class Type { auto myField { 0 }; // error auto param { 10.5f }; // error }; 不幸的是,auto不支持。例如在海湾合作委员会,我得到 error: non-static data member declared with placeholder 'auto' 虽然静态成员只是静态变量,这就是为什么编译器推断类型相对容易,但对于常规成员而言却不那么容易。主要...
#include<stdio.h>classPoint{public:voidinit(){}staticvoidoutput(){printf("%d\n",m_x);}private:int m_x;};voidmain(){Point pt;pt.output();} 编译出错:error C2597: illegal reference to data member ‘Point::m_x’ in a static member function 因为静态成员函数属于整个类,在类实例化对象之...
每一个非静态数据成员的偏移量(offset)在编译时期即可获知,甚至如果member属于一个base class subobject也是一样,因此,存取一个非静态数据成员,其效率和存取一个C struct member或一个nonderived class的member也是一样的。 现在我们看看虚拟继承。虚拟继承将为“经由base class subobject“存取class members导入一层新...
CDaoWorkspace Class CDatabase Class CDatabase Class CDatabase Members CDatabase Member Functions CDatabase Data Members CDataExchange Class CDataPathProperty Class CDataRecoveryHandler Class CDateTimeCtrl Class CDBException Class CDBVariant Class CDC Class CDHtmlDialog Class CDialog Class CDialogBar Class ...
class base; // as above class middle : private virtual base {}; class top : public virtual middle, private virtual bottom {}; void destroy(top *p) { delete p; } Overloaded operator new and operator delete Previous versions of the compiler allowed non-member operator new and non-member ...
E.1.8.1 (6.5.1) The extent to which objects can actually be placed in registers by use of the register storage-class specifier(可通过使用 register 存储类说明符实际放入寄存器中的对象的范围): E.1.9 结构、联合、枚举和位字段 (G.3.9)
CRecordset(CDatabase* pDatabase = NULL); 参数pDatabase 包含指向 CDatabase 对象或 NULL 值的指针。 如果不是 NULL,并且没有调用 CDatabase 对象的 Open 成员函数来将其连接到数据源,则记录集将尝试在自己的 Open 调用期间打开它。 如果传递 NULL,将使用通过 ClassWizard 派生记录集类时指定的数据源信息...
CDaoException class CDaoFieldExchange class CDaoQueryDef class CDaoRecordset class CDaoRecordView class CDaoTableDef class CDaoWorkspace class CDatabase class CDataExchange class CDataPathProperty class CDataRecoveryHandler class CDateTimeCtrl class CDBException class CDBVariant class CDC class CDCRenderTarget...
class Foo { // 禁止该行的所有诊断程序。 Foo(int param); // NOLINT // 考虑解释一下消除警告的动机。 Foo(char param); // NOLINT: 允许从 "char "进行隐式转换,因为<某种有效理由>。 // 只对指定的检查行进行消除 Foo(double param); // NOLINT(google-explicit-constructor, google-runtime-int...
Constructs a CDatabase object. Copy CDatabase(); Remarks After constructing the object, you must call its OpenEx or Open member function to establish a connection to a specified data source. You may find it convenient to embed the CDatabase object in your document class. Example This exa...