>){ return std::array<std::string_view, num>{ enum_name<static_cast<T>(Is)>()... }; }(std::make_index_sequence<num>{}); return names[static_cast<std::size_t>(value)]; } 测试一下 enum Color { RED, GREEN, BLUE }; int main(){ Color color = RED; std::cout << enum_...
How to Cast an Int to an Enum in C#Jun 17, 2024 • Chris Pietschmann • C# Casting an integer to an enum in C# is a common task, especially when dealing with data that might come from a database, user input, or another external source. This article goes through the process, ...
varintValue=100;varenumValues=Enum.GetValues(typeof(LogLevel)).Cast<int>().ToList();if(enumValues.Contains(intValue)){Console.WriteLine("We can Cast C# int to Enum");LogLevelloggingValue=(LogLevel)intValue;}else{Console.WriteLine("Cannot Cast C# int to Enum");} ...
> int compareTo(E o):用于与指定枚举对象比较顺序,同一个枚举实例只能与相同类型的枚举实例进行比较。如果该枚举对象在指定枚举对象之后,则返回正整数;如果该枚举对象再指定枚举对象之前,则返回负整数;否则返回0。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 publicenumSeasonEnum{SPRING,SUMMER,FALL,WINTER...
How to cast int to enum? Method 1: Following is the easiest method to cast an int to enum. MyEnum myenum = (MyEnum)intvalue; example enum Days { Sunday = 1, TuesDay = 2, wednesday=3 } //cast to enum Days day = (Days)3; ...
mysql转换()和CAST()为integer将值增加1 、 我试图从电话呼叫表中选择记录,其中名为Call_Rating的ENUM字符串字段的值小于整数值4。Call_Rating字段只能包含'0‘、'1’、'2‘、'3’、'4‘、'5’的值。除了手动从CALL()或CAST()函数中减去1之外,还有其他方法可以避免吗?DEFAULT '0',) ENGINE=MyISAM AUTO...
(2) compareTo()方法: Enum实现了java.lang.Comparable接口,因此可以比较象与指定对象的顺序。Enum中的compareTo返回的是两个枚举值的顺序之差。当然,前提是两个枚举值必须属于同一个枚举类,否则会抛出ClassCastException()异常。(具体可见源代码) Color.RED.compareTo(Color.BLUE); //返回结果 -1 ...
enum calss Enum:unsigned int{VAL1,VAL2};• 1 正如前面所说,强类型枚举能解决传统枚举不同枚举类下同枚举值名的问题,使用枚举类型的枚举名时,必须指明所属范围,比如:Enum::VAL1,而单独的VAL1则不再具有意义。 还有一点值得说明的是C++11中枚举类型的前置声明也是可行的,比如: ...
改变类型(只能改变成:byte, sbyte, short, ushort, int, uint, long, ulong): enumDirection:long { UP = 1111111111, DOWN = 1111111112, LEFT = 1111111113, RIGHT = 1111111114 }; 访问Enumeration变量的值 赋值前先cast(强制类型转换): longdirect = (long)Direction.UP; ...
默认的底层数据类型是int。 举个例子: #include <iostream> using namespace std; enum class color{ red, yellow, blue }; void fun_int(int x) { cout<<"fun int: "<<x<<endl; } int main() { color c(static_cast<color>(1)); //error //fun_int(c); fun_int(static_cast<int>(c))...