ceph/src/boost/boost/hana/config.hpp

   1 /*!
   2 @file
   3 Defines configuration macros used throughout the library.
   4
   5 @copyright Louis Dionne 2013-2017
   6 Distributed under the Boost Software License, Version 1.0.
   7 (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
   8  */
   9
  10 #ifndef BOOST_HANA_CONFIG_HPP
  11 #define BOOST_HANA_CONFIG_HPP
  12
  13 #include <boost/hana/version.hpp>
  14
  15
  16 //////////////////////////////////////////////////////////////////////////////
  17 // Detect the compiler
  18 //////////////////////////////////////////////////////////////////////////////
  19
  20 #if defined(_MSC_VER) && !defined(__clang__) // MSVC
  21     // This must be checked first, because otherwise it produces a fatal
  22     // error due to unrecognized #warning directives used below.
  23
  24 #   if _MSC_VER < 1915
  25 #       pragma message("Warning: the native Microsoft compiler is not supported due to lack of proper C++14 support.")
  26 #   else
  27         // 1. Active issues
  28         // Multiple copy/move ctors
  29 #       define BOOST_HANA_WORKAROUND_MSVC_MULTIPLECTOR_106654
  30
  31         // 2. Issues fixed in the development branch of MSVC
  32         // Forward declaration of class template member function returning decltype(auto)
  33 #       define BOOST_HANA_WORKAROUND_MSVC_DECLTYPEAUTO_RETURNTYPE_662735
  34
  35         // 3. Issues fixed conditionally
  36         // Requires __declspec(empty_bases)
  37         // Empty base optimization
  38 #       define BOOST_HANA_WORKAROUND_MSVC_EMPTYBASE
  39
  40         // Requires /experimental:preprocessor
  41         // Variadic macro expansion
  42 #       if !defined(_MSVC_TRADITIONAL) || _MSVC_TRADITIONAL
  43 #           define BOOST_HANA_WORKAROUND_MSVC_PREPROCESSOR_616033
  44 #       endif
  45 #   endif
  46
  47 #elif defined(__clang__) && defined(_MSC_VER) // Clang-cl (Clang for Windows)
  48
  49 #   define BOOST_HANA_CONFIG_CLANG BOOST_HANA_CONFIG_VERSION(               \
  50                     __clang_major__, __clang_minor__, __clang_patchlevel__)
  51
  52 #elif defined(__clang__) && defined(__apple_build_version__) // Apple's Clang
  53
  54 #   if __apple_build_version__ >= 6020049
  55 #       define BOOST_HANA_CONFIG_CLANG BOOST_HANA_CONFIG_VERSION(3, 6, 0)
  56 #   endif
  57
  58 #elif defined(__clang__) // genuine Clang
  59
  60 #   define BOOST_HANA_CONFIG_CLANG BOOST_HANA_CONFIG_VERSION(               \
  61                 __clang_major__, __clang_minor__, __clang_patchlevel__)
  62
  63 #elif defined(__GNUC__) // GCC
  64
  65 #   define BOOST_HANA_CONFIG_GCC BOOST_HANA_CONFIG_VERSION(                 \
  66                             __GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
  67
  68 #endif
  69
  70 //////////////////////////////////////////////////////////////////////////////
  71 // Check the compiler for general C++14 capabilities
  72 //////////////////////////////////////////////////////////////////////////////
  73 #if (__cplusplus < 201400)
  74 #   if defined(_MSC_VER)
  75 #       if _MSC_VER < 1915
  76 #           pragma message("Warning: Your compiler doesn't provide C++14 or higher capabilities. Try adding the compiler flag '-std=c++14' or '-std=c++1y'.")
  77 #       endif
  78 #   else
  79 #       warning "Your compiler doesn't provide C++14 or higher capabilities. Try adding the compiler flag '-std=c++14' or '-std=c++1y'."
  80 #   endif
  81 #endif
  82
  83 //////////////////////////////////////////////////////////////////////////////
  84 // Caveats and other compiler-dependent options
  85 //////////////////////////////////////////////////////////////////////////////
  86
  87 // `BOOST_HANA_CONFIG_HAS_CONSTEXPR_LAMBDA` enables some constructs requiring
  88 // `constexpr` lambdas, which are in the language starting with C++17.
  89 //
  90 // Always disabled for now because Clang only has partial support for them
  91 // (captureless lambdas only).
