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#pragma once
#include "pre_config.hpp"
#include <cassert>
#include <memory>
#include <type_traits>
namespace cru {
template <typename T>
class SelfResovable;
template <typename T>
class ObjectResovler {
friend SelfResovable<T>;
private:
ObjectResovler(const std::shared_ptr<T*>& resolver) : resolver_(resolver) {}
public:
ObjectResovler(const ObjectResovler&) = default;
ObjectResovler& operator=(const ObjectResovler&) = default;
ObjectResovler(ObjectResovler&&) = default;
ObjectResovler& operator=(ObjectResovler&&) = default;
~ObjectResovler() = default;
T* Resolve() const {
// resolver_ is null only when this has been moved.
// You shouldn't resolve a moved resolver. So assert it.
assert(resolver_);
return *resolver_;
}
private:
std::shared_ptr<T*> resolver_;
};
template <typename T>
class SelfResovable {
public:
SelfResovable() : resolver_(new T*(static_cast<T*>(this))) {}
SelfResovable(const SelfResovable&) = delete;
SelfResovable& operator=(const SelfResovable&) = delete;
SelfResovable(SelfResovable&&) = delete;
SelfResovable& operator=(SelfResovable&&) = delete;
virtual ~SelfResovable() { (*resolver_) = nullptr; }
ObjectResovler<T> CreateResolver() { return ObjectResovler<T>(resolver_); }
private:
std::shared_ptr<T*> resolver_;
};
} // namespace cru
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