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#ifndef CACHE_H
#define CACHE_H
#include <map>
#include <memory>
template<typename Obj> class Cache {
public:
using Ptr = std::shared_ptr<Obj>;
virtual ~Cache() = default;
[[nodiscard]] Ptr
get(const std::string & key)
{
if (auto e = cached.find(key); e != cached.end()) {
return e->second;
}
return cached.emplace(key, construct(key)).first->second;
}
[[nodiscard]] virtual Ptr
construct(const std::string & key) const
{
return std::make_shared<Obj>(key);
}
private:
std::map<std::string, Ptr> cached;
};
#endif
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