[dali_2.1.6] Merge branch 'devel/master'

[platform/core/uifw/dali-toolkit.git] / dali-toolkit / internal / builder / optional-value.h

diff --git a/dali-toolkit/internal/builder/optional-value.h b/dali-toolkit/internal/builder/optional-value.h
index 51421ac..7a1d9f4 100644 (file)
--- a/dali-toolkit/internal/builder/optional-value.h
+++ b/dali-toolkit/internal/builder/optional-value.h
@@ -1,92 +1,130 @@
-#ifndef __DALI_TOOLKIT_INTERNAL_BUILDER_OPTIONAL__
-#define __DALI_TOOLKIT_INTERNAL_BUILDER_OPTIONAL__
+#ifndef DALI_TOOLKIT_INTERNAL_BUILDER_OPTIONAL_H
+#define DALI_TOOLKIT_INTERNAL_BUILDER_OPTIONAL_H
 
-//
-// Copyright (c) 2014 Samsung Electronics Co., Ltd.
-//
-// Licensed under the Flora License, Version 1.0 (the License);
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://floralicense.org/license/
-//
-// 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.
-//
+/*
+ * Copyright (c) 2021 Samsung Electronics Co., Ltd.
+ *
+ * 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.
+ *
+ */
 
-// INTERNAL INCLUDES
-template <typename T>
+template<typename T>
 struct OptionalTypes
 {
-  typedef T ValueType;
-  typedef const T& ReturnType;
-  static ReturnType Get(const ValueType& v) { return v; }
-  static ValueType Set(const ReturnType v) { return v; }
-  static bool Ok(const ValueType v) { return true; }
+  typedef T         ValueType;
+  typedef const T&  ReturnType;
+  static ReturnType Get(const ValueType& v)
+  {
+    return v;
+  }
+  static ValueType Set(const ReturnType v)
+  {
+    return v;
+  }
+  static bool Ok(const ValueType& v)
+  {
+    return true;
+  }
 };
 
-template <typename T>
+template<typename T>
 struct OptionalTypes<T*>
 {
-  typedef T* ValueType;
-  typedef const T* ReturnType;
-  static ReturnType Get(const ValueType v) { return v; }
-  static ValueType Set(const ReturnType v) { return v; }
-  static bool Ok(const ReturnType v) { return NULL != v; }
+  typedef T*        ValueType;
+  typedef const T*  ReturnType;
+  static ReturnType Get(const ValueType v)
+  {
+    return v;
+  }
+  static ValueType Set(const ReturnType v)
+  {
+    return v;
+  }
+  static bool Ok(const ReturnType v)
+  {
+    return NULL != v;
+  }
 };
 
-template <typename T>
+template<typename T>
 struct OptionalTypes<T&>
 {
-  typedef T* ValueType;
-  typedef const T& ReturnType;
-  static ReturnType Get(const ValueType v) { return *v; }
-  static ValueType Set(const ReturnType v) { return &v; }
-  static bool Ok(const ReturnType v) { return true; }
+  typedef T*        ValueType;
+  typedef const T&  ReturnType;
+  static ReturnType Get(const ValueType v)
+  {
+    return *v;
+  }
+  static ValueType Set(const ReturnType v)
+  {
+    return &v;
+  }
+  static bool Ok(const ReturnType v)
+  {
+    return true;
+  }
 };
 
-template <typename T>
+template<typename T>
 class OptionalValue
 {
 public:
-  typedef void ( OptionalValue::*bool_type )() const;
   typedef typename OptionalTypes<T>::ReturnType ReturnType;
-  typedef typename OptionalTypes<T>::ValueType ValueType;
+  typedef typename OptionalTypes<T>::ValueType  ValueType;
 
-  OptionalValue(): mOk(false), mValue() {}
-  OptionalValue( T value ): mOk(OptionalTypes<T>::Ok(value)), mValue(OptionalTypes<T>::Set(value)) {}
-  OptionalValue( bool b, T value ): mOk(b), mValue(OptionalTypes<T>::Set(value)) {}
-
-  ReturnType operator *() const { return OptionalTypes<T>::Get(mValue); }
-
-  // safe bool idiom
-  operator bool_type() const {
-    return mOk == true ? &OptionalValue::this_type_does_not_support_comparisons : 0;
+  OptionalValue()
+  : mOk(false),
+    mValue()
+  {
+  }
+  OptionalValue(T value)
+  : mOk(OptionalTypes<T>::Ok(value)),
+    mValue(OptionalTypes<T>::Set(value))
+  {
+  }
+  OptionalValue(bool b, T value)
+  : mOk(b),
+    mValue(OptionalTypes<T>::Set(value))
+  {
   }
 
-  template <typename OT>
-  bool operator!=( const OT& rhs )
+  ReturnType operator*() const
   {
-    this->this_type_does_not_support_comparisons();
-    return false;
+    return OptionalTypes<T>::Get(mValue);
   }
 
-  template <typename OT>
-  bool operator==( const OT& rhs )
+  explicit operator bool() const
   {
-    this->this_type_does_not_support_comparisons();
-    return false;
+    return mOk;
   }
 
 private:
-  bool mOk;
+  bool      mOk;
   ValueType mValue;
-  void this_type_does_not_support_comparisons() const {}
-  // todo operator=() ? use OptionalTypes<T>::Ok(mValue)
 };
 
+template<typename T, typename U>
+bool operator==(const OptionalValue<T>& lhs, const OptionalValue<U>& rhs)
+{
+  lhs.this_type_does_not_support_comparisons();
+  return false;
+}
+
+template<typename T, typename U>
+bool operator!=(const OptionalValue<T>& lhs, const OptionalValue<U>& rhs)
+{
+  lhs.this_type_does_not_support_comparisons();
+  return false;
+}
 
-#endif // header
+#endif // DALI_TOOLKIT_INTERNAL_BUILDER_OPTIONAL_H