枚举类型(enum) 枚举类型是由基础整型数值类型的一组命名常量定义的值类型。一般使用enum关键词定义枚举类型并指定枚举成员。 enumSeason { Spring, Summer, Autumn, Winter } 默认情况下,枚举成员的关联常数值为类型int,它们从0开始,并按定义文本顺序递增1,可以显式指定任何其他整数数值类型作为枚举类型的基础类型,还...
Allocate to an enum type only as many bytes as it needs for the declared range of possible values. Specifically, the enum type is equivalent to the smallest integer type that has enough room. Warning: the -fshort-enums switch causes GCC to generate code that is not binary compatible with ...
values()方法是编译器插入到enum定义中的static方法,所以,当你将enum实例向上转型为父类Enum是,values()就不可访问了。解决办法:在Class中有一个getEnumConstants()方法,所以即便Enum接口中没有values()方法,我们仍然可以通过Class对象取得所有的enum实例 无法从enum继承子类,如果需要扩展enum中的元素,在一个接口的内...
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To explicitly assign an integer value to a variable of an enumerated data type, use a type cast: C workday = (enumDAY ) ( day_value -1); This cast is recommended in C but isn't required. C enumBOOLEAN/* Declares an enumeration data type called BOOLEAN */{false,/* false = 0, ...
Allocate to an enum type only as many bytes as it needs for the declared range of possible values. Specifically, the enum type is equivalent to the smallest integer type that has enough room. Warning:the -fshort-enums switch causes GCC to generate code that is not binary compatible with co...
You'll also need to update the calls to placement new to pass the new type (for example, by using static_cast<my_type> to convert from the integer value) and update the definition of new and delete to cast back to the integer type. You don't need to use an enum for this; a ...
Primitives (int, string, etc...), Enums, Nullable<>, Lazy<> TimeSpan, DateTime, DateTimeOffset Guid, Uri, Version, StringBuilder BigInteger, Complex, Half Array[], Array[,], Array[,,], Array[,,,], ArraySegment<>, BitArray KeyValuePair<,>, Tuple<,...>, ValueTuple<,...> ...
EnumMap 中的方法 从此映射中移除所有映射关系。 clear() - 类 java.util.HashMap 中的方法 从此映射中移除所有映射关系。 clear() - 类 java.util.HashSet 中的方法 从此set 中移除所有元素。 clear() - 类 java.util.Hashtable 中的方法 将此哈希表清空,使其不包含任何键。 clear() - ...
Enumeration values for the various iOS and macOS platforms supported by Xamarin. This enumeration supports a bitwise combination of its member values. C#Ikkopja [System.Flags] [System.Obsolete("Use [Introduced|Deprecated|Obsoleted|Unavailable] attributes with PlatformName.")]publicenumPlatform ...