decay_graph.h

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#ifndef DECAY_GRAPH_H
#define DECAY_GRAPH_H
 
#include <mutex>
#include <optional>
#include <string>
#include <unordered_map>
#include <vector>
 
#include "dynamic_registry.h"
 
struct DecayTag;
struct ObservableTag;
 
using DecayId = SymbolId<DecayTag>;
 
using ObservableId = SymbolId<ObservableTag>;
 
class DecayGraph {
public:
    static DecayGraph& instance();
 
    void link(const DecayId& decay, const ObservableId& obs);
 
    std::vector<ObservableId> observables_of(const DecayId& decay) const;
 
    std::optional<DecayId> parent_of(const ObservableId& obs) const;
 
    bool has_observables(const DecayId& decay) const;
 
private:
    mutable std::mutex m_;  
 
    std::unordered_map<std::string, std::vector<ObservableId>> graph_;
 
    std::unordered_map<std::string, DecayId> parent_;
};
 
#endif // DECAY_GRAPH_H