(por enquanto, estou trabalhando em uma macro estúpida ...)
Sim, eu também fui por esse caminho. Aqui está sua macro:
// detail/move_default.hpp
#ifndef UTILITY_DETAIL_MOVE_DEFAULT_HPP
#define UTILITY_DETAIL_MOVE_DEFAULT_HPP
#include <boost/preprocessor.hpp>
#define UTILITY_MOVE_DEFAULT_DETAIL_CONSTRUCTOR_BASE(pR, pData, pBase) pBase(std::move(pOther))
#define UTILITY_MOVE_DEFAULT_DETAIL_ASSIGNMENT_BASE(pR, pData, pBase) pBase::operator=(std::move(pOther));
#define UTILITY_MOVE_DEFAULT_DETAIL_CONSTRUCTOR(pR, pData, pMember) pMember(std::move(pOther.pMember))
#define UTILITY_MOVE_DEFAULT_DETAIL_ASSIGNMENT(pR, pData, pMember) pMember = std::move(pOther.pMember);
#define UTILITY_MOVE_DEFAULT_DETAIL(pT, pBases, pMembers) \
pT(pT&& pOther) : \
BOOST_PP_SEQ_ENUM(BOOST_PP_SEQ_TRANSFORM( \
UTILITY_MOVE_DEFAULT_DETAIL_CONSTRUCTOR_BASE, BOOST_PP_EMPTY, pBases)) \
, \
BOOST_PP_SEQ_ENUM(BOOST_PP_SEQ_TRANSFORM( \
UTILITY_MOVE_DEFAULT_DETAIL_CONSTRUCTOR, BOOST_PP_EMPTY, pMembers)) \
{} \
\
pT& operator=(pT&& pOther) \
{ \
BOOST_PP_SEQ_FOR_EACH(UTILITY_MOVE_DEFAULT_DETAIL_ASSIGNMENT_BASE, BOOST_PP_EMPTY, pBases) \
BOOST_PP_SEQ_FOR_EACH(UTILITY_MOVE_DEFAULT_DETAIL_ASSIGNMENT, BOOST_PP_EMPTY, pMembers) \
\
return *this; \
}
#define UTILITY_MOVE_DEFAULT_BASES_DETAIL(pT, pBases) \
pT(pT&& pOther) : \
BOOST_PP_SEQ_ENUM(BOOST_PP_SEQ_TRANSFORM( \
UTILITY_MOVE_DEFAULT_DETAIL_CONSTRUCTOR_BASE, BOOST_PP_EMPTY, pBases)) \
{} \
\
pT& operator=(pT&& pOther) \
{ \
BOOST_PP_SEQ_FOR_EACH(UTILITY_MOVE_DEFAULT_DETAIL_ASSIGNMENT_BASE, BOOST_PP_EMPTY, pBases) \
\
return *this; \
}
#define UTILITY_MOVE_DEFAULT_MEMBERS_DETAIL(pT, pMembers) \
pT(pT&& pOther) : \
BOOST_PP_SEQ_ENUM(BOOST_PP_SEQ_TRANSFORM( \
UTILITY_MOVE_DEFAULT_DETAIL_CONSTRUCTOR, BOOST_PP_EMPTY, pMembers)) \
{} \
\
pT& operator=(pT&& pOther) \
{ \
BOOST_PP_SEQ_FOR_EACH(UTILITY_MOVE_DEFAULT_DETAIL_ASSIGNMENT, BOOST_PP_EMPTY, pMembers) \
\
return *this; \
}
#endif
// move_default.hpp
#ifndef UTILITY_MOVE_DEFAULT_HPP
#define UTILITY_MOVE_DEFAULT_HPP
#include "utility/detail/move_default.hpp"
// move bases and members
#define UTILITY_MOVE_DEFAULT(pT, pBases, pMembers) UTILITY_MOVE_DEFAULT_DETAIL(pT, pBases, pMembers)
// base only version
#define UTILITY_MOVE_DEFAULT_BASES(pT, pBases) UTILITY_MOVE_DEFAULT_BASES_DETAIL(pT, pBases)
// member only version
#define UTILITY_MOVE_DEFAULT_MEMBERS(pT, pMembers) UTILITY_MOVE_DEFAULT_MEMBERS_DETAIL(pT, pMembers)
#endif
(Eu removi os comentários reais, que são longos e documentais.)
Você especifica as bases e / ou membros em sua classe como uma lista de pré-processador, por exemplo:
#include "move_default.hpp"
struct foo
{
UTILITY_MOVE_DEFAULT_MEMBERS(foo, (x)(str));
int x;
std::string str;
};
struct bar : foo, baz
{
UTILITY_MOVE_DEFAULT_BASES(bar, (foo)(baz));
};
struct baz : bar
{
UTILITY_MOVE_DEFAULT(baz, (bar), (ptr));
void* ptr;
};
E surge um construtor de movimento e um operador de atribuição de movimento.
(À parte, se alguém souber como posso combinar os detalhes em uma macro, isso seria ótimo.)