How to correctly use the extern keyword in C - Stack Overflow
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 program all of the functions …
How do I use extern to share variables between source files?
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 need to be …
c - What's the difference between using extern and #including header ...
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 normally see extern …
When to use extern in C++ - Stack Overflow
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...
c - What does the extern keyword mean? - Stack Overflow
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, extern …
What is the effect of extern "C" in C++? - Stack Overflow
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 header file that …
Effects of the extern keyword on C functions - Stack Overflow
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.
In simple words, when should I use extern "C"? [duplicate]
44 You need to use extern "C" in C++ when declaring a function that was implemented/compiled in C. The use of extern "C" tells the compiler/linker to use the C naming and calling conventions, instead …
variables - extern and global in c - Stack Overflow
The keyword extern means "the storage for this variable is allocated elsewhere". It tells the compiler "I'm referencing myGlobalvar here, and you haven't seen it before, but that's OK; the linker will know what …
When should I use extern "C" in C++? - Stack Overflow
extern "C" { #include "c_only_header.h" } Otherwise, you might get linker errors, because the library contains the functions with C-linkage (_myfunc), but the C++ compiler, which processed the library's …