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/alloc_functor.tpp | 165 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 165 insertions(+)
 create mode 100644 src/DI/alloc_functor.tpp

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

diff --git a/src/DI/alloc_functor.tpp b/src/DI/alloc_functor.tpp
new file mode 100644
index 0000000..d3f6946
--- /dev/null
+++ b/src/DI/alloc_functor.tpp
@@ -0,0 +1,165 @@
+#pragma once
+
+#include "alloc_functor.hpp"
+
+template <class Return>
+template <class... Args>
+auto InvokeReturnWrapper<Return>::call(Args &&...args) -> Return
+{
+	return std::invoke(std::forward<Args>(args)...);
+}
+
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define ALLOC_FUNCTOR_TEMPLATE                                                           \
+	template <class Function, class Allocator, class Return, class... Args>
+
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define ALLOC_FUNCTOR AllocFunctor<Function, Allocator, Return(Args...)>
+
+ALLOC_FUNCTOR_TEMPLATE
+ALLOC_FUNCTOR::AllocFunctor(Target &&function)
+	: _function(std::piecewise_construct, std::forward_as_tuple(std::move(function)),
+				std::forward_as_tuple())
+{
+}
+
+ALLOC_FUNCTOR_TEMPLATE
+ALLOC_FUNCTOR::AllocFunctor(const Target &function, const Alloc &allocator)
+	: _function(std::piecewise_construct, std::forward_as_tuple(function),
+				std::forward_as_tuple(allocator))
+{
+}
+
+ALLOC_FUNCTOR_TEMPLATE
+ALLOC_FUNCTOR::AllocFunctor(const Target &function, Alloc &&allocator)
+	: _function(std::piecewise_construct, std::forward_as_tuple(function),
+				std::forward_as_tuple(std::move(allocator)))
+{
+}
+
+ALLOC_FUNCTOR_TEMPLATE
+ALLOC_FUNCTOR::AllocFunctor(Target &&function, Alloc &&allocator)
+	: _function(std::piecewise_construct, std::forward_as_tuple(std::move(function)),
+				std::forward_as_tuple(std::move(allocator)))
+{
+}
+
+ALLOC_FUNCTOR_TEMPLATE
+auto ALLOC_FUNCTOR::operator()(Args &&...args) -> Return
+{
+	using Invoker = InvokeReturnWrapper<Return>;
+
+	return Invoker::call(_function.first(), std::forward<Args>(args)...);
+}
+
+ALLOC_FUNCTOR_TEMPLATE
+auto ALLOC_FUNCTOR::target() const -> const Target &
+{
+	return _function.first();
+}
+
+ALLOC_FUNCTOR_TEMPLATE
+auto ALLOC_FUNCTOR::get_allocator() const -> const Alloc &
+{
+	return _function.second();
+}
+
+ALLOC_FUNCTOR_TEMPLATE
+auto ALLOC_FUNCTOR::clone() const -> AllocFunctor *
+{
+	using AllocTraits = std::allocator_traits<Alloc>;
+
+	using AllocHelper = typename RebindAllocHelper<AllocTraits, AllocFunctor>::type;
+
+	auto alloc_helper = AllocHelper(_function.second());
+
+	using Destructor = AllocDestructor<AllocHelper>;
+
+	auto hold = std::unique_ptr<AllocFunctor, Destructor>(alloc_helper.allocate(1),
+														  _Dp(alloc_helper, 1));
+
+	::new (static_cast<void *>(hold.get()))
+		AllocFunctor(_function.first(), _Alloc(alloc_helper));
+
+	return hold.release();
+}
+
+ALLOC_FUNCTOR_TEMPLATE
+void ALLOC_FUNCTOR::destroy() noexcept
+{
+	_function.~CompressedPair<Target, Alloc>();
+}
+
+ALLOC_FUNCTOR_TEMPLATE
+void ALLOC_FUNCTOR::destroy_and_delete(AllocFunctor *functor)
+{
+	using AllocTraits = std::allocator_traits<Alloc>;
+
+	using FunctorAlloc = typename RebindAllocHelper<AllocTraits, AllocFunctor>::type;
+
+	auto functor_alloc = FunctorAlloc(functor->get_allocator());
+
+	functor->destroy();
+	functor_alloc.deallocate(functor, 1);
+}
+
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define DEFAULT_ALLOC_FUNCTOR_TEMPLATE                                                   \
+	template <class Function, class Return, class... Args>
+
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define DEFAULT_ALLOC_FUNCTOR DefaultAllocFunctor<Function, Return(Args...)>
+
+DEFAULT_ALLOC_FUNCTOR_TEMPLATE
+DEFAULT_ALLOC_FUNCTOR::DefaultAllocFunctor(Target &&function)
+	: _function(std::move(function))
+{
+}
+
+DEFAULT_ALLOC_FUNCTOR_TEMPLATE
+DEFAULT_ALLOC_FUNCTOR::DefaultAllocFunctor(const Target &function) : _function(function)
+{
+}
+
+DEFAULT_ALLOC_FUNCTOR_TEMPLATE
+auto DEFAULT_ALLOC_FUNCTOR::operator()(Args &&...args) -> Return
+{
+	using Invoker = InvokeReturnWrapper<Return>;
+
+	return Invoker::call(_function, std::forward<Args>(args)...);
+}
+
+DEFAULT_ALLOC_FUNCTOR_TEMPLATE
+auto DEFAULT_ALLOC_FUNCTOR::target() const -> const Target &
+{
+	return _function;
+}
+
+DEFAULT_ALLOC_FUNCTOR_TEMPLATE
+auto DEFAULT_ALLOC_FUNCTOR::clone() const -> DefaultAllocFunctor *
+{
+	std::allocator<DefaultAllocFunctor> allocator;
+
+	DefaultAllocFunctor *functor_ptr = allocator.allocate(1);
+
+	// NOLINTNEXTLINE(cppcoreguidelines-owning-memory)
+	auto *res = ::new (static_cast<void *>(functor_ptr)) DefaultAllocFunctor(_function);
+
+	return res;
+}
+
+DEFAULT_ALLOC_FUNCTOR_TEMPLATE
+void DEFAULT_ALLOC_FUNCTOR::destroy() noexcept
+{
+	_function.~_Target();
+}
+
+DEFAULT_ALLOC_FUNCTOR_TEMPLATE
+void DEFAULT_ALLOC_FUNCTOR::destroy_and_delete(DefaultAllocFunctor *function)
+{
+	function->destroy();
+
+	std::allocator<DefaultAllocFunctor> allocator;
+
+	allocator.deallocate(function, 1);
+}
-- 
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