| 1 | // Copyright Daniel Wallin, David Abrahams 2005. |
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| 2 | // Copyright Cromwell D. Enage 2017. |
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| 3 | // Distributed under the Boost Software License, Version 1.0. |
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| 4 | // (See accompanying file LICENSE_1_0.txt or copy at |
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| 5 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 6 | |
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| 7 | #ifndef BOOST_PARAMETER_CONFIG_050403_HPP |
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| 8 | #define BOOST_PARAMETER_CONFIG_050403_HPP |
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| 9 | |
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| 10 | #include <boost/config.hpp> |
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| 11 | #include <boost/config/workaround.hpp> |
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| 12 | |
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| 13 | // Allow projects to #define BOOST_PARAMETER_DISABLE_PERFECT_FORWARDING to |
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| 14 | // turn off perfect forwarding as necessary. Otherwise, also require correct |
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| 15 | // SFINAE support, needed explicitly by tagged_argument & keyword & cast; |
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| 16 | // correct function template ordering, needed by the code generation macros; |
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| 17 | // rvalue references, needed throughout; variadic templates, needed by |
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| 18 | // parameters; function template default arguments, needed by the code |
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| 19 | // generation macros; and the ability to handle multiple parameter packs, |
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| 20 | // needed by parameters. Older versions of GCC either don't have the latter |
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| 21 | // ability or cannot disambiguate between keyword's overloaded |
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| 22 | // operators. Older versions of Clang either fail to compile due to |
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| 23 | // differences in length between parameter packs 'Args' and 'args' or fail at |
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| 24 | // runtime due to segmentation faults. |
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| 25 | // -- Cromwell D. Enage |
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| 26 | #if !defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING) && \ |
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| 27 | !defined(BOOST_PARAMETER_DISABLE_PERFECT_FORWARDING) && \ |
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| 28 | !defined(BOOST_NO_SFINAE) && \ |
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| 29 | !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING) && \ |
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| 30 | !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && \ |
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| 31 | !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && \ |
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| 32 | !defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS) && \ |
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| 33 | !BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x564)) && !( \ |
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| 34 | defined(BOOST_CLANG) && (1 == BOOST_CLANG) && ( \ |
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| 35 | (__clang_major__ < 3) || ( \ |
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| 36 | (3 == __clang_major__) && (__clang_minor__ < 2) \ |
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| 37 | ) \ |
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| 38 | ) \ |
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| 39 | ) && !BOOST_WORKAROUND(BOOST_GCC, < 40900) |
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| 40 | #define BOOST_PARAMETER_HAS_PERFECT_FORWARDING |
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| 41 | #endif |
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| 42 | |
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| 43 | #if defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING) |
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| 44 | #if !defined(BOOST_PARAMETER_CAN_USE_MP11) && \ |
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| 45 | !defined(BOOST_PARAMETER_DISABLE_MP11_USAGE) && \ |
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| 46 | !defined(BOOST_NO_CXX11_CONSTEXPR) && \ |
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| 47 | !defined(BOOST_NO_CXX11_DECLTYPE_N3276) && \ |
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| 48 | !defined(BOOST_NO_CXX11_AUTO_DECLARATIONS) && \ |
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| 49 | !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES) && \ |
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| 50 | !defined(BOOST_NO_CXX11_STATIC_ASSERT) && \ |
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| 51 | !defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS) && \ |
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| 52 | !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST) && \ |
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| 53 | !defined(BOOST_NO_CXX11_HDR_TUPLE) |
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| 54 | // Boost.MP11 requires C++11. -- Cromwell D. Enage |
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| 55 | #define BOOST_PARAMETER_CAN_USE_MP11 |
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| 56 | #endif |
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| 57 | #if !defined(BOOST_PARAMETER_MAX_ARITY) |
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| 58 | // Unlike the variadic MPL sequences provided by Boost.Fusion, |
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| 59 | // boost::mpl::vector has a size limit. -- Cromwell D. Enage |
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| 60 | #include <boost/mpl/limits/vector.hpp> |
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| 61 | #define BOOST_PARAMETER_MAX_ARITY BOOST_MPL_LIMIT_VECTOR_SIZE |
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| 62 | #endif |
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| 63 | #else // !defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING) |
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| 64 | #if !defined(BOOST_PARAMETER_EXPONENTIAL_OVERLOAD_THRESHOLD_ARITY) |
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| 65 | #define BOOST_PARAMETER_EXPONENTIAL_OVERLOAD_THRESHOLD_ARITY 0 |
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| 66 | #endif |
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| 67 | #if !defined(BOOST_PARAMETER_COMPOSE_MAX_ARITY) |
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| 68 | #if BOOST_WORKAROUND(BOOST_MSVC, < 1800) || \ |
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| 69 | BOOST_WORKAROUND(BOOST_GCC, < 60000) |
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| 70 | // Some tests cause MSVC-11.0 and earlier to run out of heap space, |
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| 71 | // while some other tests cause GCC 5 and earlier to do the same, |
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| 72 | // if the value is set any higher. -- Cromwell D. Enage |
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| 73 | #define BOOST_PARAMETER_COMPOSE_MAX_ARITY 20 |
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| 74 | #else |
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| 75 | #define BOOST_PARAMETER_COMPOSE_MAX_ARITY 64 |
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| 76 | #endif |
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| 77 | #endif // BOOST_PARAMETER_COMPOSE_MAX_ARITY |
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| 78 | #if !defined(BOOST_PARAMETER_MAX_ARITY) |
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| 79 | #define BOOST_PARAMETER_MAX_ARITY 8 |
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| 80 | #endif |
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| 81 | #endif // BOOST_PARAMETER_HAS_PERFECT_FORWARDING |
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| 82 | #endif // include guard |
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| 83 | |
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| 84 | |
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