// create a new Merge operator that combines the given maps and
// fills an output map with the merged information
MergeOperator *mo = new MergeOperator();

// assign input and output. operator and maps will automatically
// be attached if they are not yet.
env->addInput( mo, pc1 );
env->addInput( mo, pc2 );
env->addOutput( mo, pcOut );

// perform the update operation on the full maps
// (partial updates not yet supported)
mo->updateAll();