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1 | // Copyright Daniel Wallin, David Abrahams 2005. |
2 | // Copyright Cromwell D. Enage 2017. | |
3 | // Distributed under the Boost Software License, Version 1.0. | |
4 | // (See accompanying file LICENSE_1_0.txt or copy at | |
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5 | // http://www.boost.org/LICENSE_1_0.txt) |
6 | ||
7 | #ifndef BOOST_PARAMETER_CONFIG_050403_HPP | |
8 | #define BOOST_PARAMETER_CONFIG_050403_HPP | |
9 | ||
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10 | #include <boost/config.hpp> |
11 | #include <boost/config/workaround.hpp> | |
12 | ||
13 | // Allow projects to #define BOOST_PARAMETER_DISABLE_PERFECT_FORWARDING to | |
14 | // turn off perfect forwarding as necessary. Otherwise, also require correct | |
15 | // SFINAE support, needed explicitly by tagged_argument & keyword & cast; | |
16 | // correct function template ordering, needed by the code generation macros; | |
17 | // rvalue references, needed throughout; variadic templates, needed by | |
18 | // parameters; function template default arguments, needed by the code | |
19 | // generation macros; and the ability to handle multiple parameter packs, | |
20 | // needed by parameters. Older versions of GCC either don't have the latter | |
21 | // ability or cannot disambiguate between keyword's overloaded | |
22 | // operators. Older versions of Clang either fail to compile due to | |
23 | // differences in length between parameter packs 'Args' and 'args' or fail at | |
24 | // runtime due to segmentation faults. | |
25 | // -- Cromwell D. Enage | |
26 | #if !defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING) && \ | |
27 | !defined(BOOST_PARAMETER_DISABLE_PERFECT_FORWARDING) && \ | |
28 | !defined(BOOST_NO_SFINAE) && \ | |
29 | !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING) && \ | |
30 | !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && \ | |
31 | !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && \ | |
32 | !defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS) && \ | |
33 | !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) && !( \ | |
34 | defined(BOOST_CLANG) && (1 == BOOST_CLANG) && ( \ | |
35 | (__clang_major__ < 3) || ( \ | |
36 | (3 == __clang_major__) && (__clang_minor__ < 2) \ | |
37 | ) \ | |
38 | ) \ | |
39 | ) && !BOOST_WORKAROUND(BOOST_GCC, < 40900) | |
40 | #define BOOST_PARAMETER_HAS_PERFECT_FORWARDING | |
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41 | #endif |
42 | ||
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43 | #if defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING) |
44 | #if !defined(BOOST_PARAMETER_CAN_USE_MP11) && \ | |
45 | !defined(BOOST_PARAMETER_DISABLE_MP11_USAGE) && \ | |
46 | !defined(BOOST_NO_CXX11_CONSTEXPR) && \ | |
47 | !defined(BOOST_NO_CXX11_DECLTYPE_N3276) && \ | |
48 | !defined(BOOST_NO_CXX11_AUTO_DECLARATIONS) && \ | |
49 | !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES) && \ | |
50 | !defined(BOOST_NO_CXX11_STATIC_ASSERT) && \ | |
51 | !defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS) && \ | |
52 | !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST) && \ | |
53 | !defined(BOOST_NO_CXX11_HDR_TUPLE) | |
54 | // Boost.MP11 requires C++11. -- Cromwell D. Enage | |
55 | #define BOOST_PARAMETER_CAN_USE_MP11 | |
56 | #endif | |
57 | #if !defined(BOOST_PARAMETER_MAX_ARITY) | |
58 | // Unlike the variadic MPL sequences provided by Boost.Fusion, | |
59 | // boost::mpl::vector has a size limit. -- Cromwell D. Enage | |
60 | #include <boost/mpl/limits/vector.hpp> | |
61 | #define BOOST_PARAMETER_MAX_ARITY BOOST_MPL_LIMIT_VECTOR_SIZE | |
62 | #endif | |
63 | #else // !defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING) | |
64 | #if !defined(BOOST_PARAMETER_EXPONENTIAL_OVERLOAD_THRESHOLD_ARITY) | |
65 | #define BOOST_PARAMETER_EXPONENTIAL_OVERLOAD_THRESHOLD_ARITY 0 | |
66 | #endif | |
67 | #if !defined(BOOST_PARAMETER_COMPOSE_MAX_ARITY) | |
68 | #if BOOST_WORKAROUND(BOOST_MSVC, < 1800) || \ | |
69 | BOOST_WORKAROUND(BOOST_GCC, < 60000) | |
70 | // Some tests cause MSVC-11.0 and earlier to run out of heap space, | |
71 | // while some other tests cause GCC 5 and earlier to do the same, | |
72 | // if the value is set any higher. -- Cromwell D. Enage | |
73 | #define BOOST_PARAMETER_COMPOSE_MAX_ARITY 20 | |
74 | #else | |
75 | #define BOOST_PARAMETER_COMPOSE_MAX_ARITY 64 | |
76 | #endif | |
77 | #endif // BOOST_PARAMETER_COMPOSE_MAX_ARITY | |
78 | #if !defined(BOOST_PARAMETER_MAX_ARITY) | |
79 | #define BOOST_PARAMETER_MAX_ARITY 8 | |
80 | #endif | |
81 | #endif // BOOST_PARAMETER_HAS_PERFECT_FORWARDING | |
82 | #endif // include guard | |
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