原文链接:http://www.geeksforgeeks.org/extern-c-in-c/ C++ supports function overloading, i.e., there can be more than one functions with same name and differences in parameters. How does C++ compiler distinguishes
这是由于,C语言中是没有name mangling的,但是C++有。 C编译器在编译的时候不会对identifier做name mangling,但是对于C++编译器,假如引用C代码但是却不加extern"C",它就会把那个函数名改得面目全非(name mangling)。 结果,用C++编译器编译的C程序的函数名、变量名等 与C库里的同名函数,变量对应不上(因为C++编译...
编译错误的原因是C++编译器对printf函数进行了name mangling,然后找不到重命名后的函数的符号。解决办法就是使用extern "C" 关键字。 //Save file as .cpp and use C++ compiler to compile itextern"C"{intprintf(constchar*format,...); }intmain() { printf("GeeksforGeeks");return0; } 1. 2. 3....
CC++Server Side ProgrammingProgramming In C++ we can use the function overloading feature. Using this feature, we can create functions with same name. The only difference is the type of the arguments, and the number of arguments. The return type is not considered here. Now the question ...
This tutorial educates about the use of extern C in C++. It also explains the name mangling in C++.
extern "C" { void foo(); } extern "C" makes a function-name in C++ have 'C' linkage (compiler does not mangle the name) so that client C code can link to (ie use) your function using a 'C' compatible header file that contains just the declaration of your function. Your function...
in C? C has a keyword extern. For example:#include <stdio.h> int main() { extern int x; printf("x = %d\n", x); }Note the extern on the x. What does this do? Let’s compile it to find out:$ clang main.c Undefined symbols for architecture x86_64: "_x", referenced from...
error C2059:syntax error:'string' CAUSE In the C language, the string-literal "C" is not recognized. It is used in C++ to prevent name decoration. RESOLUTION Remove the string-literal "C" in extern declarations, or use the following in the function declaration: ...
则限制了变量的作用域，仅对当前文件中的函数可见。下表总结了extern和static对变量作用域的影响：使用extern和static关键字时，理解它们对变量生命周期和作用域的控制至关重要。这有助于编写出更加模块化、可维护且易于理解的代码。参考文献：1. Understanding “extern” keyword in C 2. 静态变量 ...
extern关键字还有一个重要的用途是用于链接C和C++代码。当我们在C++代码中使用extern "C"时,我们告诉编译器按照C语言的规则来链接代码。 例如,如果我们有一个C语言的库文件(比如clib.c),我们可以在C++代码中通过extern "C"来引用这个库。 // clib.c void c_func() { // function definition in C } // ...