### astTestCell

Tests if a single HEALPix cell is included in a Moc

#### Description:

This function returns a non-zero value if the Moc includes the specified cell.

#### Synopsis

void astTestCell( AstMoc $\ast$this, int order, int64_t npix, int parent )

#### Parameters:

##### this
Pointer to the Moc to be modified.
##### order
The HEALPix order of the cell to test. Zero is returned if this is higher than the maximum order allowed in the Moc (as given by its MaxOrder attribute).
##### npix
The " npix" value identifying the cell to test (see the MOC recommendation for more details).
##### parent
Indicates the value to return if the tested cell is not included at the specified order, but a parent cell (at a lower order) is included.

#### Returned Value

##### astTestCell()
One if the specified cell is included in the Moc at the specified order, of (if " parent" is non-zero) a parent cell is included in the Moc. Zero otherwise.