这时需要使用 std::forward<T>(),保留参数的左/右值特性。 voidforward(int&&i) { cout<<"forward(int&&):"<< i <<","; process(std::forward<int>(i)); }intmain() {inta =0; forward(2);//forward(int&&): 2, process(int&&): 2forward(move(a));//forward(int&&): 0, process(int&...
回顾一下使用std::forward的原因:由于声明为f(T&& t)的模板函数的形参t会失去右值引用性质,所以在将t传给更深层函数前,可能会需要回复t的正确引用行,当然,修改t的引用性办不到,但根据t返回另一个引用还是可以的。恰好,上面的函数printValType是一个会根据实参类型不同,作出不同反映的函数,所以可以把它作为f的...
// FUNCTION TEMPLATE movetemplate <class _Ty>_NODISCARD constexpr remove_reference_t<_Ty>&& move(_Ty&& _Arg) noexcept { // forward _Arg as movable return static_cast<remove_reference_t<_Ty>&&>(_Arg); } std::move的功能是: 传递的是左值,推导为左值引用,仍旧static_cast转换为右值引用。 ...
试题来源: 解析 A。move forward 的反义词是 move backward,向前走和向后走是相反的方向。B 选项 sideways 是向旁边,与 forward 不是反义关系;C 选项 upward 是向上,与 forward 不同方向但不是反义;D 选项 downward 是向下,也不是反义。反馈 收藏 ...
counting room countingforward countries andareas countries in the un countries so country and more country and western country collection country garden and me country garden holida country in trouble country inn suites by country inn suites by country inn suites by country inn suites by country inn...
come forward come here i need affe come join together come a long way have come a thousand miles come aboardfigbecome come across my former come along come and hear come and meet my frie come away with me and come back again come back and kiss me come best come fai tu quando re come...
HttpSendRequest return error : ERROR_INTERNET_SEC_CERT_REV_FAILED in case system time is forward by 1 month I am getting "error C2039: '_file': is not a member of '_iobuf'" when i tried to migrate from VS2010 to VS2015 how to resolve it? I can not turn on Cyrillic alphabet in ...
Moves the current record pointer within the recordset, either forward or backward. 複製 virtual void Move( long nRows, WORD wFetchType = SQL_FETCH_RELATIVE ); Parameters nRows The number of rows to move forward or backward. Positive values move forward, toward the end of the recordset. Negativ...
解析 答案B [考查语境中短语动词的辨析。消防队员和警方一到,拉里和那个人自然退让(back off)到一边,让他们进行专业救援。step forward 向前走;move on 继续前进;set out 开始。均不符合语境。] 结果一 题目 A.stepped forward B.backed offC.moved on D.set out 答案 [解析]选B。背景常识题。消防人员和...