C++ 概念中的名称修饰与 Extern "C"

2024 年 8 月 28 日 | 3 分钟阅读

我们知道，C++ 编程语言功能强大，是业界广泛用于游戏机开发的编程语言。它支持重载功能，这意味着我们可以定义多个同名但参数不同的函数，编译器能够将它们映射为独立的实体。

相比之下，当函数名称相同但参数不同时，我们使用名称修饰（name mangling）方法来映射这些同名函数，让编译器将它们理解为不同的对象。该方法会向任务中添加额外的信息，使其有所区别。因此，本地或在线编译器在运行它们时不会产生混淆。

C++ 代码

// here we are writing down the tiny code snippet to demonstrate the 
// concept of Name Mangling and extern "C" in C++, function overloading in C++
// programming language and name mangling concept
int v(void) { return 1; }
// this is a sample integer variable declared with a return type 0.
int v(int) { return 0; }
// A simple void function holding integer variables i and j.
void hh(void) { int i = v(), j = v(0); }


// end of the Name Mangling and extern "C" in C++ concept partial 
// demonstration

输出

G ++ / t m p/F mT y bF gU rL. cpp
/usr/bin/ld: cannot open output file a.out: Permission denied
collect2: error: ld returned one exit status

C++ 代码

// here we are writing down the tiny code snippet to demonstrate the 
// concept of Name Mangling and extern "C" in C++, function overloading in C++
// programming language and name mangling concept


// this is a sample integer variable declared with a return type 1.
int __f_v(void) { return 1; }
 
 
// this is a sample integer variable declared with a return type 1.
int __f_i(int) { return 0; }


// A simple void function holding integer variables i and j. 
void __g_v(void) { int i = __f_v(), j = __f_i(0); }

// end of the Name Mangling and extern "C" in C++ concept partial 
// demonstration

输出

G ++ / t m p/F mT y bF gU rL. cpp
/usr/bin/ld: cannot open output file a.out: Permission denied
collect2: error: ld returned 1 exit status

C++ 代码

// here we are writing down the tiny code snippet to demonstrate the 
// concept of Name Mangling and extern "C" in C++, function overloading in C++
// programming language and name mangling concept

int printf(const char* format, ...);

// the main driver code functionality starts from here 
int main()
{
    // A simple printf function holding the display statement javaTpoint.com
	printf("javaTpoint.com");
	return 0;
}

// end of the Name Mangling and extern "C" in C++ concept partial 
// demonstration

输出

g++ /tmp/FmTybFgUrL.cpp
/usr/bin/ld: cannot open output file a.out: Permission denied
collect2: error: ld returned 1 exit status

C++ 编程语言中的 Extern "C"

C++ 代码

// here we are writing down the tiny code snippet to demonstrate the 
// concept of Name Mangling and extern "C" in C++, function overloading in C++
// programming language and name mangling concept

extern "C" {
int printf(const char* format, ...);
}

// the main driver code functionality starts from here 
int main()
{
    // A simple printf function holding the display statement javaTpoint.com
	printf("javaTpoint.com");
	return 0;
}

// end of the Name Mangling and extern "C" in C++ concept partial 
// demonstration

输出

G ++ / t m p/F mT y bF gU rL. cpp
javaTpoint.com

stdio.h, string.h 文件中的 C 风格声明

C++ 代码

// here we are writing down the tiny code snippet to demonstrate the 
// concept of Name Mangling and extern "C" in C++, function overloading in C++
// programming language and name mangling concept
#ifdef __cplusplus
extern "C" {
#endif
// Declarations of this file
// this below small code helps us with declarations of the file
#ifdef __cplusplus
}
#endif
// end of the Name Mangling and extern "C" in C++ concept partial 
// demonstration

输出

G ++ / t m p/F mT y bF gU rL. cpp
/usr/bin/ld: cannot open output file a.out: Permission denied
collect2: error: ld returned 1 exit status

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