Bug 916632 (insanity::pkix::ScopedPtr), Part 1: Add insanity::pkix::ScopedPtr, r=cviecco

--HG--
extra : rebase_source : 57180ed742a0ae16ea662ce2fdf1f79bad0f8dda
extra : source : e92633f954bcff92b47621337b3c8d8ad83ac543

security/insanity/include/insanity/ScopedPtr.h

@@ -0,0 +1,69 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* Copyright 2013 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef insanity_pkix__ScopedPtr_h
+#define insanity_pkix__ScopedPtr_h
+
+namespace insanity { namespace pkix {
+
+// Similar to boost::scoped_ptr and std::unique_ptr. Does not support copying
+// or assignment.
+template <typename T, void (*Destroyer)(T*)>
+class ScopedPtr
+{
+public:
+  explicit ScopedPtr(T* value = nullptr) : mValue(value) { }
+  ~ScopedPtr()
+  {
+    if (mValue) {
+      Destroyer(mValue);
+    }
+  }
+
+  void operator=(T* newValue)
+  {
+    if (mValue) {
+      Destroyer(mValue);
+    }
+    mValue = newValue;
+  }
+
+  T& operator*() const { return *mValue; }
+  T* operator->() const { return mValue; }
+  operator bool() const { return mValue; }
+
+  T* get() const { return mValue; }
+
+  T* release()
+  {
+    T* result = mValue;
+    mValue = nullptr;
+    return result;
+  }
+
+  void reset() { *this = nullptr; }
+
+protected:
+  T* mValue;
+
+  ScopedPtr(const ScopedPtr&) /* = delete */;
+  void operator=(const ScopedPtr&) /* = delete */;
+};
+
+} } // namespace insanity::pkix
+
+#endif // insanity_pkix__ScopedPtr_h