From 5864e5abc43b201c3801fa39a2fcaf9e3a9e8914 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Sun, 27 Feb 2022 12:54:10 +0100
Subject: refactor: use dependency injection

---
 src/DI/auto_wirable.hpp       | 28 +++++++++++++++++++
 src/DI/auto_wirable.tpp       | 10 +++++++
 src/DI/container.hpp          | 65 +++++++++++++++++++++++++++++++++++++++++++
 src/DI/container.tpp          | 53 +++++++++++++++++++++++++++++++++++
 src/DI/function_wrapper.hpp   | 20 +++++++++++++
 src/DI/function_wrapper.tpp   |  9 ++++++
 src/DI/interfaces/wrapper.hpp | 17 +++++++++++
 src/DI/object_type.cpp        | 18 ++++++++++++
 src/DI/object_type.hpp        | 35 +++++++++++++++++++++++
 src/DI/object_wrapper.hpp     | 20 +++++++++++++
 src/DI/object_wrapper.tpp     |  9 ++++++
 11 files changed, 284 insertions(+)
 create mode 100644 src/DI/auto_wirable.hpp
 create mode 100644 src/DI/auto_wirable.tpp
 create mode 100644 src/DI/container.hpp
 create mode 100644 src/DI/container.tpp
 create mode 100644 src/DI/function_wrapper.hpp
 create mode 100644 src/DI/function_wrapper.tpp
 create mode 100644 src/DI/interfaces/wrapper.hpp
 create mode 100644 src/DI/object_type.cpp
 create mode 100644 src/DI/object_type.hpp
 create mode 100644 src/DI/object_wrapper.hpp
 create mode 100644 src/DI/object_wrapper.tpp

(limited to 'src/DI')

diff --git a/src/DI/auto_wirable.hpp b/src/DI/auto_wirable.hpp
new file mode 100644
index 0000000..13d252e
--- /dev/null
+++ b/src/DI/auto_wirable.hpp
@@ -0,0 +1,28 @@
+#pragma once
+
+#include "DI/container.hpp"
+
+#include <memory>
+
+// NOLINTNEXTLINE(cppcoreguidelines-special-member-functions)
+class IGenericAutoWirable
+{
+public:
+	virtual ~IGenericAutoWirable() = default;
+};
+
+template <class Interface>
+class IAutoWirable : public IGenericAutoWirable
+{
+public:
+	static Interface resolve();
+};
+
+template <class Interface, class ObjectImpl, class... Dependencies>
+class AutoWirable : public IAutoWirable<Interface>
+{
+public:
+	static std::shared_ptr<Interface> resolve(const Container &container);
+};
+
+#include "auto_wirable.tpp"
diff --git a/src/DI/auto_wirable.tpp b/src/DI/auto_wirable.tpp
new file mode 100644
index 0000000..6c0d111
--- /dev/null
+++ b/src/DI/auto_wirable.tpp
@@ -0,0 +1,10 @@
+#pragma once
+
+#include "auto_wirable.hpp"
+
+template <class Interface, class ObjectImpl, class... Dependencies>
+std::shared_ptr<Interface>
+AutoWirable<Interface, ObjectImpl, Dependencies...>::resolve(const Container &container)
+{
+	return std::make_shared<ObjectImpl>(container.get<Dependencies>()...);
+}
diff --git a/src/DI/container.hpp b/src/DI/container.hpp
new file mode 100644
index 0000000..2402894
--- /dev/null
+++ b/src/DI/container.hpp
@@ -0,0 +1,65 @@
+#pragma once
+
+#include "DI/object_type.hpp"
+#include "interfaces/wrapper.hpp"
+
+#include <functional>
+#include <memory>
+#include <type_traits>
+#include <unordered_map>
+
+class Container;
+
+template <typename Interface>
+class BindingBuilder
+{
+public:
+	explicit BindingBuilder(Container *container);
+
+	template <class ObjectImpl,
+			  class = std::enable_if_t<std::is_base_of_v<Interface, ObjectImpl>>>
+	void to();
+
+	void to_factory(Interface func);
+
+private:
+	Container *_container;
