1/* Copyright 2003-2022 Joaquin M Lopez Munoz.
2 * Distributed under the Boost Software License, Version 1.0.
3 * (See accompanying file LICENSE_1_0.txt or copy at
4 * http://www.boost.org/LICENSE_1_0.txt)
5 *
6 * See http://www.boost.org/libs/multi_index for library home page.
7 */
8
9#if !defined(BOOST_CONFIG_HPP)
10#error <boost/config.hpp> must be included before this header
11#endif
12
13#if !defined(BOOST_MULTI_INDEX_DETAIL_UNDEF_IF_CONSTEXPR_MACRO)
14
15#if !defined(BOOST_NO_CXX17_IF_CONSTEXPR)
16#define BOOST_MULTI_INDEX_IF_CONSTEXPR if constexpr
17#else
18#define BOOST_MULTI_INDEX_IF_CONSTEXPR if
19#if defined(BOOST_MSVC)
20#define BOOST_MULTI_INDEX_DETAIL_C4127_DISABLED
21#pragma warning(push)
22#pragma warning(disable:4127) /* conditional expression is constant */
23#endif
24#endif
25
26#else
27
28#undef BOOST_MULTI_INDEX_IF_CONSTEXPR
29#if defined(BOOST_MULTI_INDEX_DETAIL_C4127_DISABLED)
30#pragma warning(pop)
31#undef BOOST_MULTI_INDEX_DETAIL_C4127_DISABLED
32#endif
33
34#endif
35