c++模板里展开变长参数在项目里的应用

put是重载函数，有多个只接收一个参数的。

class DataExternalizer
{

};

///@code{.unparsed} ///此函数的功能： /// /// 写入数据。这些参数的类型要符合Bentley::DataExternalizer::put的各个重载函数 /// ///@endcode ///@return true:成功 false:失败 ///@author Simon.Zou @date 2026/04/09 template<typename ...Args> static bool SetData( DgnPlatform::EditElementHandle& eeh, UInt16 majorId,// = HchxElemSideDrawing_XAMajorId, UInt16 minorId,// = HchxElemSideDrawing_XAMinorId, UInt32 xaId,// = HchxElemSideDrawing_XaId_General Args&&... param ) { Bentley::DataExternalizer sink; int dummy[] = { (sink.put(std::forward<Args>(param)),0)... }; std::ignore = dummy; XAttributeHandlerId xAttributeHandlerId(majorId, minorId); UInt32 xAttrId = xaId; return BentleyStatus::SUCCESS == eeh.ScheduleWriteXAttribute(xAttributeHandlerId, xAttrId, sink.getBytesWritten(), sink.getBuf()); } 引用： bool MiscUtil::SetComponentType( EditElementHandleR eeh, ///<IN const ObjectType& oType, ///<OUT const std::wstring& linkDataStr,// = StringUtil::s2ws(LinkData::CreateFakeJsonstr()) const std::wstring& uuid//= L"123", ) { int version = 1; WString str0 = (const_cast<ObjectType&>(oType)).GetStr().c_str(); WString str1 = uuid.c_str(); WString str2 = linkDataStr.c_str(); XAttributeHandlerId xAttributeHandlerId = HCHXKERNEL::GetLinkDataXAId();//(HchxElem106XAMajorId, HchxElem106XAMinorId); UInt16 majorId = xAttributeHandlerId.GetMajorId(); UInt16 minorId = xAttributeHandlerId.GetMinorId(); UInt32 xaId = 0; //在这里调用 return MiscUtil::SetData( eeh, majorId, minorId, xaId, version, str0, str1, str2 ); }

下面的代码，C++14还不支持： template<typename ...Ts> void printNumber(Ts... nums) { ((std::cout<<nums<<""),...); std::cout << std::endl; } void main1124ff() { printNumber(1, 2, 3, 4, 5); } error C3520: “nums”: 必须在此上下文中扩展参数包 参见对正在编译的函数 模板 实例化“void printNumber<int,int,int,int,int>(int,int,int,int,int)”的引用 error C2059: 语法错误:“...”