3) 满足基特征 (BaseCharacteristic) 为 std::integral_constant<std::size_t, variant_size<T>> 的一元类型特征 (UnaryTypeTrait) 要求辅助变量模板template <class T> inline constexpr std::size_t variant_size_v = std::variant_size<T>::value; (C++17 起) ...
variant_sizevariant_size_v (C++17) obtains the size of thevariant's list of alternatives at compile time (class template)(variable template) variant_alternativevariant_alternative_t (C++17) obtains the type of the alternative specified by its index, at compile time ...
打造variant的关键技术: 1.找出最大的typesize 第一个问题中需要解决的问题是如何找出多种类型中,size最大的那个类型的size。看看如何从多种类型中找出最大类型的size。 template<typename T, typename... Args>structMaxType : std::integral_constant<int, (sizeof(T)>MaxType<Args...>::value ?sizeof(T...
class T> struct variant_size<volatile T>; template <class T> struct variant_size<const volatile T>; template <class T> inline constexpr size_t variant_size_v = variant_size<T>::value; template <class... Types> struct variant_size<variant<Types...>>; ...
// not definedtemplate<classT>structvariant_size<const T>;template<classT>structvariant_size<volatile T>;template<classT>structvariant_size<const volatile T>;template<classT>inlineconstexprsize_tvariant_size_v=variant_size<T>::value;template<class...Types>structvariant_size<variant<Types...>>...
17、d machine register size width* VT_VOID T C style void* VT_HRESULT T Standard return type* VT_PTR T pointer type* VT_SAFEARRAY T (use VT_ARRAY in VARIANT)* VT_CARRAY T C style array* VT_USERDEFINED T user defined type* VT_LPSTR TP null terminated string* VT_LPWSTR TP wide ...
typedef struct tagCLIPDATA { // cbSize is the size of the buffer pointed to // by pClipData, plus sizeof(ulClipFmt) ULONG cbSize; long ulClipFmt; BYTE* pClipData; } CLIPDATA; 在唯一的 PROPVARIANT类型中,有几种数据类型定义其他数据类型的计数数组。 所有计数数组的数据类型以字母CA(例如CAUB...
BSTR_UserSize64 函数 BSTR_UserUnmarshal 函数 BSTR_UserUnmarshal64 函数 CALLCONV 枚举 CUSTDATA 结构 CUSTDATAITEM 结构 DESCKIND 枚举 DISPPARAMS 结构 EXCEPINFO 结构 FUNCDESC 结构 FUNCFLAGS 枚举 FUNCKIND 枚举 ICreateErrorInfo 接口 ICreateTypeInfo 接口 ICreateTypeInfo2 接口 ICreateTypeLib 接口 ICreateTy...
1. 2. 3. 4. 5. static void construct(QVariant::Private *x, const void *copy) { x->is_shared = false; switch (x->type) { case QVariant::String: v_construct<QString>(x, copy); break; ... default: void *ptr = QMetaType::construct(x->type, copy); if (...
Full size image Genomic screening of post-crisis clones To assess the genome structure of proliferating post-crisis cells, single-cell clones were isolated from induced MRC5/Rbsh/p21sh/iCRISPRa-TERT cells at day 120 (“Y clones”) and day 150 (“Z clones”) (Fig. 4a). The clonal yield...