Jan 31, 2009 · My question is about when a function should be referenced with the extern keyword in C. I am failing to see when this should be used in practice. As I am writing a …

Using extern is only of relevance when the program you're building consists of multiple source files linked together, where some of the variables defined, for example, in source file file1.c …

I'm reading "Think in C++" and it just introduced the extern declaration. For example: extern int x; extern float y; I think I understand the meaning (declaration without definition), but I wonde...

The extern keyword takes on different forms depending on the environment. If a declaration is available, the extern keyword takes the linkage as that specified earlier in the translation unit.

Aug 23, 2011 · The other is using header files: Declare functions/variables using extern in a header file (*.h/*.hh). Still, extern is optional for functions, but not for variables. So you don't …

Jun 25, 2009 · 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 (use) your function using a C compatible …

Mar 4, 2009 · The use case for extern "C++" is when calling C++ library function in a C function. The sub-use case, that is relevant, is when linking a C++ library with a C source code with …

Sep 10, 2010 · Extern The extern keyword denotes, that “this identifier is declared here, but is defined elsewhere”. In other words, you tell the compiler that some variable will be available, …

41 The extern keyword declares a variable or function and specifies that it has external linkage (its name is visible from files other than the one in which it's defined). When modifying a variable, …

How does someone leverage the extern attribute? Write your code in the unmanaged language of your choice. Compile it into a DLL, exporting the entry point of your code. Make an interop …