ENUM和定义报表之间的差异 [英] Difference between Enum and Define Statements

问题描述

（与C或C ++使用的时候，并没有任何区别）有什么用define语句，并在C / C ++枚举声明之间的区别

例如，当一个应用

 枚举{BUFFER = 1234};
 

在

 的#define BUFFER 1234
 

解决方案

枚举定义语法元素。

的#define 是pre-preprocessor指令，执行的前的编译器看到code和因此不是C本身的语言元素。

一般枚举是preferred，因为他们是类型安全，更容易被发现。定义更难找到并可以有复杂的行为，比如一件code可以重新定义一个的#define 由另一个制作。这可能是很难追查。

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++)?

For example, when should one use

enum {BUFFER = 1234}; 

over

#define BUFFER 1234   

解决方案

enum defines a syntactical element.

#define is a pre-preprocessor directive, executed before the compiler sees the code, and therefore is not a language element of C itself.

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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