def by_layer(self, layer):
"""Return the chosen Link using the layer
:param layer: the number of layer
:type layer: int
"""
c_fieldinfo = libvect.Vect_get_field(self.c_mapinfo, layer)
return Link(c_fieldinfo=c_fieldinfo) if c_fieldinfo else None
def by_number(self, number):
c_fieldinfo = libvect.Vect_get_field(self.c_mapinfo, number)
return Link(c_fieldinfo=c_fieldinfo)
