How to export c++ program

In C, symbols, including functions, variables and classes, are exported through the extern "C" keyword. Exported symbols are extracted and used according to C language rules between compilation units or when interacting with other languages.

C How to export a program

What is export?

Export is a process of extracting functions, variables or objects in a program from a compilation unit to other compilation units or libraries for use.

How to export in C

In C, symbols can be exported by using the extern keyword.

Export function

<code class="cpp">// 导出函数
extern "C" int add(int a, int b);</code>

Export variable

<code class="cpp">// 导出变量
extern "C" int global_variable;</code>

Export class

<code class="cpp">// 导出类
extern "C" class MyClass {
public:
    int member_variable;
    void member_function() {}
};</code>

Reason for using extern "C"

extern "C" keyword tells the compiler to export symbols according to the rules of C language. This is important for interacting with code written in other languages.

Other export options

In addition to using extern "C", there are other options for exporting symbols:

• Definition file (.h): Contains the declaration of exported symbols and can be included in multiple compilation units.
• Dynamic Link Library (DLL): Store exported symbols in a separate library that can be loaded on demand.

Export Notes

• The exported symbol name cannot conflict with existing symbols.
• Exported symbol types and parameters must be compatible with the code that imports them.
• Be careful when exporting symbols as this may break the encapsulation of your code.

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