ceph/src/boost/boost/parameter/config.hpp

   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
   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
  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
  41 #endif
  42
  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
  83