| 1 | // -*- C++ -*- |
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| 2 | /*************************************************************************** |
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| 3 | * blitz/meta/product.h TinyVector product metaprogram |
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| 4 | * |
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| 5 | * $Id: product.h,v 1.5 2005/05/07 04:17:57 julianc Exp $ |
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| 6 | * |
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| 7 | * Copyright (C) 1997-2001 Todd Veldhuizen <tveldhui@oonumerics.org> |
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| 8 | * |
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| 9 | * This program is free software; you can redistribute it and/or |
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| 10 | * modify it under the terms of the GNU General Public License |
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| 11 | * as published by the Free Software Foundation; either version 2 |
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| 12 | * of the License, or (at your option) any later version. |
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| 13 | * |
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| 14 | * This program is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * Suggestions: blitz-dev@oonumerics.org |
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| 20 | * Bugs: blitz-bugs@oonumerics.org |
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| 21 | * |
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| 22 | * For more information, please see the Blitz++ Home Page: |
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| 23 | * http://oonumerics.org/blitz/ |
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| 24 | * |
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| 25 | ***************************************************************************/ |
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| 26 | |
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| 27 | #ifndef BZ_META_PRODUCT_H |
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| 28 | #define BZ_META_PRODUCT_H |
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| 29 | |
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| 30 | #ifndef BZ_PROMOTE_H |
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| 31 | #include <blitz/promote.h> |
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| 32 | #endif |
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| 33 | |
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| 34 | #ifndef BZ_METAPROG_H |
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| 35 | #include <blitz/meta/metaprog.h> |
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| 36 | #endif |
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| 37 | |
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| 38 | BZ_NAMESPACE(blitz) |
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| 39 | |
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| 40 | template<int N, int I> |
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| 41 | class _bz_meta_vectorProduct { |
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| 42 | public: |
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| 43 | static const int loopFlag = (I < N-1) ? 1 : 0; |
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| 44 | |
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| 45 | template<typename T_expr1> |
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| 46 | static inline BZ_SUMTYPE(_bz_typename T_expr1::T_numtype) |
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| 47 | f(const T_expr1& a) |
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| 48 | { |
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| 49 | return a[I] * _bz_meta_vectorProduct<loopFlag * N, |
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| 50 | loopFlag * (I+1)>::f(a); |
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| 51 | } |
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| 52 | }; |
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| 53 | |
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| 54 | template<> |
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| 55 | class _bz_meta_vectorProduct<0,0> { |
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| 56 | public: |
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| 57 | template<typename T_expr1> |
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| 58 | static inline _bz_meta_nullOperand f(const T_expr1&) |
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| 59 | { return _bz_meta_nullOperand(); } |
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| 60 | }; |
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| 61 | |
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| 62 | BZ_NAMESPACE_END |
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| 63 | |
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| 64 | #endif // BZ_META_PRODUCT_H |
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