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+<%#
+ This is an ERB [1] template file used to generate the
+ <boost/hana/detail/struct_macros.hpp> header. The maximum
+ number of members that can be handled by the macros can
+ be controlled with the 'MAX_NUMBER_OF_MEMBERS' variable,
+ which can be set when calling ERB to generate the header:
+
+ export MAX_NUMBER_OF_MEMBERS=55; erb struct_macros.hpp.erb
+
+ 'MAX_NUMBER_OF_MEMBERS' must be <= 62, otherwise an error is triggered.
+ In case 'MAX_NUMBER_OF_MEMBERS' is not specified, it defaults to 40.
+
+ [1]: http://en.wikipedia.org/wiki/ERuby
+%>
+
+<%
+ MAX_NUMBER_OF_MEMBERS = (ENV["MAX_NUMBER_OF_MEMBERS"] || 40).to_i
+ raise "MAX_NUMBER_OF_MEMBERS must be <= 62" if MAX_NUMBER_OF_MEMBERS > 62
+%>
+
+/*!
+@file
+Defines the `BOOST_HANA_DEFINE_STRUCT`, `BOOST_HANA_ADAPT_STRUCT`, and
+`BOOST_HANA_ADAPT_ADT` macros.
+
+@copyright Louis Dionne 2013-2017
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
+ */
+
+//////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS GENERATED FROM THE <boost/hana/detail/struct_macros.erb.hpp>
+// ERB TEMPLATE. DO NOT EDIT THIS FILE DIRECTLY.
+//
+// THE ERB TEMPLATE CONTAINS INFORMATION ABOUT HOW TO REGENERATE THIS FILE.
+//////////////////////////////////////////////////////////////////////////////
+
+#ifndef BOOST_HANA_DETAIL_STRUCT_MACROS_HPP
+#define BOOST_HANA_DETAIL_STRUCT_MACROS_HPP
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/detail/preprocessor.hpp>
+#include <boost/hana/pair.hpp>
+#include <boost/hana/string.hpp>
+#include <boost/hana/tuple.hpp>
+
+#include <cstddef>
+#include <utility>
+
+
+BOOST_HANA_NAMESPACE_BEGIN namespace struct_detail {
+ template <typename Memptr, Memptr ptr>
+ struct member_ptr {
+ template <typename T>
+ constexpr decltype(auto) operator()(T&& t) const
+ { return static_cast<T&&>(t).*ptr; }
+ };
+
+ constexpr std::size_t strlen(char const* s) {
+ std::size_t n = 0;
+ while (*s++ != '\0')
+ ++n;
+ return n;
+ }
+
+ template <std::size_t n, typename Names, std::size_t ...i>
+ constexpr auto prepare_member_name_impl(std::index_sequence<i...>) {
+ return hana::string_c<hana::at_c<n>(Names::get())[i]...>;
+ }
+
+ template <std::size_t n, typename Names>
+ constexpr auto prepare_member_name() {
+ constexpr std::size_t len = strlen(hana::at_c<n>(Names::get()));
+ return prepare_member_name_impl<n, Names>(std::make_index_sequence<len>{});
+ }
+} BOOST_HANA_NAMESPACE_END
+
+//////////////////////////////////////////////////////////////////////////////
+// BOOST_HANA_ADAPT_STRUCT
+//////////////////////////////////////////////////////////////////////////////
+template <typename ...>
+struct BOOST_HANA_ADAPT_STRUCT_must_be_called_in_the_global_namespace;
+
+#define BOOST_HANA_ADAPT_STRUCT(...) \
+ template <> \
+ struct BOOST_HANA_ADAPT_STRUCT_must_be_called_in_the_global_namespace<>; \
+ BOOST_HANA_ADAPT_STRUCT_IMPL(BOOST_HANA_PP_NARG(__VA_ARGS__), __VA_ARGS__)\
+ static_assert(true, "force the usage of a trailing semicolon") \
+/**/
+
+#define BOOST_HANA_ADAPT_STRUCT_IMPL(N, ...) \
+ BOOST_HANA_PP_CONCAT(BOOST_HANA_ADAPT_STRUCT_IMPL_, N)(__VA_ARGS__)
