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// ==========================================================================
// SeqAn - The Library for Sequence Analysis
// ==========================================================================
// Copyright (c) 2006-2026, Knut Reinert, FU Berlin
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of Knut Reinert or the FU Berlin nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL KNUT REINERT OR THE FU BERLIN BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
// DAMAGE.
//
// ==========================================================================
// Author: Rene Rahn <rene.rahn@fu-berlin.de>
// ==========================================================================
#ifndef INCLUDE_SEQAN_JOURNALED_STRING_TREE_STACK_OBSERVER_H_
#define INCLUDE_SEQAN_JOURNALED_STRING_TREE_STACK_OBSERVER_H_
namespace seqan2
{
// ============================================================================
// Forwards
// ============================================================================
template <typename TObject>
struct ObservedValue
{
using Type = Nothing;
};
// ============================================================================
// Tags, Classes, Enums
// ============================================================================
// ----------------------------------------------------------------------------
// Tag PushEvent
// ----------------------------------------------------------------------------
struct PushEvent_;
typedef Tag<PushEvent_> PushEvent;
// ----------------------------------------------------------------------------
// Tag PopEvent
// ----------------------------------------------------------------------------
struct PopEvent_;
typedef Tag<PopEvent_> PopEvent;
// ----------------------------------------------------------------------------
// Class StackObserver
// ----------------------------------------------------------------------------
template <typename TObject>
class StackObserver
{
public:
using TValue = typename ObservedValue<TObject>::Type;
using TStack = String<TValue, Block<> >;
TObject & _obj;
TStack _data;
StackObserver(TObject & obj) : _obj(obj)
{}
};
// ============================================================================
// Metafunctions
// ============================================================================
// ============================================================================
// Functions
// ============================================================================
// ----------------------------------------------------------------------------
// Function notify(); PushEvent
// ----------------------------------------------------------------------------
template <typename TObject>
inline void
notify(StackObserver<TObject> & me,
PushEvent const & /*tag*/)
{
appendValue(me._data, getObservedValue(me._obj));
}
// ----------------------------------------------------------------------------
// Function notify(); PopEvent
// ----------------------------------------------------------------------------
template <typename TObject>
inline void
notify(StackObserver<TObject> & me,
PopEvent const & /*tag*/)
{
setObservedValue(me._obj, std::move(back(me._data)));
eraseBack(me._data);
}
}
#endif // #ifndef INCLUDE_SEQAN_JOURNALED_STRING_TREE_STACK_OBSERVER_H_
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