Named Global Arrays

[Tofu Ninja via Digitalmars-d]

This might already exist but I thought that it was cool that it
was possible in D non the less. Just thought I would share :)

struct namedGlobalArray(string name, T)
{
	import std.typecons;
	T opDispatch(string var)(T x)
	{
		Nullable!T tmp = x;
		return accessStorage!var(tmp);
	}
	
	T opDispatch(string var)()
	{
		Nullable!T tmp;
		return accessStorage!var(tmp);
	}
	
	public T accessStorage(string var)(Nullable!T x)
	{
		static T data;
		if(!x.isNull) data = x;
		return data;
	}
}

Example usage...

Module A:
void main(string[] args)
{
	import moduleB;
	namedGlobalArray!("GlobArray",int) glob;
	namedGlobalArray!("GlobArray2",int) glob2;
	glob.a = 10;
	glob.b = 20;
	glob2.a = 77;
	assert(glob.a == 10);
	assert(glob.b == 20);
	assert(glob.c == 0);
	assert(glob2.a == 77);
	testGlob();
	assert(glob.a == 314);
	assert(glob.b == 20);
	assert(glob.c == 9);
	assert(glob2.a == 77);
}

Module B:
public void testGlob()
{
	namedGlobalArray!("GlobArray",int) glob;
	glob.a = 314;
	glob.c = 9;
}

There might be a way to do it without Nullable but I couldn't
think of one...