memory.h

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/* 
* Copyright (C) 2020-2026 MEmilio
*
* Authors: Daniel Abele
*
* Contact: Martin J. Kuehn <Martin.Kuehn@DLR.de>
*
* 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 MEMORY_H
#define MEMORY_H
 
#include <utility>
 
namespace mio
{
 
template <typename T>
class observer_ptr
{
public:
    observer_ptr(T* p)
        : m_raw_ptr(p)
    {
    }
 
    observer_ptr(const observer_ptr& other) = default;
 
    void reset(T* p = nullptr)
    {
        m_raw_ptr = p;
    }
 
    T* get() const
    {
        return m_raw_ptr;
    }
 
    T* operator->() const
    {
        return m_raw_ptr;
    }
 
    T& operator*() const
    {
        return *m_raw_ptr;
    }
 
    operator bool() const
    {
        return m_raw_ptr != nullptr;
    }
 
    bool operator==(const observer_ptr& other) const
    {
        return m_raw_ptr == other.m_raw_ptr;
    }
    bool operator!=(const observer_ptr& other) const
    {
        return !(*this == other);
    }
 
private:
    T* m_raw_ptr;
};
 
template <typename T>
observer_ptr<T> make_observer(T* p)
{
    return observer_ptr<T>(p);
}
 
} // namespace mio
 
#endif // MEMORY_H