node_statistics calc_node_statistics( Pop const& pop )
{
GPCXX_ASSERT( pop.size() > 0 );
size_t n = pop.size();
node_statistics stat;
for( size_t i=0 ; i<n ; ++i )
{
node_statistics tmp = calc_node_statistics_tree( pop[i] );
stat.num_nodes += tmp.num_nodes;
stat.num_terminals += tmp.num_terminals;
stat.num_unaries += tmp.num_unaries;
stat.num_binaries += tmp.num_binaries;
}
return stat;
}
std::vector< typename Pop::const_iterator >
selection( Pop const& pop , Fitness const& fitness )
{
GPCXX_ASSERT( pop.size() > 2 );
std::vector< typename Pop::const_iterator > s(2);
s[1] = s[0] = m_selector( pop , fitness );
while( s[0] == s[1] )
s[1] = m_selector( pop , fitness );
return s;
}