+
+<% (0..MAX_NUMBER_OF_MEMBERS).each do |n| %>
+#define BOOST_HANA_ADAPT_STRUCT_IMPL_<%= n+1 %>(TYPE <%= (1..n).map { |i| ", m#{i}" }.join %>) \
+ namespace boost { namespace hana { \
+ template <> \
+ struct accessors_impl<TYPE> { \
+ static constexpr auto apply() { \
+ struct member_names { \
+ static constexpr auto get() { \
+ return ::boost::hana::make_tuple( \
+ <%= (1..n).map { |i| "BOOST_HANA_PP_STRINGIZE(m#{i})" }.join(', ') %> \
+ ); \
+ } \
+ }; \
+ return ::boost::hana::make_tuple( \
+ <%= (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(', ') %>\
+ ); \
+ } \
+ }; \
+ }} \
+/**/
+<% end %>
+
+//////////////////////////////////////////////////////////////////////////////
+// BOOST_HANA_ADAPT_ADT
+//////////////////////////////////////////////////////////////////////////////
+template <typename ...>
+struct BOOST_HANA_ADAPT_ADT_must_be_called_in_the_global_namespace;
+
+#define BOOST_HANA_ADAPT_ADT(...) \
+ template <> \
+ struct BOOST_HANA_ADAPT_ADT_must_be_called_in_the_global_namespace<>; \
+ BOOST_HANA_ADAPT_ADT_IMPL(BOOST_HANA_PP_NARG(__VA_ARGS__), __VA_ARGS__) \
+ static_assert(true, "force the usage of a trailing semicolon") \
+/**/
+
+#define BOOST_HANA_ADAPT_ADT_IMPL(N, ...) \
+ BOOST_HANA_PP_CONCAT(BOOST_HANA_ADAPT_ADT_IMPL_, N)(__VA_ARGS__)
+
+<% (0..MAX_NUMBER_OF_MEMBERS).each do |n| %>
+#define BOOST_HANA_ADAPT_ADT_IMPL_<%= n+1 %>(TYPE <%= (1..n).map { |i| ", m#{i}" }.join %>) \
+ namespace boost { namespace hana { \
+ template <> \
+ struct accessors_impl<TYPE> { \
+ template <typename ...> \
+ static constexpr auto apply() { \
+ struct member_names { \
+ static constexpr auto get() { \
+ return ::boost::hana::make_tuple( \
+ <%= (1..n).map { |i| "BOOST_HANA_PP_STRINGIZE(BOOST_HANA_PP_FRONT m#{i})" }.join(', ') %>\
+ ); \
+ } \
+ }; \
+ return ::boost::hana::make_tuple( \
+ <%= (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(', ') %>\
+ ); \
+ } \
+ }; \
+ }} \
+/**/
+<% end %>
+
+//////////////////////////////////////////////////////////////////////////////
+// BOOST_HANA_DEFINE_STRUCT
+//////////////////////////////////////////////////////////////////////////////
+#define BOOST_HANA_DEFINE_STRUCT(...) \
+ BOOST_HANA_DEFINE_STRUCT_IMPL(BOOST_HANA_PP_NARG(__VA_ARGS__), __VA_ARGS__)
+
+#define BOOST_HANA_DEFINE_STRUCT_IMPL(N, ...) \
+ BOOST_HANA_PP_CONCAT(BOOST_HANA_DEFINE_STRUCT_IMPL_, N)(__VA_ARGS__)
+
+<% (0..MAX_NUMBER_OF_MEMBERS).each do |n| %>
+#define BOOST_HANA_DEFINE_STRUCT_IMPL_<%= n+1 %>(TYPE <%= (1..n).map { |i| ", m#{i}" }.join %>) \
+ <%= (1..n).map { |i| "BOOST_HANA_PP_DROP_BACK m#{i} BOOST_HANA_PP_BACK m#{i};" }.join(' ') %> \
+ \
+ struct hana_accessors_impl { \
+ static constexpr auto apply() { \
+ struct member_names { \
+ static constexpr auto get() { \
+ return ::boost::hana::make_tuple( \
+ <%= (1..n).map { |i| "BOOST_HANA_PP_STRINGIZE(BOOST_HANA_PP_BACK m#{i})" }.join(', ') %>\
+ ); \
+ } \
+ }; \
+ return ::boost::hana::make_tuple( \
+ <%= (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(', ') %>\
+ ); \
+ } \
+ } \
+/**/
+<% end %>
+
+#endif // !BOOST_HANA_DETAIL_STRUCT_MACROS_HPP