C++之头文件

时间：2014-11-02 11:58:33 阅读：131 评论：0 收藏：0 [点我收藏+]

bash:

g++ a.cpp b.cpp --save-temps -Wall

Definition of a class

The header files

If a function is declared in a header file,you must include the header file everywhere the function is used and where the function is defined.
If a class is declared in a header file,you must include the header file everywhere the class is used and where class member functions are defined.

Header = interface

The header is a contract between you and the user of your code.
The compile enforces the contract by requirig you to declare all structures and functions before they are used.

Declarations vs. Definitions

#include

#include is to insert the included file into the .cpp file at where the #include statement is.

#include "xx.h":first search in the current directory,then the directories declared somewhere
#include <xx.h>:search in the specified directories
#include <xx>:same as #include <xx.h>

Standard header file struct

#ifndef HEADER_FLAG

#define HEADER_FLAG

//Type declaration here...

#endif // HEADER_FLAG

Tips for header

原文地址：http://www.cnblogs.com/sunchangjun/p/4068763.html

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C++之 头文件