Hi all:

I want to know something about the forecast().

I have already known that forcast() can tell scheduler how

many input items are required for each output item.

1.But now i have read two example:

The first one:

void your_block::forecast(int

noutput_items,gr_vector_int &ninput_items_required){

ninput_items_required[0]=100 *

noutput_items;

```
ninput_items_required[1]=100 *
```

noutput_items; }

I have already understand it.

But the second one:

void forecast (int noutput_items,

gr_vector_int &ninput_items_required)

{

unsigned ninputs =

ninput_items_required.size ();

for (unsigned i = 0; i < ninputs; i++)

ninput_items_required[i] = 1;}

I can’t understand since we can’t know how many

input items we required,why use ninput_items_required.size ().Can

someone help me?

2.I want to know if we use the general_work().Is it means

that we must use the forcast()?Thanks.

Best regards