From 9046d4a5485452802b756869b7d27056ba9ea9d7 Mon Sep 17 00:00:00 2001
From: bunnei <bunneidev@gmail.com>
Date: Sun, 24 Nov 2019 20:15:51 -0500
Subject: kernel: Replace usage of boost::intrusive_ptr with std::shared_ptr
 for kernel objects. (#3154)

* kernel: Replace usage of boost::intrusive_ptr with std::shared_ptr for kernel objects.

- See https://github.com/citra-emu/citra/pull/4710 for details.
---
 src/core/hle/kernel/object.h | 30 +++++++++---------------------
 1 file changed, 9 insertions(+), 21 deletions(-)

(limited to 'src/core/hle/kernel/object.h')

diff --git a/src/core/hle/kernel/object.h b/src/core/hle/kernel/object.h
index a6faeb83b..bbbb4e7cc 100644
--- a/src/core/hle/kernel/object.h
+++ b/src/core/hle/kernel/object.h
@@ -5,10 +5,9 @@
 #pragma once
 
 #include <atomic>
+#include <memory>
 #include <string>
 
-#include <boost/smart_ptr/intrusive_ptr.hpp>
-
 #include "common/common_types.h"
 
 namespace Kernel {
@@ -32,7 +31,7 @@ enum class HandleType : u32 {
     ServerSession,
 };
 
-class Object : NonCopyable {
+class Object : NonCopyable, public std::enable_shared_from_this<Object> {
 public:
     explicit Object(KernelCore& kernel);
     virtual ~Object();
@@ -61,35 +60,24 @@ protected:
     KernelCore& kernel;
 
 private:
-    friend void intrusive_ptr_add_ref(Object*);
-    friend void intrusive_ptr_release(Object*);
-
-    std::atomic<u32> ref_count{0};
     std::atomic<u32> object_id{0};
 };
 
-// Special functions used by boost::instrusive_ptr to do automatic ref-counting
-inline void intrusive_ptr_add_ref(Object* object) {
-    object->ref_count.fetch_add(1, std::memory_order_relaxed);
-}
-
-inline void intrusive_ptr_release(Object* object) {
-    if (object->ref_count.fetch_sub(1, std::memory_order_acq_rel) == 1) {
-        delete object;
-    }
-}
-
 template <typename T>
-using SharedPtr = boost::intrusive_ptr<T>;
+std::shared_ptr<T> SharedFrom(T* raw) {
+    if (raw == nullptr)
+        return nullptr;
+    return std::static_pointer_cast<T>(raw->shared_from_this());
+}
 
 /**
  * Attempts to downcast the given Object pointer to a pointer to T.
  * @return Derived pointer to the object, or `nullptr` if `object` isn't of type T.
  */
 template <typename T>
-inline SharedPtr<T> DynamicObjectCast(SharedPtr<Object> object) {
+inline std::shared_ptr<T> DynamicObjectCast(std::shared_ptr<Object> object) {
     if (object != nullptr && object->GetHandleType() == T::HANDLE_TYPE) {
-        return boost::static_pointer_cast<T>(object);
+        return std::static_pointer_cast<T>(object);
     }
     return nullptr;
 }
-- 
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