目前,我正在处理一个愚蠢的宏...
是的,我也曾经走过这条路。以下是您的宏:
#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
// move bases and members
// base only version
// member only version
你可以通过预处理器列表指定类中的基类和/或成员,例如:
#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;
};
然后就出现了移动构造函数和移动赋值运算符。
顺带一提,如果有人知道如何将细节合并成一个宏,那会很棒。
MyClass::MyClass(Myclass &&) = default;
吗? - Sandburg