+};
+
+template <typename Satan>
+struct is_func : public std::false_type // NOLINT(readability-identifier-naming)
+{
+};
+
+template <typename Satan, typename... Args>
+struct is_func<std::function<Satan(Args...)>> : public std::true_type
+{
+};
+
+class Container
+{
+public:
+	Container() = default;
+
+	template <class Interface>
+	BindingBuilder<Interface> bind();
+
+	template <class Interface, class = std::enable_if_t<std::is_abstract_v<Interface>>>
+	std::shared_ptr<Interface> get() const;
+
+	/*
+	template <typename Interface,
+			  typename = std::enable_if_t<
+				  !std::is_abstract_v<Interface> &&
+				  std::is_invocable_v<Interface, typename Interface::argument_type>>>
+	Interface get() const;
+	*/
+
+	template <typename Interface, typename = std::enable_if_t<is_func<Interface>::value>>
+	Interface get() const;
+
+	std::unordered_map<BaseObjectType, std::shared_ptr<IGenericWrapper>, ObjectTypeHasher>
+		bindings;
+};
+
+#include "container.tpp"
diff --git a/src/DI/container.tpp b/src/DI/container.tpp
new file mode 100644
index 0000000..21bf81a
--- /dev/null
+++ b/src/DI/container.tpp
@@ -0,0 +1,53 @@
+#pragma once
+
+#include "container.hpp"
+
+#include "function_wrapper.hpp"
+#include "object_wrapper.hpp"
+
+template <class Interface>
+BindingBuilder<Interface>::BindingBuilder(Container *container) : _container(container)
+{
+}
+
+template <class Interface>
+template <class ObjectImpl, class>
+void BindingBuilder<Interface>::to()
+{
+	_container->bindings.emplace(
+		ObjectType<Interface>(),
+		std::dynamic_pointer_cast<IGenericWrapper>(
+			std::make_shared<ObjectWrapper<Interface, ObjectImpl>>(*_container)));
+}
+
+template <class Interface>
+void BindingBuilder<Interface>::to_factory(Interface func)
+{
+	_container->bindings.emplace(ObjectType<Interface>(),
+								 std::dynamic_pointer_cast<IGenericWrapper>(
+									 std::make_shared<FunctionWrapper<Interface>>(func)));
+}
+
+template <class Interface>
+BindingBuilder<Interface> Container::bind()
+{
+	return BindingBuilder<Interface>(this);
+}
+
+template <class Interface, class>
+std::shared_ptr<Interface> Container::get() const
+{
+	auto wrapper = std::dynamic_pointer_cast<IWrapper<std::shared_ptr<Interface>>>(
+		bindings.at(ObjectType<Interface>()));
+
+	return wrapper->get();
+}
+
+template <typename Interface, typename>
+Interface Container::get() const
+{
+	auto wrapper = std::dynamic_pointer_cast<IWrapper<Interface>>(
+		bindings.at(ObjectType<Interface>()));
+
+	return wrapper->get();
+}
diff --git a/src/DI/function_wrapper.hpp b/src/DI/function_wrapper.hpp
new file mode 100644
index 0000000..e4b6779
--- /dev/null
+++ b/src/DI/function_wrapper.hpp
@@ -0,0 +1,20 @@
+#pragma once
+
+#include "DI/container.hpp"
+#include "DI/interfaces/wrapper.hpp"
+
+#include <memory>
+
+template <class Interface>
+class FunctionWrapper : public IWrapper<Interface>
+{
+public:
+	explicit FunctionWrapper(Interface func) : _func(func) {}
+
+	[[nodiscard]] Interface get() const;
+
+private:
+	const Interface _func;
+};
+
+#include "function_wrapper.tpp"
diff --git a/src/DI/function_wrapper.tpp b/src/DI/function_wrapper.tpp
new file mode 100644
index 0000000..4e09957
--- /dev/null
