJ_CPP_ITERATOR_TRAITS_HPP */