Searchable.h

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#pragma once 


template<typename this_t, typename... Args>
class Searchable {
public:

    [[nodiscard]]  virtual int  neighbors() const = 0; // how many neighbors do I have?
    
    virtual void expand_to_neighbor(int k)  = 0; // modifies this hypothesis rather than making a new one
    

    [[nodiscard]]  virtual this_t  make_neighbor(int k) const {
        this_t out =  *static_cast<this_t*>(const_cast<Searchable<this_t,Args...>*>(this));
        out.expand_to_neighbor(k);
        return out; 
    }
    
    virtual double neighbor_prior(int k)    = 0; // what is the prior of this neighbor?

     
    virtual void complete() = 0;                        
    
    [[nodiscard]]  virtual bool is_evaluable() const       = 0; 
    
};