枚举和定义语句之间的区别
在 C/C++ 中使用 define 语句和 enum 语句有什么区别(在 C 或 C++ 中使用它们时有什么区别)?
What's the difference between using a define statement and an enum statement in C/C++ (and is there any difference when using them with either C or C++)?
例如，什么时候应该使用
For example, when should one use
enum {BUFFER = 1234};
结束
#define BUFFER 1234
推荐答案
enum 定义了一个语法元素.
enum defines a syntactical element.
#define 是一个预处理器指令，在编译器看到代码之前执行，因此不是 C 本身的语言元素.
#define is a pre-preprocessor directive, executed before the compiler sees the code, and therefore is not a language element of C itself.
通常首选枚举，因为它们是类型安全的并且更容易被发现.定义更难定位并且可能具有复杂的行为，例如一段代码可以重新定义由另一段代码创建的 #define.这可能很难追踪.
Generally enums are preferred as they are type-safe and more easily discoverable. Defines are harder to locate and can have complex behavior, for example one piece of code can redefine a #define made by another. This can be hard to track down.
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