FieldType.h

//
// Copyright 2019 - 2024 (C). Alex Robenko. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
#pragma once
 
#include <type_traits>
#include <utility>
 
#include "comms/cast.h"
#include "comms/util/ScopeGuard.h"
 
namespace comms
{
 
namespace field
{
 
namespace adapter
{
 
 
template <typename TActField, typename TBase>
class FieldType : public TBase
{
    using BaseImpl = TBase;
public:
    using ValueType = typename BaseImpl::ValueType;
 
    bool valid() const
    {
        if (m_entered) {
            return BaseImpl::valid();
        }
 
        m_entered = true;
        auto onExit =
            comms::util::makeScopeGuard(
                [this]()
                {
                    m_entered = false;
                });
                
        return static_cast<const TActField*>(this)->valid();
    }
 
private:
    mutable bool m_entered = false;    
};
 
}  // namespace adapter
 
}  // namespace field
 
}  // namespace comms