  92 #if defined(__cplusplus) && __cplusplus > 201402L
  93 #   define BOOST_HANA_CONSTEXPR_STATELESS_LAMBDA constexpr
  94 // #   define BOOST_HANA_CONFIG_HAS_CONSTEXPR_LAMBDA
  95 #else
  96 #   define BOOST_HANA_CONSTEXPR_STATELESS_LAMBDA /* nothing */
  97 #endif
  98
  99 // `BOOST_HANA_CONSTEXPR_LAMBDA` expands to `constexpr` if constexpr lambdas
 100 // are supported and to nothing otherwise.
 101 #if defined(BOOST_HANA_CONFIG_HAS_CONSTEXPR_LAMBDA)
 102 #   define BOOST_HANA_CONSTEXPR_LAMBDA constexpr
 103 #else
 104 #   define BOOST_HANA_CONSTEXPR_LAMBDA /* nothing */
 105 #endif
 106
 107 // `BOOST_HANA_INLINE_VARIABLE` expands to `inline` when C++17 inline variables
 108 // are supported, and to nothing otherwise. This allows marking global variables
 109 // defined in a header as `inline` to avoid potential ODR violations.
 110 #if defined(__cplusplus) && __cplusplus > 201402L
 111 #   define BOOST_HANA_INLINE_VARIABLE inline
 112 #else
 113 #   define BOOST_HANA_INLINE_VARIABLE /* nothing */
 114 #endif
 115
 116 //////////////////////////////////////////////////////////////////////////////
 117 // Library features and options that can be tweaked by users
 118 //////////////////////////////////////////////////////////////////////////////
 119
 120 #if defined(BOOST_HANA_DOXYGEN_INVOKED) || \
 121     (defined(NDEBUG) && !defined(BOOST_HANA_CONFIG_DISABLE_ASSERTIONS))
 122     //! @ingroup group-config
 123     //! Disables the `BOOST_HANA_*_ASSERT` macro & friends.
 124     //!
 125     //! When this macro is defined, the `BOOST_HANA_*_ASSERT` macro & friends
 126     //! are disabled, i.e. they expand to nothing.
 127     //!
 128     //! This macro is defined automatically when `NDEBUG` is defined. It can
 129     //! also be defined by users before including this header or defined on
 130     //! the command line.
 131 #   define BOOST_HANA_CONFIG_DISABLE_ASSERTIONS
 132 #endif
 133
 134 #if defined(BOOST_HANA_DOXYGEN_INVOKED)
 135     //! @ingroup group-config
 136     //! Disables concept checks in interface methods.
 137     //!
 138     //! When this macro is not defined (the default), tag-dispatched methods
 139     //! will make sure the arguments they are passed are models of the proper
 140     //! concept(s). This can be very helpful in catching programming errors,
 141     //! but it is also slightly less compile-time efficient. You should
 142     //! probably always leave the checks enabled (and hence never define this
 143     //! macro), except perhaps in translation units that are compiled very
 144     //! often but whose code using Hana is modified very rarely.
 145 #   define BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
 146 #endif
 147
 148 #if defined(BOOST_HANA_DOXYGEN_INVOKED)
 149     //! @ingroup group-config
 150     //! Enables usage of the "string literal operator template" GNU extension.
 151     //!
 152     //! That operator is not part of the language yet, but it is supported by
 153     //! both Clang and GCC. This operator allows Hana to provide the nice `_s`
 154     //! user-defined literal for creating compile-time strings.
 155     //!
 156     //! When this macro is not defined, the GNU extension will be not used
 157     //! by Hana. Because this is a non-standard extension, the macro is not
 158     //! defined by default.
 159 #   define BOOST_HANA_CONFIG_ENABLE_STRING_UDL
 160 #endif
 161
 162 #if defined(BOOST_HANA_DOXYGEN_INVOKED)
 163     //! @ingroup group-config
 164     //! Enables additional assertions and sanity checks to be done by Hana.
 165     //!
 166     //! When this macro is defined (it is __not defined__ by default),
 167     //! additional sanity checks may be done by Hana. These checks may
 168     //! be costly to perform, either in terms of compilation time or in
 169     //! terms of execution time. These checks may help debugging an
 170     //! application during its initial development, but they should not
 171     //! be enabled as part of the normal configuration.
 172 #   define BOOST_HANA_CONFIG_ENABLE_DEBUG_MODE
 173 #endif
 174
 175 #endif // !BOOST_HANA_CONFIG_HPP