Optional heuristic

optional.cpp

struct Edge;
struct Vertex;

void enqueue(Edge *, double);
double someHeuristic(Vertex*, Vertex *);


// -----------------



#include <optional>
#include <functional>


using heuristic = std::function<double(Vertex*, Vertex*)>;

void singleFunction(Vertex* start, Vertex* end, std::optional<heuristic> heuristic=std::nullopt) 
{
    Edge  *edge=nullptr;
    double cost=10;

    if (heuristic)
    {
        enqueue(edge, cost + (*heuristic)(start,end));
    } 
    else 
    {
        enqueue(edge, cost);
    }
}




int main()
{
    Vertex *start{nullptr};
    Vertex *end  {nullptr};


    singleFunction(start,end);
    singleFunction(start,end,someHeuristic);
}