0b6a182c
 Hu Chunming
添加无鉴权注册和注销
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// Copyright (C) 2019 T. Zachary Laine
//
// Distributed under 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_STL_INTERFACES_FWD_HPP
#define BOOST_STL_INTERFACES_FWD_HPP
#include <boost/stl_interfaces/config.hpp>
#if BOOST_STL_INTERFACES_USE_CONCEPTS
#include <ranges>
#endif
#if defined(__cpp_lib_three_way_comparison)
#include <compare>
#endif
#ifndef BOOST_STL_INTERFACES_DOXYGEN
#if defined(_MSC_VER) || defined(__GNUC__) && __GNUC__ < 8
#define BOOST_STL_INTERFACES_NO_HIDDEN_FRIEND_CONSTEXPR
#define BOOST_STL_INTERFACES_HIDDEN_FRIEND_CONSTEXPR
#else
#define BOOST_STL_INTERFACES_HIDDEN_FRIEND_CONSTEXPR constexpr
#endif
#if defined(__GNUC__) && __GNUC__ < 9
#define BOOST_STL_INTERFACES_CONCEPT concept bool
#else
#define BOOST_STL_INTERFACES_CONCEPT concept
#endif
#endif
namespace boost { namespace stl_interfaces {
/** An enumeration used to indicate whether the underlying data have a
contiguous or discontiguous layout when instantiating `view_interface`
and `sequence_container_interface`. */
enum class element_layout : bool {
discontiguous = false,
contiguous = true
};
BOOST_STL_INTERFACES_NAMESPACE_V1 {
namespace v1_dtl {
template<typename... T>
using void_t = void;
template<typename Iter>
using iter_difference_t =
typename std::iterator_traits<Iter>::difference_type;
template<typename Range, typename = void>
struct iterator;
template<typename Range>
struct iterator<
Range,
void_t<decltype(std::declval<Range &>().begin())>>
{
using type = decltype(std::declval<Range &>().begin());
};
template<typename Range>
using iterator_t = typename iterator<Range>::type;
template<typename Range, typename = void>
struct sentinel;
template<typename Range>
struct sentinel<
Range,
void_t<decltype(std::declval<Range &>().end())>>
{
using type = decltype(std::declval<Range &>().end());
};
template<typename Range>
using sentinel_t = typename sentinel<Range>::type;
template<typename Range>
using range_difference_t = iter_difference_t<iterator_t<Range>>;
template<typename Range>
using common_range =
std::is_same<iterator_t<Range>, sentinel_t<Range>>;
template<typename Range, typename = void>
struct decrementable_sentinel : std::false_type
{
};
template<typename Range>
struct decrementable_sentinel<
Range,
void_t<decltype(--std::declval<sentinel_t<Range> &>())>>
: std::true_type
{
};
}
}
}}
#endif
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