| /* Copyright 2003-2020 Joaquin M Lopez Munoz. |
| * 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) |
| * |
| * See http://www.boost.org/libs/multi_index for library home page. |
| */ |
| |
| #include <boost/config.hpp> |
| |
| #if !defined(BOOST_MULTI_INDEX_DETAIL_UNDEF_IF_CONSTEXPR_MACRO) |
| |
| #if !defined(BOOST_NO_CXX17_IF_CONSTEXPR) |
| #define BOOST_MULTI_INDEX_IF_CONSTEXPR if constexpr |
| #else |
| #define BOOST_MULTI_INDEX_IF_CONSTEXPR if |
| #if defined(BOOST_MSVC) |
| #define BOOST_MULTI_INDEX_DETAIL_C4127_DISABLED |
| #pragma warning(push) |
| #pragma warning(disable:4127) /* conditional expression is constant */ |
| #endif |
| #endif |
| |
| #else |
| |
| #undef BOOST_MULTI_INDEX_IF_CONSTEXPR |
| #if defined(BOOST_MULTI_INDEX_DETAIL_C4127_DISABLED) |
| #pragma warning(pop) |
| #undef BOOST_MULTI_INDEX_DETAIL_C4127_DISABLED |
| #endif |
| |
| #endif |
