minus.tcc (flens/scalaroperations/minus.tcc)

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/*
*   Copyright (c) 2010, 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_SCALAROPERATIONS_MINUS_TCC
#define FLENS_SCALAROPERATIONS_MINUS_TCC 1

#include <flens/scalaroperations/minus.h>

namespace flens {

template <typename L, typename R>
const typename ScalarClosure<ScalarOpMinus, L, R>::ElementType
evalScalarClosure(const ScalarClosure<ScalarOpMinus, L, R> &exp)
{
    return exp.left().value() - exp.right().value();
}

template <typename L>
const typename ScalarClosure<ScalarOpUnaryMinus, L, L>::ElementType
evalScalarClosure(const ScalarClosure<ScalarOpUnaryMinus, L, L> &exp)
{
    return -exp.left().value();
}

//-- operator overloading
template <typename L, typename R>
const ScalarClosure<ScalarOpMinus,
                    typename L::Impl,
                    typename R::Impl>
operator-(const Scalar<L> &l, const Scalar<R> &r)
{
    typedef ScalarClosure<ScalarOpMinus, typename L::Impl, typename R::Impl> SC;
    return SC(l.impl(), r.impl());
}

template <typename ALPHA, typename R>
const typename
RestrictTo<CompatibleScalar<ALPHA, R>::value,
    ScalarClosure<ScalarOpMinus,
                  ScalarValue<ALPHA>,
                  typename R::Impl>
>::Type
operator-(const ALPHA &alpha, const Scalar<R> &r)
{
    typedef ScalarClosure<ScalarOpMinus,
                          ScalarValue<ALPHA>,
                          typename R::Impl>     SC;
    return SC(alpha, r.impl());
}

template <typename L, typename ALPHA>
const typename
RestrictTo<CompatibleScalar<ALPHA, L>::value,
    ScalarClosure<ScalarOpMinus,
                  typename L::Impl,
                  ScalarValue<ALPHA> >
>::Type
operator-(const Scalar<L> &l, const ALPHA &alpha)
{
    typedef ScalarClosure<ScalarOpMinus,
                          typename L::Impl,
                          ScalarValue<ALPHA> >  SC;
    return SC(l.impl(), alpha);
}

template <typename L>
const ScalarClosure<ScalarOpUnaryMinus,
                    typename L::Impl,
                    typename L::Impl>
operator-(const Scalar<L> &l)
{
    typedef ScalarClosure<ScalarOpUnaryMinus,
                          typename L::Impl,
                          typename L::Impl>     SC;
    return SC(l.impl(), l.impl());
}

} // namespace flens

#endif // FLENS_SCALAROPERATIONS_MINUS_TCC