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...
enum class my_type : size_t {}; 然后,更改对 placement new 和 delete 的定义,以使用此类型作为第二个自变量(而不是 size_t)。 你还需要更新对 placement new 的调用以传递新类型(例如,通过使用 static_cast<my_type> 从整数值转换)并更新 new 和delete 的定义以强制转换回整数类型。 你无需为此使用...
Exporting static class members Exporting static member functions expression must have integral or unscoped enum type? expression must have pointer-to-object or handle-to-C++/CLI-array type Problem Expression:(L"Buffer is too small" &&0) error from strcpy_s() function Extract String from EXE Ext...
Compiler warning (level 1 and level 4, off) C4626'derived class': assignment operator was implicitly defined as deleted Compiler warning (level 1, no longer emitted) C4627'identifier': skipped when looking for precompiled header use Compiler warning (level 1, off) C4628digraphs not supported ...
public enum UniversityCourses { Maths, Chemistry, Anatomy, LifeSkills } public enum UniversityDegree { BA, BSc } Listing 1-18 Class enums 我不打算详细讨论这个例子中使用的每个类。您可以下载本书的源代码,并根据需要使用示例。 现在,假设我们有以下对象: 人员类别 学生类(继承自 Person 类) 讲师...
public enum class E { e }; void f(System::String ^s) { s += E::e; // in VS2019 C2845: 'System::String ^': pointer arithmetic not allowed on this type. } To avoid the error in this example, use the += operator with the ToString() method: s += E::e.ToString();.Initia...
Matching structures, unions, and enums must have the same number of members. Each matching member must have a compatible type (in the separate compilation sense), including bit-field widths. Matching structures must have the members in the same order. The order of union and enum members does...
enum class my_type : size_t {}; Then, change your definition of placement new and delete to use this type as the second argument instead of size_t. 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...
". To achieve the old effect in ISO C, we make use of the#macro substitution operator and the concatenation of string literals. #define str(a) #a "!" str(x y) The above code produces the two string literals"x y"and"!"which, after concatenation, produces the identical"x y!"....
#operator not followed by maco argument name(#运算符后没跟宏变元名) 分析与处理:在宏定义中,#用于标识一宏变串。“#”号后必须跟一个宏变元名。 'xxxxxx' not anargument ('xxxxxx'不是函数参数) 分析与处理:在源程序中将该标识符定义为一个函数参数,但此标识符没有在函数中出现。