85 lines
2.1 KiB
C++
85 lines
2.1 KiB
C++
#ifndef OBJECT_PROXY_HPP
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#define OBJECT_PROXY_HPP
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#include <memory>
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namespace matador::object {
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class basic_object_proxy {
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public:
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virtual ~basic_object_proxy() = default;
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[[nodiscard]] virtual void *get() const = 0;
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};
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template < typename Type >
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class object_proxy;
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template < typename Type >
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class object_resolver {
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public:
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virtual ~object_resolver() = default;
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virtual Type* resolve(const object_proxy<Type> &proxy) const = 0;
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};
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template < typename Type >
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class simple_object_resolver final : public object_resolver<Type> {
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public:
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simple_object_resolver() = default;
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explicit simple_object_resolver(Type* obj)
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: obj_(obj) {}
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explicit simple_object_resolver(std::unique_ptr<Type> obj)
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: obj_(std::move(obj)) {}
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Type* resolve(const object_proxy<Type> &/*proxy*/) const override {
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return obj_.get();
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}
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private:
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std::unique_ptr<Type> obj_{};
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};
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template<class Type>
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class object_proxy final : public basic_object_proxy {
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public:
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object_proxy() = default;
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explicit object_proxy(Type* obj)
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: resolver_(std::make_unique<simple_object_resolver<Type>>(obj)) {}
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explicit object_proxy(std::unique_ptr<Type> obj)
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: resolver_(std::move(obj)) {}
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[[nodiscard]] void *get() const override { return static_cast<void*>(pointer()); }
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Type* operator->() const { return pointer(); }
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Type& operator*() { return *pointer(); }
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const Type& operator*() const { return *pointer(); }
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Type* pointer() const { return resolve(); }
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Type& ref() { return *pointer(); }
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const Type& ref() const { return *pointer(); }
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void reset(Type* obj) {
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resolver_ = std::make_unique<simple_object_resolver<Type>>(obj);
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}
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void reset(std::unique_ptr<Type> obj) {
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resolver_ = std::make_unique<simple_object_resolver<Type>>(std::move(obj));
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}
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void reset(std::unique_ptr<object_resolver<Type>> &&resolver) {
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resolver_ = std::move(resolver);
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}
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private:
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Type* resolve() const {
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return resolver_->resolve(*this);
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}
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private:
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std::unique_ptr<object_resolver<Type>> resolver_{std::make_unique<simple_object_resolver<Type>>()};
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};
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}
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#endif //OBJECT_PROXY_HPP
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