// ==========================================================================
//                 SeqAn - The Library for Sequence Analysis
// ==========================================================================
// Copyright (c) 2006-2016, 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"
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//
// ==========================================================================
// Author: Andreas Gogol-Doering <andreas.doering@mdc-berlin.de>
// Author: Manuel Holtgrewe <manuel.holtgrewe@fu-berlin.de>
// ==========================================================================

#ifndef SEQAN_INCLUDE_SEQAN_ALIGN_GAPPED_VALUE_TYPE_H_
#define SEQAN_INCLUDE_SEQAN_ALIGN_GAPPED_VALUE_TYPE_H_

namespace seqan {

// ============================================================================
// Forwards
// ============================================================================

// ============================================================================
// Tags, Classes, Enums
// ============================================================================

// ============================================================================
// Metafunctions
// ============================================================================

/*!
 * @mfn GappedValueType
 * @headerfile <seqan/align.h>
 * @brief Returns a value type that contains a black value <tt>'-'</tt>.
 *
 * @signature GappedValueType<T>::Type
 *
 * @tparam T The value type that should be expanded (if needed) by '-'.
 *
 * @return Type A type that can store the values of <tt>T</tt> and the value <tt>'-'</tt>.
 */

// TODO(holtgrew): Would it be enough to define it for Nothing instead of having a default implementation.

// We need a default implementation since we need it for Nothing.
template <typename T>
struct GappedValueType
{
    typedef T Type;
};

template <typename TValue, typename TSpec>
struct GappedValueType<SimpleType<TValue, TSpec> >
{
    typedef SimpleType<TValue, TSpec> THost_;
    typedef ModifiedAlphabet<THost_, ModExpand<'-'> > Type;
};

// ============================================================================
// Functions
// ============================================================================

}  // namespace seqan

#endif  // #ifndef SEQAN_INCLUDE_SEQAN_ALIGN_GAPPED_VALUE_TYPE_H_
