186 lines
11 KiB
C++
186 lines
11 KiB
C++
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<%#
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This is an ERB [1] template file used to generate the
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<boost/hana/detail/struct_macros.hpp> header. The maximum
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number of members that can be handled by the macros can
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be controlled with the 'MAX_NUMBER_OF_MEMBERS' variable,
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which can be set when calling ERB to generate the header:
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export MAX_NUMBER_OF_MEMBERS=55; erb struct_macros.erb.hpp
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'MAX_NUMBER_OF_MEMBERS' must be <= 62, otherwise an error is triggered.
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In case 'MAX_NUMBER_OF_MEMBERS' is not specified, it defaults to 40.
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[1]: http://en.wikipedia.org/wiki/ERuby
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%>
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<%
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MAX_NUMBER_OF_MEMBERS = (ENV["MAX_NUMBER_OF_MEMBERS"] || 40).to_i
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raise "MAX_NUMBER_OF_MEMBERS must be <= 62" if MAX_NUMBER_OF_MEMBERS > 62
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%>
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/*!
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@file
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Defines the `BOOST_HANA_DEFINE_STRUCT`, `BOOST_HANA_ADAPT_STRUCT`, and
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`BOOST_HANA_ADAPT_ADT` macros.
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@copyright Louis Dionne 2013-2016
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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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//////////////////////////////////////////////////////////////////////////////
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// THIS FILE IS GENERATED FROM THE <boost/hana/detail/struct_macros.erb.hpp>
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// ERB TEMPLATE. DO NOT EDIT THIS FILE DIRECTLY.
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//
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// THE ERB TEMPLATE CONTAINS INFORMATION ABOUT HOW TO REGENERATE THIS FILE.
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//////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_HANA_DETAIL_STRUCT_MACROS_HPP
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#define BOOST_HANA_DETAIL_STRUCT_MACROS_HPP
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#include <boost/hana/config.hpp>
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#include <boost/hana/detail/preprocessor.hpp>
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#include <boost/hana/pair.hpp>
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#include <boost/hana/string.hpp>
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#include <boost/hana/tuple.hpp>
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#include <cstddef>
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#include <utility>
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BOOST_HANA_NAMESPACE_BEGIN namespace struct_detail {
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template <typename Memptr, Memptr ptr>
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struct member_ptr {
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template <typename T>
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constexpr decltype(auto) operator()(T&& t) const
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{ return static_cast<T&&>(t).*ptr; }
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};
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constexpr std::size_t strlen(char const* s) {
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std::size_t n = 0;
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while (*s++ != '\0')
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++n;
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return n;
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}
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template <std::size_t n, typename Names, std::size_t ...i>
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constexpr auto prepare_member_name_impl(std::index_sequence<i...>) {
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return hana::string_c<hana::at_c<n>(Names::get())[i]...>;
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}
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template <std::size_t n, typename Names>
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constexpr auto prepare_member_name() {
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constexpr std::size_t len = strlen(hana::at_c<n>(Names::get()));
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return prepare_member_name_impl<n, Names>(std::make_index_sequence<len>{});
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}
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} BOOST_HANA_NAMESPACE_END
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//////////////////////////////////////////////////////////////////////////////
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// BOOST_HANA_ADAPT_STRUCT
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//////////////////////////////////////////////////////////////////////////////
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template <typename ...>
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struct BOOST_HANA_ADAPT_STRUCT_must_be_called_in_the_global_namespace;
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#define BOOST_HANA_ADAPT_STRUCT(...) \
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template <> \
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struct BOOST_HANA_ADAPT_STRUCT_must_be_called_in_the_global_namespace<>; \
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BOOST_HANA_ADAPT_STRUCT_IMPL(BOOST_HANA_PP_NARG(__VA_ARGS__), __VA_ARGS__)\
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static_assert(true, "force the usage of a trailing semicolon") \
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/**/
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#define BOOST_HANA_ADAPT_STRUCT_IMPL(N, ...) \
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BOOST_HANA_PP_CONCAT(BOOST_HANA_ADAPT_STRUCT_IMPL_, N)(__VA_ARGS__)
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<% (0..MAX_NUMBER_OF_MEMBERS).each do |n| %>
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#define BOOST_HANA_ADAPT_STRUCT_IMPL_<%= n+1 %>(TYPE <%= (1..n).map { |i| ", m#{i}" }.join %>) \
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namespace boost { namespace hana { \
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template <> \
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struct accessors_impl<TYPE> { \
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static constexpr auto apply() { \
