service_registry.h

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#pragma once
 
#include <typeindex>
#include <typeinfo>
#include <unordered_map>
 
namespace librats {
 
class ServiceRegistry {
public:
    template <class I>
    void provide(I* service) {
        services_[std::type_index(typeid(I))] = static_cast<void*>(service);
    }
 
    template <class I>
    I* get() const {
        auto it = services_.find(std::type_index(typeid(I)));
        return it == services_.end() ? nullptr : static_cast<I*>(it->second);
    }
 
private:
    std::unordered_map<std::type_index, void*> services_;
};
 
} // namespace librats