From 01cf7a585de2942562837077dff73968562b91f3 Mon Sep 17 00:00:00 2001
From: Martin Neupauer <martin.neupauer@10gen.com>
Date: Mon, 9 Jul 2018 16:20:02 -0700
Subject: SERVER-35940 Remove IntrusiveCounter

---
 src/mongo/util/intrusive_counter.cpp | 10 +------
 src/mongo/util/intrusive_counter.h   | 57 +-----------------------------------
 2 files changed, 2 insertions(+), 65 deletions(-)

diff --git a/src/mongo/util/intrusive_counter.cpp b/src/mongo/util/intrusive_counter.cpp
index 75c3b0f0acc..0e788aa2f2c 100644
--- a/src/mongo/util/intrusive_counter.cpp
+++ b/src/mongo/util/intrusive_counter.cpp
@@ -58,12 +58,4 @@ intrusive_ptr<const RCString> RCString::create(StringData s) {
     return ptr;
 }
 
-void IntrusiveCounterUnsigned::addRef() const {
-    ++counter;
-}
-
-void IntrusiveCounterUnsigned::release() const {
-    if (!--counter)
-        delete this;
-}
-}
+}  // namespace mongo
diff --git a/src/mongo/util/intrusive_counter.h b/src/mongo/util/intrusive_counter.h
index 76c1bee5a78..0d3b5fc50bf 100644
--- a/src/mongo/util/intrusive_counter.h
+++ b/src/mongo/util/intrusive_counter.h
@@ -38,54 +38,6 @@
 
 namespace mongo {
 
-/*
-  IntrusiveCounter is a sharable implementation of a reference counter that
-  objects can use to be compatible with boost::intrusive_ptr<>.
-
-  Some objects that use IntrusiveCounter are immutable, and only have
-  const methods.  This may require their pointers to be declared as
-  intrusive_ptr<const ClassName> .  In order to be able to share pointers to
-  these immutables, the methods associated with IntrusiveCounter are declared
-  as const, and the counter itself is marked as mutable.
-
-  IntrusiveCounter itself is abstract, allowing for multiple implementations.
-  For example, IntrusiveCounterUnsigned uses ordinary unsigned integers for
-  the reference count, and is good for situations where thread safety is not
-  required.  For others, other implementations using atomic integers should
-  be used.  For static objects, the implementations of addRef() and release()
-  can be overridden to do nothing.
- */
-class IntrusiveCounter {
-    MONGO_DISALLOW_COPYING(IntrusiveCounter);
-
-public:
-    IntrusiveCounter() = default;
-    virtual ~IntrusiveCounter(){};
-
-    // these are here for the boost intrusive_ptr<> class
-    friend inline void intrusive_ptr_add_ref(const IntrusiveCounter* pIC) {
-        pIC->addRef();
-    };
-    friend inline void intrusive_ptr_release(const IntrusiveCounter* pIC) {
-        pIC->release();
-    };
-
-    virtual void addRef() const = 0;
-    virtual void release() const = 0;
-};
-
-class IntrusiveCounterUnsigned : public IntrusiveCounter {
-public:
-    // virtuals from IntrusiveCounter
-    virtual void addRef() const;
-    virtual void release() const;
-
-    IntrusiveCounterUnsigned();
-
-private:
-    mutable unsigned counter;
-};
-
 /// This is an alternative base class to the above ones (will replace them eventually)
 class RefCountable {
     MONGO_DISALLOW_COPYING(RefCountable);
@@ -151,11 +103,4 @@ private:
     int _size;  // does NOT include trailing NUL byte.
     // char[_size+1] array allocated past end of class
 };
-};
-
-/* ======================= INLINED IMPLEMENTATIONS ========================== */
-
-namespace mongo {
-
-inline IntrusiveCounterUnsigned::IntrusiveCounterUnsigned() : counter(0) {}
-};
+}  // namespace mongo
-- 
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