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Add macro helper for generating structs

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Nikita Lisitsa 2022-06-13 01:01:13 +03:00
parent d4f299f277
commit 6d0a8cec55
1 changed files with 45 additions and 0 deletions
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45
libs/util/include/psemek/util/struct.hpp Normal file
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#pragma once
#include <boost/preprocessor/seq/for_each.hpp>
#include <boost/preprocessor/seq/for_each_i.hpp>
#include <boost/preprocessor/tuple/elem.hpp>
#include <boost/preprocessor/seq/variadic_seq_to_seq.hpp>
#include <boost/preprocessor/stringize.hpp>
#define psemek_declare_struct_detail_field(r, data, value) BOOST_PP_TUPLE_ELEM(0, value) BOOST_PP_TUPLE_ELEM(1, value);
#define psemek_declare_struct_detail_for_each(r, data, value) f(x.BOOST_PP_TUPLE_ELEM(1, value) );
#define psemek_declare_struct_detail_print(r, data, index, value) \
if (index > 0) s << ", "; \
s << BOOST_PP_STRINGIZE(BOOST_PP_TUPLE_ELEM(1, value)) << " = " << x.BOOST_PP_TUPLE_ELEM(1, value);
#define psemek_declare_struct_impl(name, values) \
struct name { \
BOOST_PP_SEQ_FOR_EACH(psemek_declare_struct_detail_field, _, values) \
}; \
template <typename F> \
void for_each(name & x, F && f) { \
BOOST_PP_SEQ_FOR_EACH(psemek_declare_struct_detail_for_each, _, values) \
} \
template <typename F> \
void for_each(name const & x, F && f) { \
BOOST_PP_SEQ_FOR_EACH(psemek_declare_struct_detail_for_each, _, values) \
} \
template <typename Stream> \
Stream & operator << (Stream & s, name const & x) { \
s << '{'; \
BOOST_PP_SEQ_FOR_EACH_I(psemek_declare_struct_detail_print, _, values) \
s << '}'; \
return s; \
} \
template <typename Stream> \
void write(Stream & s, name const & x) { \
for_each(x, [&](auto const & v){ write(s, v); }); \
} \
template <typename Stream> \
void read(Stream & s, name & x) { \
for_each(x, [&](auto & v){ read(s, v); }); \
}
#define psemek_declare_struct(name, values) psemek_declare_struct_impl(name, BOOST_PP_VARIADIC_SEQ_TO_SEQ(values))