在头文件中实现类的优点和缺点是什么？ [英] What are the advantages and disadvantages of implementing classes in header files?

问题描述

我喜欢DRY的概念（不要重复自己[oops]），但是C ++的头文件概念违背了这种编程规则。在头中定义类成员是否有任何缺点？如果它是正确的做模板，为什么不为正常类？

I love the concept of DRY (don't repeat yourself [oops]), yet C++'s concept of header files goes against this rule of programming. Is there any drawback to defining a class member entirely in the header? If it's right to do for templates, why not for normal classes? I have some ideas for drawbacks and benefits, but what are yours?

推荐答案

将所有内容放在头文件中可能具有的优点：

Possible advantages of putting everything in header files:

• 减少冗余（导致更容易的更改，更容易重构等）

可能的缺点包括：将所有内容放在头文件中：

Possible disadvantages of putting everything in header files:

• 更长的编译/链接周期




• 可能导致难以解决的循环依赖


• 许多内联会增加可执行文件大小


• 阻止共享库/ DLL的二进制兼容性


• 颠覆喜欢使用C ++的传统方式的同事

• Longer compile/link cycles
• Loss of separation of interface and implementation
• Could lead to hard-to-resolve circular dependencies
• Lots of inlining could increase executable size
• Prevents binary compatibility of shared libraries/DLLs
• Upsets co-workers who prefer the traditional ways of using C++

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