//
// Copyright (c) 2002--2010
// Toon Knapen, Karl Meerbergen, Kresimir Fresl,
// Thomas Klimpel and Rutger ter Borg
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// THIS FILE IS AUTOMATICALLY GENERATED
// PLEASE DO NOT EDIT!
//

#ifndef BOOST_NUMERIC_BINDINGS_LAPACK_AUXILIARY_LARFG_HPP
#define BOOST_NUMERIC_BINDINGS_LAPACK_AUXILIARY_LARFG_HPP

#include <boost/assert.hpp>
#include <boost/numeric/bindings/begin.hpp>
#include <boost/numeric/bindings/is_complex.hpp>
#include <boost/numeric/bindings/is_mutable.hpp>
#include <boost/numeric/bindings/is_real.hpp>
#include <boost/numeric/bindings/remove_imaginary.hpp>
#include <boost/numeric/bindings/size.hpp>
#include <boost/numeric/bindings/stride.hpp>
#include <boost/numeric/bindings/value_type.hpp>
#include <boost/static_assert.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/type_traits/remove_const.hpp>
#include <boost/utility/enable_if.hpp>

//
// The LAPACK-backend for larfg is the netlib-compatible backend.
//
#include <boost/numeric/bindings/lapack/detail/lapack.h>
#include <boost/numeric/bindings/lapack/detail/lapack_option.hpp>

namespace boost {
namespace numeric {
namespace bindings {
namespace lapack {

//
// The detail namespace contains value-type-overloaded functions that
// dispatch to the appropriate back-end LAPACK-routine.
//
namespace detail {

//
// Overloaded function for dispatching to
// * netlib-compatible LAPACK backend (the default), and
// * float value-type.
//
inline std::ptrdiff_t larfg( const fortran_int_t n, float& alpha, float* x,
        const fortran_int_t incx, float& tau ) {
    fortran_int_t info(0);
    LAPACK_SLARFG( &n, &alpha, x, &incx, &tau );
    return info;
}

//
// Overloaded function for dispatching to
// * netlib-compatible LAPACK backend (the default), and
// * double value-type.
//
inline std::ptrdiff_t larfg( const fortran_int_t n, double& alpha, double* x,
        const fortran_int_t incx, double& tau ) {
    fortran_int_t info(0);
    LAPACK_DLARFG( &n, &alpha, x, &incx, &tau );
    return info;
}

//
// Overloaded function for dispatching to
// * netlib-compatible LAPACK backend (the default), and
// * complex<float> value-type.
//
inline std::ptrdiff_t larfg( const fortran_int_t n, std::complex<float>& alpha,
        std::complex<float>* x, const fortran_int_t incx,
        std::complex<float>& tau ) {
    fortran_int_t info(0);
    LAPACK_CLARFG( &n, &alpha, x, &incx, &tau );
    return info;
}

//
// Overloaded function for dispatching to
// * netlib-compatible LAPACK backend (the default), and
// * complex<double> value-type.
//
inline std::ptrdiff_t larfg( const fortran_int_t n,
        std::complex<double>& alpha, std::complex<double>* x,
        const fortran_int_t incx, std::complex<double>& tau ) {
    fortran_int_t info(0);
    LAPACK_ZLARFG( &n, &alpha, x, &incx, &tau );
    return info;
}

} // namespace detail

//
// Value-type based template class. Use this class if you need a type
// for dispatching to larfg.
//
template< typename Value, typename Enable = void >
struct larfg_impl {};

//
// This implementation is enabled if Value is a real type.
//
template< typename Value >
struct larfg_impl< Value, typename boost::enable_if< is_real< Value > >::type > {

    typedef Value value_type;
    typedef typename remove_imaginary< Value >::type real_type;

    //
    // Static member function, that
    // * Deduces the required arguments for dispatching to LAPACK, and
    // * Asserts that most arguments make sense.
    //
    template< typename VectorX >
    static std::ptrdiff_t invoke( const fortran_int_t n, real_type& alpha,
            VectorX& x, real_type& tau ) {
        namespace bindings = ::boost::numeric::bindings;
        BOOST_STATIC_ASSERT( (bindings::is_mutable< VectorX >::value) );
        return detail::larfg( n, alpha, bindings::begin_value(x),
                bindings::stride(x), tau );
    }

};

//
// This implementation is enabled if Value is a complex type.
//
template< typename Value >
struct larfg_impl< Value, typename boost::enable_if< is_complex< Value > >::type > {

    typedef Value value_type;
    typedef typename remove_imaginary< Value >::type real_type;

    //
    // Static member function, that
    // * Deduces the required arguments for dispatching to LAPACK, and
    // * Asserts that most arguments make sense.
    //
    template< typename VectorX >
    static std::ptrdiff_t invoke( const fortran_int_t n, value_type& alpha,
            VectorX& x, value_type& tau ) {
        namespace bindings = ::boost::numeric::bindings;
        BOOST_STATIC_ASSERT( (bindings::is_mutable< VectorX >::value) );
        return detail::larfg( n, alpha, bindings::begin_value(x),
                bindings::stride(x), tau );
    }

};


//
// Functions for direct use. These functions are overloaded for temporaries,
// so that wrapped types can still be passed and used for write-access. In
// addition, if applicable, they are overloaded for user-defined workspaces.
// Calls to these functions are passed to the larfg_impl classes. In the 
// documentation, most overloads are collapsed to avoid a large number of
// prototypes which are very similar.
//

//
// Overloaded function for larfg. Its overload differs for
//
template< typename VectorX >
inline std::ptrdiff_t larfg( const fortran_int_t n,
        typename remove_imaginary< typename bindings::value_type<
        VectorX >::type >::type& alpha, VectorX& x, typename remove_imaginary<
        typename bindings::value_type< VectorX >::type >::type& tau ) {
    return larfg_impl< typename bindings::value_type<
            VectorX >::type >::invoke( n, alpha, x, tau );
}

//
// Overloaded function for larfg. Its overload differs for
//
template< typename VectorX >
inline std::ptrdiff_t larfg( const fortran_int_t n,
        typename bindings::value_type< VectorX >::type& alpha, VectorX& x,
        typename bindings::value_type< VectorX >::type& tau ) {
    return larfg_impl< typename bindings::value_type<
            VectorX >::type >::invoke( n, alpha, x, tau );
}

} // namespace lapack
} // namespace bindings
} // namespace numeric
} // namespace boost

#endif