-#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 void (OptionalValue::*bool_type)() const;
typedef typename OptionalTypes<T>::ReturnType ReturnType;
- 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); }
+ typedef typename OptionalTypes<T>::ValueType ValueType;
- // 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 )
+ // safe bool idiom
+ operator bool_type() const
{
- this->this_type_does_not_support_comparisons();
- return false;
+ return mOk == true ? &OptionalValue::this_type_does_not_support_comparisons : 0;
}
private:
- bool mOk;
+ bool mOk;
ValueType mValue;
- void this_type_does_not_support_comparisons() const {}
- // todo operator=() ? use OptionalTypes<T>::Ok(mValue)
+ void this_type_does_not_support_comparisons() const
+ {
+ }
};
+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