product.h

数值计算工具库,C语言编写的,可以直接调用.

/***************************************************************************
 * blitz/meta/product.h  TinyVector product metaprogram
 *
 * $Id: product.h,v 1.2 1998/03/14 00:08:44 tveldhui Exp $
 *
 * Copyright (C) 1997,1998 Todd Veldhuizen <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Suggestions:          [e-mail]
 * Bugs:                 [e-mail]
 *
 * For more information, please see the Blitz++ Home Page:
 *    http://seurat.uwaterloo.ca/blitz/
 *
 ***************************************************************************
 * $Log: product.h,v $
 * Revision 1.2  1998/03/14 00:08:44  tveldhui
 * 0.2-alpha-05
 *
 * Revision 1.1  1997/07/16 14:51:20  tveldhui
 * Update: Alpha release 0.2 (Arrays)
 *
 */

#ifndef BZ_META_PRODUCT_H
#define BZ_META_PRODUCT_H

#ifndef BZ_PROMOTE_H
 #include <blitz/promote.h>
#endif

#ifndef BZ_METAPROG_H
 #include <blitz/meta/metaprog.h>
#endif

BZ_NAMESPACE(blitz)

template<int N, int I>
class _bz_meta_vectorProduct {
public:
    enum { loopFlag = (I < N-1) ? 1 : 0 };

    template<class T_expr1>
    static inline BZ_SUMTYPE(_bz_typename T_expr1::T_numtype)
    f(const T_expr1& a)
    {
        return a[I] * _bz_meta_vectorProduct<loopFlag * N, 
            loopFlag * (I+1)>::f(a);
    }
};

template<>
class _bz_meta_vectorProduct<0,0> {
public:
    template<class T_expr1>
    static inline _bz_meta_nullOperand f(const T_expr1&)
    { return _bz_meta_nullOperand(); }
};

BZ_NAMESPACE_END

#endif // BZ_META_PRODUCT_H