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struct member_names { \
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static constexpr auto get() { \
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return ::boost::hana::make_tuple( \
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<%= (1..n).map { |i| "BOOST_HANA_PP_STRINGIZE(m#{i})" }.join(', ') %> \
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); \
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} \
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}; \
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return ::boost::hana::make_tuple( \
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<%= (1..n).map { |i| "::boost::hana::make_pair(::boost::hana::struct_detail::prepare_member_name<#{i-1}, member_names>(), ::boost::hana::struct_detail::member_ptr<decltype(&TYPE::m#{i}), &TYPE::m#{i}>{})" }.join(', ') %>\
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); \
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} \
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}; \
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}} \
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/**/
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<% end %>
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//////////////////////////////////////////////////////////////////////////////
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// BOOST_HANA_ADAPT_ADT
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//////////////////////////////////////////////////////////////////////////////
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template <typename ...>
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struct BOOST_HANA_ADAPT_ADT_must_be_called_in_the_global_namespace;
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#define BOOST_HANA_ADAPT_ADT(...) \
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template <> \
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struct BOOST_HANA_ADAPT_ADT_must_be_called_in_the_global_namespace<>; \
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BOOST_HANA_ADAPT_ADT_IMPL(BOOST_HANA_PP_NARG(__VA_ARGS__), __VA_ARGS__) \
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static_assert(true, "force the usage of a trailing semicolon") \
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/**/
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#define BOOST_HANA_ADAPT_ADT_IMPL(N, ...) \
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BOOST_HANA_PP_CONCAT(BOOST_HANA_ADAPT_ADT_IMPL_, N)(__VA_ARGS__)
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<% (0..MAX_NUMBER_OF_MEMBERS).each do |n| %>
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#define BOOST_HANA_ADAPT_ADT_IMPL_<%= n+1 %>(TYPE <%= (1..n).map { |i| ", m#{i}" }.join %>) \
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namespace boost { namespace hana { \
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template <> \
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struct accessors_impl<TYPE> { \
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template <typename ...> \
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static constexpr auto apply() { \
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struct member_names { \
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static constexpr auto get() { \
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return ::boost::hana::make_tuple( \
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<%= (1..n).map { |i| "BOOST_HANA_PP_STRINGIZE(BOOST_HANA_PP_FRONT m#{i})" }.join(', ') %>\
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); \
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} \
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}; \
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return ::boost::hana::make_tuple( \
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<%= (1..n).map { |i| "::boost::hana::make_pair(::boost::hana::struct_detail::prepare_member_name<#{i-1}, member_names>(), BOOST_HANA_PP_DROP_FRONT m#{i})" }.join(', ') %>\
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); \
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} \
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}; \
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}} \
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/**/
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<% end %>
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//////////////////////////////////////////////////////////////////////////////
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// BOOST_HANA_DEFINE_STRUCT
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//////////////////////////////////////////////////////////////////////////////
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#define BOOST_HANA_DEFINE_STRUCT(...) \
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BOOST_HANA_DEFINE_STRUCT_IMPL(BOOST_HANA_PP_NARG(__VA_ARGS__), __VA_ARGS__)
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#define BOOST_HANA_DEFINE_STRUCT_IMPL(N, ...) \
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BOOST_HANA_PP_CONCAT(BOOST_HANA_DEFINE_STRUCT_IMPL_, N)(__VA_ARGS__)
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<% (0..MAX_NUMBER_OF_MEMBERS).each do |n| %>
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#define BOOST_HANA_DEFINE_STRUCT_IMPL_<%= n+1 %>(TYPE <%= (1..n).map { |i| ", m#{i}" }.join %>) \
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<%= (1..n).map { |i| "BOOST_HANA_PP_DROP_BACK m#{i} BOOST_HANA_PP_BACK m#{i};" }.join(' ') %> \
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\
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struct hana_accessors_impl { \
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static constexpr auto apply() { \
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struct member_names { \
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static constexpr auto get() { \
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return ::boost::hana::make_tuple( \
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<%= (1..n).map { |i| "BOOST_HANA_PP_STRINGIZE(BOOST_HANA_PP_BACK m#{i})" }.join(', ') %>\
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); \
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} \
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}; \
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return ::boost::hana::make_tuple( \
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<%= (1..n).map { |i| "::boost::hana::make_pair(::boost::hana::struct_detail::prepare_member_name<#{i-1}, member_names>(), ::boost::hana::struct_detail::member_ptr<decltype(&TYPE::BOOST_HANA_PP_BACK m#{i}), &TYPE::BOOST_HANA_PP_BACK m#{i}>{})" }.join(', ') %>\
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); \
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} \
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} \
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/**/
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<% end %>
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#endif // !BOOST_HANA_DETAIL_STRUCT_MACROS_HPP
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