tri.tcc (flens/lapack/tp/tri.tcc)

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/*

 *   Copyright (c) 2012, Michael Lehn, Klaus Pototzky

 *

 *   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.

 */

/* Baesed on

 *

      SUBROUTINE DTPTRI( UPLO, DIAG, N, AP, INFO )

      SUBROUTINE ZTPTRI( UPLO, DIAG, N, AP, INFO )

 *

 *  -- LAPACK routine (version 3.2) --

 *  -- LAPACK is a software package provided by Univ. of Tennessee,    --

 *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--

 *     November 2006

 */

#ifndef FLENS_LAPACK_TP_TRI_TCC

#define FLENS_LAPACK_TP_TRI_TCC 1

#include <cxxstd/algorithm.h>

#include <flens/blas/blas.h>

#include <flens/lapack/lapack.h>

namespace flens { namespace lapack {

//== interface for native lapack ===============================================

#ifdef USE_CXXLAPACK

namespace external {

//-- (tp)tri [real and complex variant] ----------------------------------------

template <typename MA>

typename GeMatrix<MA>::IndexType

tri_impl(TpMatrix<MA> &A)

{

    typedef typename TpMatrix<MA>::IndexType  IndexType;

    IndexType info = cxxlapack::tptri<IndexType>(getF77Char(A.upLo()),

                                                 getF77Char(A.diag()),

                                                 A.dim(),

                                                 A.data());

    ASSERT(info>=0);

    return info;

}

} // namespace external

#endif // USE_CXXLAPACK

//== public interface ==========================================================

#ifdef USE_CXXLAPACK

//-- (tp)tri [real and complex variant] ----------------------------------------

template <typename MA>

typename RestrictTo<IsTpMatrix<MA>::value,

         typename RemoveRef<MA>::Type::IndexType>::Type

tri(MA &&A)

{

//

//  Remove references from rvalue types

//

    typedef typename RemoveRef<MA>::Type    MatrixA;

    typedef typename MatrixA::IndexType     IndexType;

//

//  Test the input parameters

//

#   ifndef NDEBUG

    ASSERT(A.firstRow()==1);

    ASSERT(A.firstCol()==1);

#   endif

//

//  Make copies of output arguments

//

#   ifdef CHECK_CXXLAPACK

    typename MatrixA::NoView   A_org = A;

#   endif

//

//  Call implementation

//

    const IndexType info = external::tri_impl(A);

    return info;

}

#endif // USE_CXXLAPACK

} } // namespace lapack, flens

#endif // FLENS_LAPACK_TP_TRI_TCC