public static int FindIndex <T>(this IPersistentArray <T> array, Func <T, bool> predicate)
{
Debug.Assert(array != null);
Debug.Assert(predicate != null);
return(Enumerable.Range(0, array.Length).First(i => predicate(array[i])));
}
public static IPersistentArray <U> Map <T, U>(this IPersistentArray <T> array, Func <T, U> mapper)
{
Debug.Assert(array != null);
Debug.Assert(mapper != null);
return(new PersistentArray <U>(array.Length, i => mapper(array[i])));
}
private PersistentGrid(int width, int height, IPersistentArray <IPersistentArray <T> > items)
{
Debug.Assert(width >= 0);
Debug.Assert(height >= 0);
Debug.Assert(items.Length == width);
Debug.Assert(width == 0 || items.All(col => col.Length == height));
this._items = items;
this.Width = width;
this.Height = height;
}
public PersistentGrid(int width, int height, Func <Vector2D, T> initializer)
{
Debug.Assert(width >= 0);
Debug.Assert(height >= 0);
Debug.Assert(initializer != null);
this.Width = width;
this.Height = height;
this._items = new PersistentArray <IPersistentArray <T> >(width, x =>
{
return(new PersistentArray <T>(height, y => initializer(new Vector2D(x, y))));
});
}
public static IPersistentArray <T> Update <T>(this IPersistentArray <T> array, int index, Func <T, T> updater)
{
return(array.Set(index, updater(array[index])));
}
public static bool IsValidIndex <T>(this IPersistentArray <T> array, int index)
{
return(0 <= index && index < array.Length);
}
