1) C++98 的enum是“非域化的”;而 C++11 的enum class是“域化的”,限制了枚举成员只在域内可见 2)enum class的缺省潜在类型 (underlying type) 是 int 型,而enum没有缺省潜在类型 3)enum class一般总是前置声明,而enum只有在指定了潜在类型时才可以是前置声明 参考资料 《Effective Modern C++》Item 10 ...
enum class FileAccess { Read, Write, Execute }; using FileAccessFlags = std::underlying_type_t<FileAccess>; FileAccessFlags combinedFlags = FileAccess::Read | FileAccess::Write; 通过别名定义底层类型,便于进行位操作或与旧代码兼容。 4. 枚举类的迭代 虽然标准库没有直接提供迭代枚举类的方法,但可...
2.4 指定底层数据类型(underlying type) 默认的底层数据类型是int,用户可以通过:type(冒号+类型)来指定任何整形(除了wchar_t)作为底层数据类型。 1 2 enum class color:unsigned char{red,blue}; enum calss colorb:long long{yellow,black}; 2.5 域 引入了域,要通过域运算符访问,不可以直接通过枚举体成员名来...
The following example calls the GetUnderlyingType method to display the underlying type of some enumeration members. C# კოპირება გაშვება using System; public class Example { public static void Main() { Enum[] enumValues = { ConsoleColor.Red, DayOfWeek...
Add to plan Share via Facebookx.comLinkedInEmail Print Reference Feedback Definition Namespace: System Assembly: System.Runtime.dll Source: Enum.cs Provides the base class for enumerations. C#Copy publicabstractclassEnum:ValueType,IComparable,IConvertible,ISpanFormattable ...
By default, the underlying type of an enumeration is int. However, you can specify the type to be signed or unsigned forms of int, short, long, __int32, or __int64. You can also use char.ExampleCodeCopy // mcppv2_enum_3.cpp // compile with: /clr public enum class day_char ...
The underlying type of theidentifiers. This can be any scalar type, such as signed or unsigned versions of int, short, or long.boolorcharis also allowed. var(optional) The name of a variable of the enumeration type. Remarks enum classandenum structare equivalent declarations. ...
By default, the underlying type of an enumeration is int. However, you can specify the type to be signed or unsigned forms of int, short, long, __int32, or __int64. You can also use char.ExampleCode复制 // mcppv2_enum_3.cpp // compile with: /clr public enum class day_char ...
Add to Plan Share via Facebookx.comLinkedInEmail Print Reference Feedback Definition Namespace: System Assembly: System.Runtime.dll Source: Enum.cs Provides the base class for enumerations. C#Copy publicabstractclassEnum:ValueType,IComparable,IConvertible,ISpanFormattable ...
Add to plan Share via Facebookx.comLinkedInEmail Print Reference Feedback Definition Namespace: System Assembly: System.Runtime.dll Source: Enum.cs Provides the base class for enumerations. C#Copy publicabstractclassEnum:ValueType,IComparable,IConvertible,ISpanFormattable ...