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
// 导出函数 extern "C" int add(int a, int b);
Export variable
// 导出变量 extern "C" int global_variable;
Export class
// 导出类 extern "C" class MyClass { public: int member_variable; void member_function() {} };
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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