| 1 | // -*- C++ -*- |
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| 2 | /*************************************************************************** |
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| 3 | * blitz/meta/sum.h TinyVector sum metaprogram |
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| 4 | * |
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| 5 | * $Id$ |
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| 6 | * |
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| 7 | * Copyright (C) 1997-2011 Todd Veldhuizen <tveldhui@acm.org> |
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| 8 | * |
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| 9 | * This file is a part of Blitz. |
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| 10 | * |
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| 11 | * Blitz is free software: you can redistribute it and/or modify |
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| 12 | * it under the terms of the GNU Lesser General Public License |
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| 13 | * as published by the Free Software Foundation, either version 3 |
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| 14 | * of the License, or (at your option) any later version. |
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| 15 | * |
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| 16 | * Blitz is distributed in the hope that it will be useful, |
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| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 19 | * GNU Lesser General Public License for more details. |
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| 20 | * |
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| 21 | * You should have received a copy of the GNU Lesser General Public |
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| 22 | * License along with Blitz. If not, see <http://www.gnu.org/licenses/>. |
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| 23 | * |
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| 24 | * Suggestions: blitz-devel@lists.sourceforge.net |
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| 25 | * Bugs: blitz-support@lists.sourceforge.net |
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| 26 | * |
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| 27 | * For more information, please see the Blitz++ Home Page: |
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| 28 | * https://sourceforge.net/projects/blitz/ |
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| 29 | * |
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| 30 | ***************************************************************************/ |
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| 31 | |
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| 32 | #ifndef BZ_META_SUM_H |
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| 33 | #define BZ_META_SUM_H |
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| 34 | |
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| 35 | #ifndef BZ_METAPROG_H |
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| 36 | #include <blitz/meta/metaprog.h> |
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| 37 | #endif |
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| 38 | |
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| 39 | BZ_NAMESPACE(blitz) |
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| 40 | |
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| 41 | template<int N, int I> |
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| 42 | class _bz_meta_vectorSum { |
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| 43 | public: |
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| 44 | static const int loopFlag = (I < N-1) ? 1 : 0; |
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| 45 | |
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| 46 | template<typename T_expr1> |
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| 47 | static inline BZ_SUMTYPE(_bz_typename T_expr1::T_numtype) |
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| 48 | f(const T_expr1& a) |
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| 49 | { |
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| 50 | return a[I] + |
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| 51 | _bz_meta_vectorSum<loopFlag * N, loopFlag * (I+1)>::f(a); |
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| 52 | } |
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| 53 | }; |
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| 54 | |
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| 55 | template<> |
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| 56 | class _bz_meta_vectorSum<0,0> { |
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| 57 | public: |
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| 58 | template<typename T_expr1> |
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| 59 | static inline _bz_meta_nullOperand f(const T_expr1&) |
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| 60 | { return _bz_meta_nullOperand(); } |
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| 61 | |
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| 62 | }; |
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| 63 | |
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| 64 | template<int N, int I, typename T_ret> |
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| 65 | class _bz_meta_vectorSumRet { |
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| 66 | public: |
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| 67 | static const int loopFlag = (I < N-1) ? 1 : 0; |
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| 68 | |
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| 69 | template<typename T_expr1> |
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| 70 | static inline T_ret |
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| 71 | f(const T_expr1& a) |
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| 72 | { |
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| 73 | return static_cast<T_ret>(a[I]) + |
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| 74 | _bz_meta_vectorSumRet<loopFlag * N, loopFlag * (I+1), T_ret>::f(a); |
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| 75 | } |
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| 76 | }; |
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| 77 | |
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| 78 | template<typename T_ret> |
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| 79 | class _bz_meta_vectorSumRet<0,0, T_ret> { |
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| 80 | public: |
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| 81 | template<typename T_expr1> |
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| 82 | static inline _bz_meta_nullOperand f(const T_expr1&) |
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| 83 | { return _bz_meta_nullOperand(); } |
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| 84 | |
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| 85 | }; |
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| 86 | |
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| 87 | BZ_NAMESPACE_END |
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| 88 | |
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| 89 | #endif // BZ_META_SUM_H |
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