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Memberwise.h
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/*
* File: Memberwise.h
* Author: michal
*
* Created on March 3, 2016, 12:03 AM
*/
#ifndef MEMBERWISE_H
#define MEMBERWISE_H
#include <boost/preprocessor/seq/for_each.hpp>
#include <boost/preprocessor/variadic/to_seq.hpp>
template <class X, X value_>
struct member_ptr
{
member_ptr(const char *name) : name(name) {}
static constexpr X get() { return value_; }
const char *name;
};
#define MEMBER(type, member) member_ptr<decltype(&type::member), &type::member>(#member)
template <class... members>
struct member_ptr_list
{
};
template <>
struct member_ptr_list<>
{
};
template <class... previous, class member_ptr_t, member_ptr_t ptr>
member_ptr_list<previous..., member_ptr<member_ptr_t, ptr>> operator,(member_ptr_list<previous...>, member_ptr<member_ptr_t, ptr>)
{
return {};
}
template <class member_ptr1, member_ptr1 ptr1, class member_ptr2, member_ptr2 ptr2>
member_ptr_list<member_ptr<member_ptr1, ptr1>, member_ptr<member_ptr2, ptr2>> operator,(member_ptr<member_ptr1, ptr1>, member_ptr<member_ptr2, ptr2>)
{
return {};
}
template <class target, class functor>
constexpr void apply(member_ptr_list<>, functor f, target &tgt)
{}
template <class target, class member0, class... members, class functor>
void apply(member_ptr_list<member0, members...>, functor f, target &tgt)
{
f(tgt.*member0::get());
apply(member_ptr_list<members...>(), f, tgt);
}
template <class target, class functor>
constexpr void apply(member_ptr_list<>, functor f, target &tgt1, target &tgt2)
{}
template <class target, class member0, class... members, class functor>
void apply(member_ptr_list<member0, members...>, functor f, target &tgt1, target &tgt2)
{
f(tgt1.*member0::get(), tgt2.*member0::get());
apply(member_ptr_list<members...>(), f, tgt1, tgt2);
}
template <class target, class functor>
constexpr void apply(member_ptr_list<>, functor f, target &tgt1, target &tgt2, target &tgt3)
{}
template <class target, class member0, class... members, class functor>
void apply(member_ptr_list<member0, members...>, functor f, target &tgt1, target &tgt2, target &tgt3)
{
f(tgt1.*member0::get(), tgt2.*member0::get(), tgt3.*member0::get());
apply(member_ptr_list<members...>(), f, tgt1, tgt2, tgt3);
}
template <class type, class purpose_tag = void>
struct member_list : member_ptr_list<> {};
template <class purpose_tag = void, class target, class functor>
void memberwise(functor f, const target &tgt)
{
apply(member_list<target, purpose_tag>(), f, tgt);
}
template <class purpose_tag = void, class target, class functor>
void memberwise(functor f, target &tgt)
{
apply(member_list<target, purpose_tag>(), f, tgt);
}
template <class purpose_tag = void, class target, class functor>
void memberwise(functor f, const target &tgt1, const target &tgt2)
{
apply(member_list<target, purpose_tag>(), f, tgt1, tgt2);
}
template <class purpose_tag = void, class target, class functor>
void memberwise(functor f, target &tgt1, target &tgt2)
{
apply(member_list<target, purpose_tag>(), f, tgt1, tgt2);
}
template <class purpose_tag = void, class target, class functor>
void memberwise(functor f, const target &tgt1, const target &tgt2, const target &tgt3)
{
apply(member_list<target, purpose_tag>(), f, tgt1, tgt2, tgt3);
}
template <class purpose_tag = void, class target, class functor>
void memberwise(functor f, target &tgt1, target &tgt2, target &tgt3)
{
apply(member_list<target, purpose_tag>(), f, tgt1, tgt2, tgt3);
}
#define MEMBER_LIST_ELEM(unused, type, x) , MEMBER(type, x)
#define MEMBER_LIST_ARGS(Type, ...) BOOST_PP_SEQ_FOR_EACH(MEMBER_LIST_ELEM, Type, BOOST_PP_VARIADIC_TO_SEQ(__VA_ARGS__))
#define MEMBER_LIST(Type, ...) template <> struct member_list<Type> : decltype(member_ptr_list<>() MEMBER_LIST_ARGS(Type, __VA_ARGS__)) {}
#define MEMBER_LIST_PURPOSE(Purpose, Type, ...) template <> struct member_list<Type, Purpose> : decltype(member_ptr_list<>() MEMBER_LIST_ARGS(Type, __VA_ARGS__)) {}
#endif /* MEMBERWISE_H */