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In C, functions are global by default. The “static” keyword before a function name makes it static.
You only use static functions if you want to limit the access to a function to the file they are declared. So you actively restrict access by declaring it static... The only requirement for implementations in the header file, is for c++ template functions and template class member functions.
A static method (or static function) is a method defined as a member of an object but is accessible directly from an API object's constructor, rather than from an object instance created via the constructor.
In the static memory allocation, variables get allocated permanently, till the program executes or function call finishes. In the Dynamic memory allocation, variables get allocated only if your program unit gets active. 2. Static Memory Allocation is done before program execution.
Functions and variables declared static have internal linkage and they have file scope and they are not visible to functions in other files.
Suppose that i declare a function like this:-
static int foo(int i);
in one file named file1.c Can I access this function from other file file2.c through the use pointers.
I am going through a book in which it is written that it can done but I don't know how that is possible.
And these are the exact lines:-
Because it has internal linkage , foo can't be called directly from outside the file in which it's defined.(Declaring foo to be static doesn't completely prevent it from being called in another file; an indirect call via a function pointer is still possible).
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