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see in one project source code i have seen belows declaration
static int *foo();
so it declare foo as static function returning pointer to int. So here i wana ask you whats the purpose of declaring function as static ?
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A static method belongs to the class rather than the object of a class. A static method can be invoked without the need for creating an instance of a class. A static method can access static data member and can change the value of it.
Static function: Advantage: it could be called without existing real object. Static member functions become useful when you want the class as a whole to have a function, instead of each individual object. With a static member function, you can then change static variable data.
Unlike global functions in C, access to static functions is restricted to the file where they are declared. Therefore, when we want to restrict access to functions, we make them static. Another reason for making functions static can be reuse of the same function name in other files.
It prevents other translation units (.c files) from seeing the function. Keeps things clean and tidy. A function without static is extern by default (is visible to other modules).
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Declaring a function as static prevents other files from accessing it. In other words, it is only visible to the file it was declared in; a "local" function.
You could also relate static (function declaration keyword, not variable) in C as private in object-oriented languages.
See here for an example.
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