\n";//std::cout << color; // won't work, because there's no implicit conversion to intcolor = Color::BLUE; std::cout <<static_cast<int>(color) << std::endl;// will print 1return0; } }// namespace enum_class_ GitHub:https://github.com/fengbingchun/Messy_Test...
Hint: For input, you can convert an int into an enum with static_cast. 1 2 3 4 DayOfWeek day;intdayNumber; cin >> dayNumber; day =static_cast<DayOfWeek>(dayNumber); and the output I am supposed to get should look like this: ...
>){ 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...
用enum class,则会涉及类型转换,看上去比较繁琐 enumclassUserInfoFields{uiName,uiEmail,uiReputation};UserInfouInfo;// as before…autoval=std::get<static_cast<std::size_t>(UserInfoFields::uiEmail)>(uInfo); 此时,可用模板函数,将枚举成员 UserInfoFields::uiEmail 和 std::size_t 类型联系起来 templa...
static_cast<unsigned&>(status); ^ ~~~ What I'm trying to do is avoid defining a variable to temporarily hold the value from the input stream and then static_cast it later. Can someone help me understand what I'm missing here? I feel like I'm missing a fundamental piece of how...
做你自己的强制转换函数可以帮助你，你可以使用c++20的概念和约束来 Packageconst_cast函数，它指定了模板...
{age ="<<Person.m_iAge<<",name ="<<Person.m_sName<<"}"<<std::endl;12std::cout<<"eating"<<std::endl;13std::cout<<"end"<<std::endl;14}1516voideat(People &Person)17{18static_cast<constPeople&>(*this).eat(Person);19}20private:21std::stringm_sName;22intm_iAge;23};2425...
回答C++ 有两种枚举(enum), enum class enum 它们的使用也很简单,例如, enum class Color { red, green, blue }; // enum class...number = myAnimal; // 错误,不允许隐式转换 number = static_ca...
目前型別會為每個列舉值指定配置的儲存區。 然而,將 enum 型別轉換成整數類資料型別需要明確轉換。 例如,下列陳述式會藉由使用轉型 (Cast) 將 enum 轉換成 int,而將列舉程式 Sun 指派給int型別的變數。 int x = (int)Days.Sun; 當您將FlagsAttribute套用至含有可與位元 OR 運算結合之項目的列舉時,這個屬性...
> public static <T extends Enum<T>> T valueOf(Class<T> enumType,String name):静态方法,用于返回指定枚举类中指定名称的枚举值。名称必须与在该枚举类中声明枚举值时所使用的标识符完全匹配,不允许使用额外的空白字符。 代码语言:javascript 复制