90 lines
3.4 KiB
C++
90 lines
3.4 KiB
C++
/*
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@Copyright Barrett Adair 2016-2017
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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_CLBL_TRTS_SFINAE_ERRORS_HPP
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#define BOOST_CLBL_TRTS_SFINAE_ERRORS_HPP
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#include <boost/callable_traits/detail/config.hpp>
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namespace boost { namespace callable_traits { namespace detail {
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struct sfinae_error{};
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template<typename T>
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struct success {
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static constexpr bool value = true;
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struct _ { using type = T; };
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};
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template<bool B, typename T>
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struct fail_if : T {
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static_assert(std::is_base_of<sfinae_error, T>::value,
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"incorrect usage of fail_if");
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static constexpr bool value = B;
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};
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template<typename T, typename... FailIfs>
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using sfinae_try = typename BOOST_CLBL_TRTS_DISJUNCTION(
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FailIfs..., success<T>)::_::type;
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template<typename FailMsg, typename ForceTwoPhaseLookup>
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struct fail {
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using type = typename std::conditional<std::is_same<ForceTwoPhaseLookup, std::false_type>::value,
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FailMsg, FailMsg>::type::_::type;
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};
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}}} // namespace boost::callable_traits::detail
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#define BOOST_CLBL_TRTS_PP_CAT_(x, y) x ## y
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#define BOOST_CLBL_TRTS_PP_CAT(x, y) BOOST_CLBL_TRTS_PP_CAT_(x, y)
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#define BOOST_CLBL_TRTS_DEFINE_SFINAE_ERROR_ORIGIN(origin) \
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namespace error { \
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template<typename ErrorMessage> \
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struct origin : \
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::boost::callable_traits::detail::sfinae_error \
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{ struct _ {}; }; \
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} \
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/**/
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#define BOOST_CLBL_TRTS_SFINAE_MSG(origin, name) \
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struct BOOST_CLBL_TRTS_PP_CAT(name, _ ){}; \
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struct name : error::origin< \
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BOOST_CLBL_TRTS_PP_CAT(name, _ )>{}; \
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/**/
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namespace boost { namespace callable_traits {
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BOOST_CLBL_TRTS_DEFINE_SFINAE_ERROR_ORIGIN(parameters)
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BOOST_CLBL_TRTS_SFINAE_MSG(parameters, index_out_of_range_for_parameter_list)
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BOOST_CLBL_TRTS_SFINAE_MSG(parameters, cannot_determine_parameters_for_this_type)
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BOOST_CLBL_TRTS_DEFINE_SFINAE_ERROR_ORIGIN(varargs)
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BOOST_CLBL_TRTS_SFINAE_MSG(varargs, varargs_are_illegal_for_this_type)
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BOOST_CLBL_TRTS_DEFINE_SFINAE_ERROR_ORIGIN(member_qualifiers)
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BOOST_CLBL_TRTS_SFINAE_MSG(member_qualifiers, member_qualifiers_are_illegal_for_this_type)
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BOOST_CLBL_TRTS_SFINAE_MSG(member_qualifiers, this_compiler_doesnt_support_abominable_function_types)
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BOOST_CLBL_TRTS_DEFINE_SFINAE_ERROR_ORIGIN(transaction_safe_)
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BOOST_CLBL_TRTS_SFINAE_MSG(transaction_safe_, transaction_safe_is_not_supported_by_this_configuration)
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BOOST_CLBL_TRTS_DEFINE_SFINAE_ERROR_ORIGIN(expand_args)
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BOOST_CLBL_TRTS_SFINAE_MSG(expand_args, cannot_expand_the_parameter_list_of_first_template_argument)
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BOOST_CLBL_TRTS_DEFINE_SFINAE_ERROR_ORIGIN(member_pointer_required)
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BOOST_CLBL_TRTS_SFINAE_MSG(member_pointer_required, type_is_not_a_member_pointer)
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BOOST_CLBL_TRTS_DEFINE_SFINAE_ERROR_ORIGIN(reference_error)
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BOOST_CLBL_TRTS_SFINAE_MSG(reference_error, reference_type_not_supported_by_this_metafunction)
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}} // namespace boost::callable_traits
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#endif // #ifndef BOOST_CLBL_TRTS_SFINAE_ERRORS_HPP
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