Global inline functions, consts and typedefs have internal linkage.

That means that the declarations in these two files do not interfere with each other:

 	//File1.c	typedef int T;	const int a = 12;	inline T f (int i)	{ return i+a; }	//File2.c	typedef void T;	const int a = 8;				inline T f (double d)	{ cout  <<  d; }

A const can be given external linkage by an explicit declaration:

 	//File3.c					extern const int a;			const int a = 77;	//File4.c	extern const int a;	void g () { cout << a; }	Here, g () will print 77.