boost/stl_interfaces/config.hpp

0001 // Copyright (C) 2020 T. Zachary Laine
0002 //
0003 // Distributed under the Boost Software License, Version 1.0. (See
0004 // accompanying file LICENSE_1_0.txt or copy at
0005 // http://www.boost.org/LICENSE_1_0.txt)
0006 #ifndef BOOST_STL_INTERFACES_CONFIG_HPP
0007 #define BOOST_STL_INTERFACES_CONFIG_HPP
0008
0009 // Included for BOOST_CLANG_VERSION
0010 #include <boost/config.hpp>
0011
0012 // Included for definition of __cpp_lib_concepts.
0013 #include <iterator>
0014
0015
0016 #if defined(__cpp_lib_concepts) && defined(__cpp_lib_ranges) &&                \
0017     !defined(BOOST_STL_INTERFACES_DISABLE_CONCEPTS)
0018 #define BOOST_STL_INTERFACES_USE_CONCEPTS 1
0019 #else
0020 #define BOOST_STL_INTERFACES_USE_CONCEPTS 0
0021 #endif
0022
0023 #if (                                                                          \
0024     defined(__cpp_explicit_this_parameter) ||                                  \
0025     (defined(_MSC_VER) && _MSC_VER >= 1941) ||                                 \
0026     (defined(BOOST_CLANG_VERSION) && BOOST_CLANG_VERSION >= 190000)) &&        \
0027     BOOST_STL_INTERFACES_USE_CONCEPTS && (202002L < __cplusplus) &&            \
0028     !defined(BOOST_STL_INTERFACES_DISABLE_DEDUCED_THIS)
0029 #define BOOST_STL_INTERFACES_USE_DEDUCED_THIS 1
0030 #else
0031 #define BOOST_STL_INTERFACES_USE_DEDUCED_THIS 0
0032 #endif
0033
0034 // The inline namespaces v1, v2, and v3 represent C++14, C++20, and C++23 and
0035 // later, respectively.  v1 is inline for standards before C++20, and v2 is
0036 // inline for C++20 and later.  Note that this only applies to code for which
0037 // multiple vI namespace alternatives exist.  For example, some instances of
0038 // the v1 namespace may still be inline, if there is no v2 version of its
0039 // contents.
0040 #if !BOOST_STL_INTERFACES_USE_CONCEPTS && !BOOST_STL_INTERFACES_USE_DEDUCED_THIS
0041 #    define BOOST_STL_INTERFACES_NAMESPACE_V1 inline namespace v1
0042 #    define BOOST_STL_INTERFACES_NAMESPACE_V2 namespace v2
0043 #    define BOOST_STL_INTERFACES_NAMESPACE_V3 namespace v3
0044 #elif BOOST_STL_INTERFACES_USE_CONCEPTS && !BOOST_STL_INTERFACES_USE_DEDUCED_THIS
0045 #    define BOOST_STL_INTERFACES_NAMESPACE_V1 namespace v1
0046 #    define BOOST_STL_INTERFACES_NAMESPACE_V2 inline namespace v2
0047 #    define BOOST_STL_INTERFACES_NAMESPACE_V3 namespace v3
0048 #else
0049 #    define BOOST_STL_INTERFACES_NAMESPACE_V1 namespace v1
0050 #    define BOOST_STL_INTERFACES_NAMESPACE_V2 namespace v2
0051 #    define BOOST_STL_INTERFACES_NAMESPACE_V3 inline namespace v3
0052 #endif
0053
0054 #endif