From b36d072ad7a7b9c6e30fcb25d6bbb001a8393468 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Sun, 10 Apr 2022 17:20:49 +0200
Subject: refactor: add factory class & make DI container return unique ptrs

---
 src/DI/value_functor.tpp | 189 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 189 insertions(+)
 create mode 100644 src/DI/value_functor.tpp

(limited to 'src/DI/value_functor.tpp')

diff --git a/src/DI/value_functor.tpp b/src/DI/value_functor.tpp
new file mode 100644
index 0000000..3665f18
--- /dev/null
+++ b/src/DI/value_functor.tpp
@@ -0,0 +1,189 @@
+#pragma once
+
+#include "value_functor.hpp"
+
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define VALUE_FUNCTOR_TEMPLATE template <class Return, class... Args>
+
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define VALUE_FUNCTOR ValueFunctor<Return(Args...)>
+
+VALUE_FUNCTOR_TEMPLATE
+VALUE_FUNCTOR::ValueFunctor() noexcept : _functor(nullptr) {}
+
+VALUE_FUNCTOR_TEMPLATE
+template <class Function, class Allocator>
+VALUE_FUNCTOR::ValueFunctor(Function &&function, const Allocator &allocator)
+	: _functor(nullptr)
+{
+	using AllocTraits = std::allocator_traits<Allocator>;
+
+	using Functor = CopyableFunctor<Function, Allocator, Return(Args...)>;
+
+	using FunctorAlloc = typename RebindAllocHelper<AllocTraits, Functor>::type;
+
+	if (not_null(function))
+	{
+		auto functor_alloc = FunctorAlloc(allocator);
+
+		if (sizeof(Functor) <= sizeof(_buf) &&
+			std::is_nothrow_copy_constructible<Function>::value &&
+			std::is_nothrow_copy_constructible<FunctorAlloc>::value)
+		{
+			// NOLINTNEXTLINE(cppcoreguidelines-owning-memory)
+			_functor = ::new (static_cast<void *>(&_buf))
+				Functor(std::forward<Function>(function), Allocator(functor_alloc));
+		}
+		else
+		{
+			using Destructor = AllocDestructor<FunctorAlloc>;
+
+			auto hold = std::unique_ptr<TargetFunctor, Destructor>(
+				functor_alloc.allocate(1), Destructor(functor_alloc, 1));
+
+			::new (static_cast<void *>(hold.get()))
+				Functor(std::forward<Function>(function), Allocator(allocator));
+
+			_functor = hold.release();
+		}
+	}
+}
+
+VALUE_FUNCTOR_TEMPLATE
+VALUE_FUNCTOR::ValueFunctor(const ValueFunctor &val_functor)
+{
+	if (val_functor._functor == nullptr)
+	{
+		_functor = nullptr;
+	}
+	else if (static_cast<void *>(val_functor._functor) == &val_functor._buf)
+	{
+		_functor = _as_copyable_functor(&_buf);
+		val_functor._functor->clone(_functor);
+	}
+	else
+	{
+		_functor = val_functor._functor->clone();
+	}
+}
+
+VALUE_FUNCTOR_TEMPLATE
+VALUE_FUNCTOR::ValueFunctor(ValueFunctor &&val_functor) noexcept
+{
+	if (val_functor._functor == nullptr)
+	{
+		_functor = nullptr;
+	}
+	else if (static_cast<void *>(val_functor._functor) == &val_functor._buf)
+	{
+		_functor = _as_copyable_functor(&_buf);
+		val_functor._functor->clone(_functor);
+	}
+	else
+	{
+		_functor = val_functor._functor;
+		val_functor._functor = nullptr;
+	}
+}
+
+VALUE_FUNCTOR_TEMPLATE
+VALUE_FUNCTOR::~ValueFunctor()
+{
+	if (static_cast<void *>(_functor) == &_buf)
+	{
+		_functor->destroy();
+	}
+	else if (_functor)
+	{
+		_functor->destroy_deallocate();
+	}
+}
+
+VALUE_FUNCTOR_TEMPLATE
+auto VALUE_FUNCTOR::operator=(ValueFunctor &&val_functor) noexcept -> ValueFunctor &
+{
+	*this = nullptr;
+
+	if (val_functor._functor == nullptr)
+	{
+		_functor = nullptr;
+	}
+	else if (static_cast<void *>(val_functor._functor) == &val_functor._buf)
+	{
+		_functor = _as_copyable_functor(&_buf);
+		val_functor._functor->clone(_functor);
+	}
+	else
+	{
+		_functor = val_functor._functor;
+		val_functor._functor = nullptr;
+	}
+
+	return *this;
+}
+
+VALUE_FUNCTOR_TEMPLATE
+auto VALUE_FUNCTOR::operator=(std::nullptr_t) -> ValueFunctor &
+{
+	TargetFunctor *old_functor = _functor;
+
+	_functor = nullptr;
+
+	if (static_cast<void *>(old_functor) == &_buf)
+	{
+		old_functor->destroy();
+	}
+	else if (old_functor)
+	{
+		old_functor->destroy_deallocate();
+	}
+
+	return *this;
+}
+
+VALUE_FUNCTOR_TEMPLATE
+auto VALUE_FUNCTOR::operator()(Args &&...args) const -> Return
+{
+	if (_functor == nullptr)
+	{
+		std::abort();
+	}
+
+	return (*_functor)(std::forward<Args>(args)...);
+}
+
+VALUE_FUNCTOR_TEMPLATE
+VALUE_FUNCTOR::operator bool() const noexcept
+{
+	return _functor != nullptr;
+}
+
+VALUE_FUNCTOR_TEMPLATE
+auto VALUE_FUNCTOR::target_type() const noexcept -> const std::type_info &
+{
+	if (_functor == nullptr)
+	{
+		return typeid(void);
+	}
+
+	return _functor->target_type();
+}
+
+VALUE_FUNCTOR_TEMPLATE
+template <typename Target>
+auto VALUE_FUNCTOR::target() const noexcept -> const Target *
+{
+	if (_functor == nullptr)
+	{
+		return nullptr;
+	}
+
+	return static_cast<const Target *>(_functor->target(typeid(Target)));
+}
+
+VALUE_FUNCTOR_TEMPLATE
+auto VALUE_FUNCTOR::_as_copyable_functor(void *function_ptr) -> TargetFunctor *
+{
+	// NOLINTNEXTLINE(cppcoreguidelines-pro-type-reinterpret-cast)
+	return reinterpret_cast<TargetFunctor *>(function_ptr);
+}
-- 
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