From c09260d8b792bb1b9df770d1ce3d3e2d75fa4dff Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Fri, 6 Apr 2018 11:30:10 +0100
Subject: C++17

Updates resource pool... We don't need our own usage counter when
shared_ptr has a perfectly good one... So long as you remember it's one
too high cos we keep one in InUse.
---
 libadhocutil/resourcePool.h      |  3 +--
 libadhocutil/resourcePool.impl.h | 21 ++++++---------------
 2 files changed, 7 insertions(+), 17 deletions(-)

diff --git a/libadhocutil/resourcePool.h b/libadhocutil/resourcePool.h
index f65bf0f..609d710 100644
--- a/libadhocutil/resourcePool.h
+++ b/libadhocutil/resourcePool.h
@@ -20,7 +20,7 @@ namespace AdHoc {
 	class DLL_PUBLIC ResourceHandle {
 		public:
 			/// Handle to an allocated resource, the pool it belongs to and a count of active references.
-			typedef std::tuple<std::shared_ptr<Resource>, ResourcePool<Resource> *, std::atomic<unsigned int>> Object;
+			typedef std::tuple<std::shared_ptr<Resource>, ResourcePool<Resource> *> Object;
 
 			/// Create a reference to a new resource.
 			ResourceHandle(const std::shared_ptr<Object> &);
@@ -43,7 +43,6 @@ namespace AdHoc {
 			unsigned int handleCount() const;
 
 		private:
-			DLL_PRIVATE void incRef() const;
 			DLL_PRIVATE void decRef();
 			std::shared_ptr<Object> resource;
 	};
diff --git a/libadhocutil/resourcePool.impl.h b/libadhocutil/resourcePool.impl.h
index 3d2f089..7dce653 100644
--- a/libadhocutil/resourcePool.impl.h
+++ b/libadhocutil/resourcePool.impl.h
@@ -16,14 +16,12 @@ namespace AdHoc {
 	ResourceHandle<R>::ResourceHandle(const std::shared_ptr<Object> & o) :
 		resource(o)
 	{
-		incRef();
 	}
 
 	template <typename R>
 	ResourceHandle<R>::ResourceHandle(const ResourceHandle & rh) :
 		resource(rh.resource)
 	{
-		incRef();
 	}
 
 	template <typename R>
@@ -39,7 +37,8 @@ namespace AdHoc {
 	ResourceHandle<R>::handleCount() const
 	{
 		ASSERT(resource);
-		return std::get<2>(*resource);
+		// InUse has one, we don't count that
+		return resource.use_count() - 1;
 	}
 
 	template <typename R>
@@ -79,15 +78,6 @@ namespace AdHoc {
 			decRef();
 		}
 		resource = rh.resource;
-		incRef();
-	}
-
-	template <typename R>
-	void
-	ResourceHandle<R>::incRef() const
-	{
-		ASSERT(resource);
-		++std::get<2>(*resource);
 	}
 
 	template <typename R>
@@ -95,7 +85,8 @@ namespace AdHoc {
 	ResourceHandle<R>::decRef()
 	{
 		ASSERT(resource);
-		if (!--std::get<2>(*resource)) {
+		// InUse has one, we don't count that
+		if (resource.use_count() == 2) {
 			if (auto pool = std::get<1>(*resource)) {
 				if (std::uncaught_exception()) {
 					pool->discard(std::get<0>(*resource));
@@ -231,7 +222,7 @@ namespace AdHoc {
 			auto & r = available.front();
 			try {
 				testResource(r.get());
-				auto ro = std::make_shared<typename ResourceHandle<R>::Object>(r, this, 0);
+				auto ro = std::make_shared<typename ResourceHandle<R>::Object>(r, this);
 				available.pop_front();
 				inUse.insert({ std::this_thread::get_id(), ro });
 				return ro;
@@ -241,7 +232,7 @@ namespace AdHoc {
 				available.pop_front();
 			}
 		}
-		auto ro = std::make_shared<typename ResourceHandle<R>::Object>(createResource(), this, 0);
+		auto ro = std::make_shared<typename ResourceHandle<R>::Object>(createResource(), this);
 		inUse.insert({ std::this_thread::get_id(), ro });
 		return ro;
 	}
-- 
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