/*!
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@file
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Defines configuration macros used throughout the library.
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@copyright Louis Dionne 2013-2017
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_HANA_CONFIG_HPP
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#define BOOST_HANA_CONFIG_HPP
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#include <boost/hana/version.hpp>
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//////////////////////////////////////////////////////////////////////////////
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// Detect the compiler
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//////////////////////////////////////////////////////////////////////////////
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#if defined(_MSC_VER) && !defined(__clang__) // MSVC
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// This must be checked first, because otherwise it produces a fatal
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// error due to unrecognized #warning directives used below.
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# if _MSC_VER < 1915
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# pragma message("Warning: the native Microsoft compiler is not supported due to lack of proper C++14 support.")
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# else
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// 1. Active issues
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// Multiple copy/move ctors
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# define BOOST_HANA_WORKAROUND_MSVC_MULTIPLECTOR_106654
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// 2. Issues fixed in the development branch of MSVC
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// Forward declaration of class template member function returning decltype(auto)
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# define BOOST_HANA_WORKAROUND_MSVC_DECLTYPEAUTO_RETURNTYPE_662735
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// 3. Issues fixed conditionally
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// Requires __declspec(empty_bases)
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// Empty base optimization
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# define BOOST_HANA_WORKAROUND_MSVC_EMPTYBASE
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// Requires /experimental:preprocessor
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// Variadic macro expansion
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# if !defined(_MSVC_TRADITIONAL) || _MSVC_TRADITIONAL
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# define BOOST_HANA_WORKAROUND_MSVC_PREPROCESSOR_616033
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# endif
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# endif
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#elif defined(__clang__) && defined(_MSC_VER) // Clang-cl (Clang for Windows)
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# define BOOST_HANA_CONFIG_CLANG BOOST_HANA_CONFIG_VERSION( \
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__clang_major__, __clang_minor__, __clang_patchlevel__)
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#elif defined(__clang__) && defined(__apple_build_version__) // Apple's Clang
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# if __apple_build_version__ >= 6020049
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# define BOOST_HANA_CONFIG_CLANG BOOST_HANA_CONFIG_VERSION(3, 6, 0)
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# endif
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#elif defined(__clang__) // genuine Clang
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# define BOOST_HANA_CONFIG_CLANG BOOST_HANA_CONFIG_VERSION( \
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__clang_major__, __clang_minor__, __clang_patchlevel__)
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#elif defined(__GNUC__) // GCC
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# define BOOST_HANA_CONFIG_GCC BOOST_HANA_CONFIG_VERSION( \
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__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
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#endif
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//////////////////////////////////////////////////////////////////////////////
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// Check the compiler for general C++14 capabilities
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//////////////////////////////////////////////////////////////////////////////
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#if (__cplusplus < 201400)
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# if defined(_MSC_VER)
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# if _MSC_VER < 1915
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# 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'.")
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# endif
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# else
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# warning "Your compiler doesn't provide C++14 or higher capabilities. Try adding the compiler flag '-std=c++14' or '-std=c++1y'."
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# endif
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#endif
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//////////////////////////////////////////////////////////////////////////////
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// Caveats and other compiler-dependent options
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//////////////////////////////////////////////////////////////////////////////
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// `BOOST_HANA_CONFIG_HAS_CONSTEXPR_LAMBDA` enables some constructs requiring
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// `constexpr` lambdas, which are in the language starting with C++17.
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//
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// Always disabled for now because Clang only has partial support for them
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// (captureless lambdas only).
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#if defined(__cplusplus) && __cplusplus > 201402L
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# define BOOST_HANA_CONSTEXPR_STATELESS_LAMBDA constexpr
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// # define BOOST_HANA_CONFIG_HAS_CONSTEXPR_LAMBDA
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#else
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# define BOOST_HANA_CONSTEXPR_STATELESS_LAMBDA /* nothing */
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#endif
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// `BOOST_HANA_CONSTEXPR_LAMBDA` expands to `constexpr` if constexpr lambdas
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// are supported and to nothing otherwise.
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#if defined(BOOST_HANA_CONFIG_HAS_CONSTEXPR_LAMBDA)
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# define BOOST_HANA_CONSTEXPR_LAMBDA constexpr
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#else
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# define BOOST_HANA_CONSTEXPR_LAMBDA /* nothing */
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#endif
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//////////////////////////////////////////////////////////////////////////////
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// Namespace macros
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//////////////////////////////////////////////////////////////////////////////
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#define BOOST_HANA_NAMESPACE_BEGIN namespace boost { namespace hana {
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#define BOOST_HANA_NAMESPACE_END }}
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//////////////////////////////////////////////////////////////////////////////
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// Library features and options that can be tweaked by users
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//////////////////////////////////////////////////////////////////////////////
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#if defined(BOOST_HANA_DOXYGEN_INVOKED) || \
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(defined(NDEBUG) && !defined(BOOST_HANA_CONFIG_DISABLE_ASSERTIONS))
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//! @ingroup group-config
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//! Disables the `BOOST_HANA_*_ASSERT` macro & friends.
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//!
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//! When this macro is defined, the `BOOST_HANA_*_ASSERT` macro & friends
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//! are disabled, i.e. they expand to nothing.
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//!
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//! This macro is defined automatically when `NDEBUG` is defined. It can
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//! also be defined by users before including this header or defined on
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//! the command line.
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# define BOOST_HANA_CONFIG_DISABLE_ASSERTIONS
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#endif
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#if defined(BOOST_HANA_DOXYGEN_INVOKED)
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//! @ingroup group-config
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//! Disables concept checks in interface methods.
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//!
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//! When this macro is not defined (the default), tag-dispatched methods
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//! will make sure the arguments they are passed are models of the proper
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//! concept(s). This can be very helpful in catching programming errors,
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//! but it is also slightly less compile-time efficient. You should
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//! probably always leave the checks enabled (and hence never define this
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//! macro), except perhaps in translation units that are compiled very
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//! often but whose code using Hana is modified very rarely.
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# define BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
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#endif
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#if defined(BOOST_HANA_DOXYGEN_INVOKED)
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//! @ingroup group-config
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//! Enables usage of the "string literal operator template" GNU extension.
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//!
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//! That operator is not part of the language yet, but it is supported by
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//! both Clang and GCC. This operator allows Hana to provide the nice `_s`
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//! user-defined literal for creating compile-time strings.
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//!
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//! When this macro is not defined, the GNU extension will be not used
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//! by Hana. Because this is a non-standard extension, the macro is not
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//! defined by default.
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# define BOOST_HANA_CONFIG_ENABLE_STRING_UDL
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#endif
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#if defined(BOOST_HANA_DOXYGEN_INVOKED)
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//! @ingroup group-config
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//! Enables additional assertions and sanity checks to be done by Hana.
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//!
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//! When this macro is defined (it is __not defined__ by default),
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//! additional sanity checks may be done by Hana. These checks may
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//! be costly to perform, either in terms of compilation time or in
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//! terms of execution time. These checks may help debugging an
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//! application during its initial development, but they should not
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//! be enabled as part of the normal configuration.
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# define BOOST_HANA_CONFIG_ENABLE_DEBUG_MODE
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#endif
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#endif // !BOOST_HANA_CONFIG_HPP
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