File indexing completed on 2024-05-12 16:59:21

 /*
  *   SPDX-FileCopyrightText: 2015-2016 Ivan Cukic <ivan.cukic@kde.org>
  *
  *   SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
  */
 
 #ifndef UTILS_OPTIONAL_VIEW_H
 #define UTILS_OPTIONAL_VIEW_H
 
 namespace kamd
 {
 namespace utils
 {
 struct none_t {
 };
 inline const none_t none()
 {
     return none_t();
 }
 
 // A simple implementation of the optional class
 // until we can rely on std::optional.
 // It is not going to come close in the supported
 // features to the std one.
 // (we need it in the core library, so we don't
 // want to use boost.optional)
 template<typename T>
 class optional_view
 {
 public:
     explicit optional_view(const T &value)
         : m_value(&value)
     {
     }
 
     optional_view(const none_t &)
         : m_value(nullptr)
     {
     }
 
     bool is_initialized() const
     {
         return m_value != nullptr;
     }
 
     const T &get() const
     {
         return *m_value;
     }
 
     const T *operator->() const
     {
         return m_value;
     }
 
 private:
     const T *const m_value;
 };
 
 template<typename T>
 optional_view<T> make_optional_view(const T &value)
 {
     return optional_view<T>(value);
 }
 
 } // namespace utils
 } // namespace kamd
 
 #endif // UTILS_OPTIONAL_VIEW_H