cop<KeyT,DataT,CompareT,AllocT>& cop<KeyT,DataT,CompareT,AllocT>
::copy_if(const property<value_type>& hasProperty, const cop<KeyT,DataT,CompareT,AllocT>& src)
{
if(this == &src) return keep_if(hasProperty);
// otherwise
clear();
const_iterator it = src.begin();
while(it != src.end()) {
if ( hasProperty(*it) ) insert(*it); it++;
}
return *this;
}
