/* * $Id: vecnorm.cc,v 1.3 2003/12/11 03:44:22 julianc Exp $ * * Copyright (C) 1997 Todd Veldhuizen <tveldhui@oonumerics.org> * All rights reserved.  Please see <blitz/blitz.h> for terms and * conditions of use. * */#ifndef BZ_VECNORM_CC#define BZ_VECNORM_CC#ifndef BZ_VECGLOBS_H #error <blitz/vecnorm.cc> must be included via <blitz/vecglobs.h>#endifBZ_NAMESPACE(blitz)template<typename P_expr>inlineBZ_FLOATTYPE(BZ_SUMTYPE(_bz_typename P_expr::T_numtype))_bz_vec_norm(P_expr vector){    // An extreme use of traits here.  It's necessary to    // handle odd cases such as the norm of a Vector<char>.    // To avoid overflow, BZ_SUMTYPE(char) is int.    // To take the sqrt of the sum, BZ_FLOATTYPE(char) is float.    // So float is returned for Vector<char>.    typedef _bz_typename P_expr::T_numtype T_numtype;    typedef BZ_SUMTYPE(T_numtype)          T_sumtype;    typedef BZ_FLOATTYPE(T_sumtype)        T_floattype;    T_sumtype sum = 0;    int length = vector._bz_suggestLength();    if (vector._bz_hasFastAccess())    {        for (int i=0; i < length; ++i)        {            T_numtype value = vector._bz_fastAccess(i);            sum += value * T_sumtype(value);        }    }    else {        for (int i=0; i < length; ++i)        {            T_numtype value = vector(i);            sum += value * T_sumtype(value);        }    }    return _bz_sqrt<T_floattype>::apply(sum);}template<typename P_numtype>inlineBZ_FLOATTYPE(BZ_SUMTYPE(P_numtype)) norm(const Vector<P_numtype>& x){    return _bz_vec_norm(x._bz_asVecExpr());}// norm(expr)template<typename P_expr>inlineBZ_FLOATTYPE(BZ_SUMTYPE(_bz_typename P_expr::T_numtype))norm(_bz_VecExpr<P_expr> expr){    return _bz_vec_norm(expr);}// norm(vecpick)template<typename P_numtype>inlineBZ_FLOATTYPE(BZ_SUMTYPE(P_numtype))norm(const VectorPick<P_numtype>& x){    return _bz_vec_norm(x._bz_asVecExpr());}// norm(TinyVector)template<typename P_numtype, int N_dimensions>inlineBZ_FLOATTYPE(BZ_SUMTYPE(P_numtype))norm(const TinyVector<P_numtype, N_dimensions>& x){    return _bz_vec_norm(x._bz_asVecExpr());}BZ_NAMESPACE_END#endif // BZ_VECNORM_CC