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84 lines
3.7 KiB
84 lines
3.7 KiB
5 years ago
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// Copyright Daniel Wallin, David Abrahams 2005.
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// Copyright Cromwell D. Enage 2017.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PARAMETER_CONFIG_050403_HPP
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#define BOOST_PARAMETER_CONFIG_050403_HPP
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#include <boost/config.hpp>
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#include <boost/config/workaround.hpp>
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// Allow projects to #define BOOST_PARAMETER_DISABLE_PERFECT_FORWARDING to
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// turn off perfect forwarding as necessary. Otherwise, also require correct
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// SFINAE support, needed explicitly by tagged_argument & keyword & cast;
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// correct function template ordering, needed by the code generation macros;
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// rvalue references, needed throughout; variadic templates, needed by
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// parameters; function template default arguments, needed by the code
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// generation macros; and the ability to handle multiple parameter packs,
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// needed by parameters. Older versions of GCC either don't have the latter
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// ability or cannot disambiguate between keyword's overloaded
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// operators. Older versions of Clang either fail to compile due to
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// differences in length between parameter packs 'Args' and 'args' or fail at
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// runtime due to segmentation faults.
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// -- Cromwell D. Enage
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#if !defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING) && \
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!defined(BOOST_PARAMETER_DISABLE_PERFECT_FORWARDING) && \
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!defined(BOOST_NO_SFINAE) && \
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!defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING) && \
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!defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && \
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!defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && \
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!defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS) && \
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!BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) && !( \
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defined(BOOST_CLANG) && (1 == BOOST_CLANG) && ( \
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(__clang_major__ < 3) || ( \
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(3 == __clang_major__) && (__clang_minor__ < 2) \
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) \
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) \
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) && !BOOST_WORKAROUND(BOOST_GCC, < 40900)
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#define BOOST_PARAMETER_HAS_PERFECT_FORWARDING
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#endif
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#if defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING)
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#if !defined(BOOST_PARAMETER_CAN_USE_MP11) && \
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!defined(BOOST_PARAMETER_DISABLE_MP11_USAGE) && \
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!defined(BOOST_NO_CXX11_CONSTEXPR) && \
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!defined(BOOST_NO_CXX11_DECLTYPE_N3276) && \
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!defined(BOOST_NO_CXX11_AUTO_DECLARATIONS) && \
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!defined(BOOST_NO_CXX11_TEMPLATE_ALIASES) && \
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!defined(BOOST_NO_CXX11_STATIC_ASSERT) && \
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!defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS) && \
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!defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST) && \
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!defined(BOOST_NO_CXX11_HDR_TUPLE)
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// Boost.MP11 requires C++11. -- Cromwell D. Enage
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#define BOOST_PARAMETER_CAN_USE_MP11
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#endif
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#if !defined(BOOST_PARAMETER_MAX_ARITY)
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// Unlike the variadic MPL sequences provided by Boost.Fusion,
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// boost::mpl::vector has a size limit. -- Cromwell D. Enage
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#include <boost/mpl/limits/vector.hpp>
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#define BOOST_PARAMETER_MAX_ARITY BOOST_MPL_LIMIT_VECTOR_SIZE
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#endif
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#else // !defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING)
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#if !defined(BOOST_PARAMETER_EXPONENTIAL_OVERLOAD_THRESHOLD_ARITY)
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#define BOOST_PARAMETER_EXPONENTIAL_OVERLOAD_THRESHOLD_ARITY 0
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#endif
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#if !defined(BOOST_PARAMETER_COMPOSE_MAX_ARITY)
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1800) || \
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BOOST_WORKAROUND(BOOST_GCC, < 60000)
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// Some tests cause MSVC-11.0 and earlier to run out of heap space,
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// while some other tests cause GCC 5 and earlier to do the same,
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// if the value is set any higher. -- Cromwell D. Enage
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#define BOOST_PARAMETER_COMPOSE_MAX_ARITY 20
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#else
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#define BOOST_PARAMETER_COMPOSE_MAX_ARITY 64
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#endif
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#endif // BOOST_PARAMETER_COMPOSE_MAX_ARITY
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#if !defined(BOOST_PARAMETER_MAX_ARITY)
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#define BOOST_PARAMETER_MAX_ARITY 8
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#endif
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#endif // BOOST_PARAMETER_HAS_PERFECT_FORWARDING
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#endif // include guard
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