Diff: zxing_lib/zxing/common/Counted.h

Revision:

0:eb73febb2bba

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/zxing_lib/zxing/common/Counted.h	Thu Oct 06 18:00:30 2016 +0900
@@ -0,0 +1,140 @@
+// -*- mode:c++; tab-width:2; indent-tabs-mode:nil; c-basic-offset:2 -*-
+#ifndef __COUNTED_H__
+#define __COUNTED_H__
+
+/*
+ *  Copyright 2010 ZXing authors All rights reserved.
+ *
+ * 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.
+ */
+
+#include <iostream>
+
+namespace zxing {
+
+/* base class for reference-counted objects */
+class Counted {
+private:
+  unsigned int count_;
+public:
+  Counted() :
+      count_(0) {
+  }
+  virtual ~Counted() {
+  }
+  Counted *retain() {
+    count_++;
+    return this;
+  }
+  void release() {
+    count_--;
+    if (count_ == 0) {
+      count_ = 0xDEADF001;
+      delete this;
+    }
+  }
+
+
+  /* return the current count for denugging purposes or similar */
+  int count() const {
+    return count_;
+  }
+};
+
+/* counting reference to reference-counted objects */
+template<typename T> class Ref {
+private:
+public:
+  T *object_;
+  explicit Ref(T *o = 0) :
+      object_(0) {
+    reset(o);
+  }
+  Ref(const Ref &other) :
+      object_(0) {
+    reset(other.object_);
+  }
+
+  template<class Y>
+  Ref(const Ref<Y> &other) :
+      object_(0) {
+    reset(other.object_);
+  }
+
+  ~Ref() {
+    if (object_) {
+      object_->release();
+    }
+  }
+
+  void reset(T *o) {
+    if (o) {
+      o->retain();
+    }
+    if (object_ != 0) {
+      object_->release();
+    }
+    object_ = o;
+  }
+  Ref& operator=(const Ref &other) {
+    reset(other.object_);
+    return *this;
+  }
+  template<class Y>
+  Ref& operator=(const Ref<Y> &other) {
+    reset(other.object_);
+    return *this;
+  }
+  Ref& operator=(T* o) {
+    reset(o);
+    return *this;
+  }
+  template<class Y>
+  Ref& operator=(Y* o) {
+    reset(o);
+    return *this;
+  }
+
+  T& operator*() {
+    return *object_;
+  }
+  T* operator->() const {
+    return object_;
+  }
+  operator T*() const {
+    return object_;
+  }
+
+  bool operator==(const T* that) {
+    return object_ == that;
+  }
+  bool operator==(const Ref &other) const {
+    return object_ == other.object_ || *object_ == *(other.object_);
+  }
+  template<class Y>
+  bool operator==(const Ref<Y> &other) const {
+    return object_ == other.object_ || *object_ == *(other.object_);
+  }
+
+  bool operator!=(const T* that) {
+    return !(*this == that);
+  }
+
+  bool empty() const {
+    return object_ == 0;
+  }
+};
+
+}
+
+#endif // __COUNTED_H__