cafDataFieldAccessor.h

//##################################################################################################
//
//   Caffa
//   Copyright (C) Gaute Lindkvist
//
//   GNU Lesser General Public License Usage
//   This library is free software; you can redistribute it and/or modify
//   it under the terms of the GNU Lesser General Public License as published by
//   the Free Software Foundation; either version 2.1 of the License, or
//   (at your option) any later version.
//
//   This library is distributed in the hope that it will be useful, but WITHOUT ANY
//   WARRANTY; without even the implied warranty of MERCHANTABILITY or
//   FITNESS FOR A PARTICULAR PURPOSE.
//
//   See the GNU Lesser General Public License at <<http://www.gnu.org/licenses/lgpl-2.1.html>>
//   for more details.
//
#pragma once
 
#include <memory>
#include <optional>
 
namespace caffa
{
class DataFieldAccessorInterface
{
public:
    virtual ~DataFieldAccessorInterface() = default;
};
 
template <class DataType>
class DataFieldAccessor : public DataFieldAccessorInterface
{
public:
    virtual std::unique_ptr<DataFieldAccessor<DataType>> clone() const = 0;
 
    virtual DataType value() = 0;
 
    virtual void setValue( const DataType& value ) = 0;
};
 
template <class DataType>
class DataFieldDirectStorageAccessor : public DataFieldAccessor<DataType>
{
public:
    DataFieldDirectStorageAccessor() = default;
 
    DataFieldDirectStorageAccessor( const DataType& value )
        : m_value( value )
 
    {
    }
 
    std::unique_ptr<DataFieldAccessor<DataType>> clone() const override
    {
        return std::make_unique<DataFieldDirectStorageAccessor<DataType>>( m_value );
    }
 
    DataType value() override { return m_value; };
 
    void setValue( const DataType& value ) override { m_value = value; }
 
private:
    DataType m_value;
};
 
} // namespace caffa