eck/concept_check.htm">Concept
Checking</A> for more details about concept checking).

<P>
Next we need to think about what vertex or edge properties will be
used in the algorithm. In this case, the only property is vertex
color. The most flexible way to specify access to vertex color is to
use the propery map interface. This gives the user of the
algorithm the ability to decide how they want to store the properties.
Since we will need to both read and write the colors we specify the
requirements as <a
href