+++ b/src/DI/function_wrapper.tpp
@@ -0,0 +1,9 @@
+#pragma once
+
+#include "function_wrapper.hpp"
+
+template <class Interface>
+Interface FunctionWrapper<Interface>::get() const
+{
+	return _func;
+}
diff --git a/src/DI/interfaces/wrapper.hpp b/src/DI/interfaces/wrapper.hpp
new file mode 100644
index 0000000..3cc75a0
--- /dev/null
+++ b/src/DI/interfaces/wrapper.hpp
@@ -0,0 +1,17 @@
+#pragma once
+
+#include <memory>
+
+// NOLINTNEXTLINE(cppcoreguidelines-special-member-functions)
+class IGenericWrapper
+{
+public:
+	virtual ~IGenericWrapper() = default;
+};
+
+template <class Interface>
+class IWrapper : public IGenericWrapper
+{
+public:
+	[[nodiscard]] virtual Interface get() const = 0;
+};
diff --git a/src/DI/object_type.cpp b/src/DI/object_type.cpp
new file mode 100644
index 0000000..60c7c78
--- /dev/null
+++ b/src/DI/object_type.cpp
@@ -0,0 +1,18 @@
+#include "object_type.hpp"
+
+BaseObjectType::BaseObjectType(const std::type_info &type_info) : _type_info(type_info) {}
+
+bool BaseObjectType::operator==(const BaseObjectType &object_type) const
+{
+	return hash() == object_type.hash();
+}
+
+std::size_t BaseObjectType::hash() const
+{
+	return _type_info.hash_code();
+}
+
+std::size_t ObjectTypeHasher::operator()(const BaseObjectType &object_type) const
+{
+	return object_type.hash();
+}
diff --git a/src/DI/object_type.hpp b/src/DI/object_type.hpp
new file mode 100644
index 0000000..f690a64
--- /dev/null
+++ b/src/DI/object_type.hpp
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <typeinfo>
+
+class BaseObjectType
+{
+public:
+	explicit BaseObjectType(const std::type_info &type_info);
+
+	bool operator==(const BaseObjectType &object_type) const;
+
+	[[nodiscard]] std::size_t hash() const;
+
+private:
+	const std::type_info &_type_info;
+};
+
+template <class Object>
+class ObjectType : public BaseObjectType
+{
+public:
+	ObjectType() : BaseObjectType(typeid(Object)) {}
+};
+
+class IObjectTypeHasher
+{
+public:
+	virtual std::size_t operator()(const BaseObjectType &object_type) const = 0;
+};
+
+class ObjectTypeHasher : public IObjectTypeHasher
+{
+public:
+	std::size_t operator()(const BaseObjectType &object_type) const override;
+};
diff --git a/src/DI/object_wrapper.hpp b/src/DI/object_wrapper.hpp
new file mode 100644
index 0000000..0ae66df
--- /dev/null
+++ b/src/DI/object_wrapper.hpp
@@ -0,0 +1,20 @@
+#pragma once
+
+#include "DI/container.hpp"
+#include "DI/interfaces/wrapper.hpp"
+
+#include <memory>
+
+template <class Interface, class ObjectImpl>
+class ObjectWrapper : public IWrapper<std::shared_ptr<Interface>>
+{
+public:
+	explicit ObjectWrapper(const Container &container) : _container(container) {}
+
+	[[nodiscard]] std::shared_ptr<Interface> get() const;
+
+private:
+	const Container &_container;
+};
+
+#include "object_wrapper.tpp"
diff --git a/src/DI/object_wrapper.tpp b/src/DI/object_wrapper.tpp
new file mode 100644
index 0000000..7efefc4
--- /dev/null
+++ b/src/DI/object_wrapper.tpp
@@ -0,0 +1,9 @@
+#pragma once
+
+#include "object_wrapper.hpp"
+
+template <class Interface, class ObjectImpl>
+std::shared_ptr<Interface> ObjectWrapper<Interface, ObjectImpl>::get() const
+{
+	return ObjectImpl::resolve(_container);
+}
-- 
cgit v1.2.3-18-g5258