IdentifierGroup.h

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#pragma once
#include <unordered_set>
 
namespace catapult { namespace utils {
 
    template<typename TIdentifier, typename TGroupingKey, typename TIdentifierHasher>
    class IdentifierGroup {
    public:
        using Identifiers = std::unordered_set<TIdentifier, TIdentifierHasher>;
 
        using GroupingKeyType = TGroupingKey;
 
    public:
        explicit IdentifierGroup(const TGroupingKey& key) : m_key(key)
        {}
 
    public:
        const TGroupingKey& key() const {
            return m_key;
        }
 
        const Identifiers& identifiers() const {
            return m_identifiers;
        }
 
    public:
        bool empty() const {
            return m_identifiers.empty();
        }
 
        size_t size() const {
            return m_identifiers.size();
        }
 
    public:
        void add(const TIdentifier& identifier) {
            m_identifiers.insert(identifier);
        }
 
        void remove(const TIdentifier& identifier) {
            m_identifiers.erase(identifier);
        }
 
    private:
        TGroupingKey m_key;
        Identifiers m_identifiers;
    };
}}