Enumerated Type Declaration When you define an enum type, the blueprint for the variable is created. Here's how you can create variables of enum types. enum boolean {false, true}; enum boolean check; // declaring an enum variable
enum_declaration : attributes? enum_modifier* 'enum' identifier enum_base? enum_body ';'? ; enum_base : ':' integral_type | ':' integral_type_name ; integral_type_name : type_name // Shall resolve to an integral type other than char ; enum_body : '{' enum_member_declarations? '...
use of enum E without previous declaration 因为C++98标准中没有支持枚举类型前向声明,所以就不能保证上面的写法对任何编译器都行。为什么枚举类型不能被前向声明呢? 因为编译器无法知道枚举变量所需的存储空间。 在编译期,C ++编译器要为变量保留存储空间。 如果所有可见的都是前向声明,那么编译器无法知道选择哪...
from Declaration hasSpecifier from UserType inMemberOrFriendOf Holds if this can access private members of class c. from AccessHolder internal_getAnAdditionalSpecifier Internal – should be protected when QL supports such a flag. Subtypes override this to recursively get specifiers that are not attac...
小林C语言 2021/01/06 1.1K0 c++11:枚举类型(enum)的前向声明(forward declaration) https网络安全编程算法ide打包 在C++11之前,C++标准是不支持枚举类型的前向声明的。我说出这个结论,肯定有用msvc的童鞋不愿意了:口胡,MSVC明明就可以对枚举类型前向声明,下面这样的前向声明在MSVC下好好的,没有任何问题。 10km...
// forward declaration enum class Status; // use of fwd-declared enum void continueProcessing(Status s); 2) 潜在类型 enum class 的潜在类型 (underlying type),缺省为 int 型,当然也可自定义潜在类型。无论哪种方式,编译器都会预先知道枚举成员的大小 // underlying type is int enum class Status; ...
Scope of Symbols in an enum Declaration 文章 31/05/2018 In MIDL, the scope of symbols in an enum is global with MIDL, as it is in C. In the following example, MIDL will generate a duplicate name error: C++ typedefstruct{... } a;enum{a=1, b=2, c=3};...
3. the underlying type of an enum cannot be specified, causing confusion,compatibility problems, and makes forward declaration impossible. The new enums are "enum class" because they combine aspects of traditional enumerations (names values) with aspects of classes (scoped members and absense of ...
Apublic enum classorpublic enum structdeclaration can have an underlying type of any integral type although the Windows Runtime itself requires that the type be int32, or uint32 for a flags enum. The following syntax describes the parts of apublic enum classorpublic enum struct. ...
Thedeclaration contextfor an enumeration must be a source file, namespace, class, structure, module, or interface, and cannot be a procedure. For more information, seeDeclaration Contexts and Default Access Levels. You can apply attributes to an enumeration as a whole, but not to its members ...