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