noview.h (flens/auxiliary/noview.h)

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/*
*   Copyright (c) 2012, Michael Lehn
*
*   All rights reserved.
*
*   Redistribution and use in source and binary forms, with or without
*   modification, are permitted provided that the following conditions
*   are met:
*
*   1) Redistributions of source code must retain the above copyright
*      notice, this list of conditions and the following disclaimer.
*   2) 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.
*   3) Neither the name of the FLENS development group 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 THE COPYRIGHT
*   OWNER OR CONTRIBUTORS 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.
*/

#ifndef FLENS_AUXILIARY_NOVIEW_H
#define FLENS_AUXILIARY_NOVIEW_H 1

#include <flens/auxiliary/isconvertible.h>
#include <flens/matrixtypes/symmetric/symmetricmatrix.h>

namespace flens {

template <typename T, bool hasNoView>
struct NoViewSelect
{
    typedef T   Type;
};

template <typename T>
struct NoViewSelect<T, true>
{
    typedef typename T::NoView   Type;
};

template <typename T>
struct NoView
{

    struct Two
    {
        char x;
        char y;
    };

    template <typename A>
        static Two
        check(typename A::NoView *);

    template <typename Any>
        static char
        check(...);

    static const bool hasNoView = sizeof(check<T>(0)) == sizeof(Two);

    typedef typename NoViewSelect<T, hasNoView>::Type  Type;
};

} // namespace flens

#endif // FLENS_AUXILIARY_NOVIEW_H