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Davide Pesavento409cc202015-09-19 14:13:16 +02001/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
Davide Pesavento1c597a12017-10-06 15:34:24 -04002/*
Junxiao Shib849f612018-04-01 23:52:54 +00003 * Copyright (c) 2013-2018 Regents of the University of California.
Davide Pesavento409cc202015-09-19 14:13:16 +02004 *
5 * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
6 *
7 * ndn-cxx library is free software: you can redistribute it and/or modify it under the
8 * terms of the GNU Lesser General Public License as published by the Free Software
9 * Foundation, either version 3 of the License, or (at your option) any later version.
10 *
11 * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
12 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
13 * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
14 *
15 * You should have received copies of the GNU General Public License and GNU Lesser
16 * General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
17 * <http://www.gnu.org/licenses/>.
18 *
19 * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
20 */
21
22#ifndef NDN_UTIL_BACKPORTS_HPP
23#define NDN_UTIL_BACKPORTS_HPP
24
25#include "../common.hpp"
26
Davide Pesavento1c597a12017-10-06 15:34:24 -040027#ifdef __has_cpp_attribute
28# define NDN_CXX_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
29#else
30# define NDN_CXX_HAS_CPP_ATTRIBUTE(x) 0
31#endif
32
33#ifdef __has_include
34# define NDN_CXX_HAS_INCLUDE(x) __has_include(x)
35#else
36# define NDN_CXX_HAS_INCLUDE(x) 0
37#endif
38
Davide Pesaventoa52eb1f2017-10-06 20:37:43 -040039#if (__cplusplus > 201402L) && NDN_CXX_HAS_CPP_ATTRIBUTE(fallthrough)
Davide Pesavento1c597a12017-10-06 15:34:24 -040040# define NDN_CXX_FALLTHROUGH [[fallthrough]]
41#elif NDN_CXX_HAS_CPP_ATTRIBUTE(clang::fallthrough)
42# define NDN_CXX_FALLTHROUGH [[clang::fallthrough]]
43#elif NDN_CXX_HAS_CPP_ATTRIBUTE(gnu::fallthrough)
44# define NDN_CXX_FALLTHROUGH [[gnu::fallthrough]]
45#elif defined(__GNUC__) && (__GNUC__ >= 7)
46# define NDN_CXX_FALLTHROUGH __attribute__((fallthrough))
47#else
48# define NDN_CXX_FALLTHROUGH ((void)0)
49#endif
50
Davide Pesavento1fd00242018-05-20 00:11:01 -040051#include "backports-ostream-joiner.hpp"
52#include "nonstd/optional.hpp"
Davide Pesavento409cc202015-09-19 14:13:16 +020053
Davide Pesavento1fd00242018-05-20 00:11:01 -040054#ifndef NDN_CXX_HAVE_STD_TO_STRING
55#include <boost/lexical_cast.hpp>
56#endif
57
58namespace ndn {
Davide Pesavento409cc202015-09-19 14:13:16 +020059
Davide Pesavento96b96af2015-09-19 23:00:40 +020060#ifdef NDN_CXX_HAVE_STD_TO_STRING
61using std::to_string;
62#else
63template<typename V>
64inline std::string
65to_string(const V& v)
66{
67 return boost::lexical_cast<std::string>(v);
68}
69#endif // NDN_CXX_HAVE_STD_TO_STRING
70
Weiwei Liucfaa1ad2016-08-28 16:30:56 -070071#if __cpp_lib_clamp >= 201603
72using std::clamp;
73#else
74template<typename T, typename Compare>
75constexpr const T&
76clamp(const T& v, const T& lo, const T& hi, Compare comp)
77{
78 return comp(v, lo) ? lo : comp(hi, v) ? hi : v;
79}
80
81template<typename T>
82constexpr const T&
83clamp(const T& v, const T& lo, const T& hi)
84{
85 return (v < lo) ? lo : (hi < v) ? hi : v;
86}
87#endif // __cpp_lib_clamp
88
Davide Pesavento1fd00242018-05-20 00:11:01 -040089using ::nonstd::optional;
90using ::nonstd::bad_optional_access;
91using ::nonstd::nullopt;
92using ::nonstd::nullopt_t;
93using ::nonstd::in_place;
94using ::nonstd::in_place_t;
95using ::nonstd::make_optional;
Davide Pesavento409cc202015-09-19 14:13:16 +020096
Davide Pesavento1fd00242018-05-20 00:11:01 -040097} // namespace ndn
Junxiao Shi1aecae22016-08-30 11:23:59 +000098
Davide Pesavento409cc202015-09-19 14:13:16 +020099#endif // NDN_UTIL_BACKPORTS_HPP