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&...
因为在forward的调用方中,形参已经丢失了右值引用信息,唯一的参考依据是T,要根据T还原为正确的参数,得T&&,因此,强制转换和返回类型都是T&&了,当然,forward还必须被以forward<T>()的方式显示指定模板类型,这样才能保证forward的模板参数T和上层函数f的T是相同类型。首先: 1template<typename T> 2T&& forward(......
std::unique_ptr make_unique(TParam&&... params){ return unique_ptr(new T(forward(params)...)); } 通过递归函数可展开参数包,需要提供一个参数包展开的函数和一个递归终止函数: template T fSum(T first, TRs... rest) { return first + fSum(rest...); } template T fSum(T first) { // ...
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error C2599: 'CustomEnum': the forward declaration of a WinRT enum is not allowed Output Copy error C3197: 'public': can only be used in definitions Example (before) C++ Copy namespace A { public enum class CustomEnum : int32; // forward declaration; error C2599, error C3197 ...
forward_list 单向链表 插入、删除 O(1) 无序 可重复 不支持随机访问 list 双向链表 插入、删除 O(1) 无序 可重复 不支持随机访问 stack deque / list 顶部插入、顶部删除 O(1) 无序 可重复 deque 或 list 封闭头端开口,不用 vector 的原因应该是容量大小有限制,扩容耗时 queue deque / list 尾部插入...
error C2599: 'CustomEnum': the forward declaration of a WinRT enum is not allowed Output Copy error C3197: 'public': can only be used in definitions Example (before) C++ Copy namespace A { public enum class CustomEnum : int32; // forward declaration; error C2599, error C3197 ...
error C2599: 'CustomEnum': the forward declaration of a WinRT enum is not allowed Output Copy error C3197: 'public': can only be used in definitions Example (before) C++ Copy namespace A { public enum class CustomEnum : int32; // forward declaration; error C2599, error C3197 ...