| 1 | /*************************************************************************** |
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| 2 | * blitz/randref.h Random number generators, expression templates |
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| 3 | * wrapper |
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| 4 | * |
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| 5 | * $Id: randref.h,v 1.5 2003/12/11 03:44:22 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_RANDREF_H |
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| 28 | #define BZ_RANDREF_H |
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| 29 | |
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| 30 | #ifndef BZ_RANDOM_H |
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| 31 | #error <blitz/randref.h> must be included via <blitz/random.h> |
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| 32 | #endif // BZ_RANDOM_H |
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| 33 | |
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| 34 | BZ_NAMESPACE(blitz) |
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| 35 | |
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| 36 | template<typename P_distribution> |
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| 37 | class _bz_VecExprRandom { |
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| 38 | |
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| 39 | public: |
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| 40 | typedef _bz_typename Random<P_distribution>::T_numtype T_numtype; |
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| 41 | |
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| 42 | _bz_VecExprRandom(Random<P_distribution>& random) |
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| 43 | : random_(random) |
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| 44 | { } |
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| 45 | |
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| 46 | #ifdef BZ_MANUAL_VECEXPR_COPY_CONSTRUCTOR |
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| 47 | _bz_VecExprRandom(_bz_VecExprRandom<P_distribution>& x) |
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| 48 | : random_(x.random_) |
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| 49 | { } |
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| 50 | #endif |
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| 51 | |
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| 52 | T_numtype operator[](unsigned) const |
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| 53 | { return random_.random(); } |
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| 54 | |
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| 55 | T_numtype operator()(unsigned) const |
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| 56 | { return random_.random(); } |
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| 57 | |
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| 58 | unsigned length(unsigned recommendedLength) const |
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| 59 | { return recommendedLength; } |
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| 60 | |
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| 61 | unsigned _bz_suggestLength() const |
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| 62 | { return 0; } |
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| 63 | |
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| 64 | bool _bz_hasFastAccess() const |
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| 65 | { return 1; } |
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| 66 | |
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| 67 | T_numtype _bz_fastAccess(unsigned) const |
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| 68 | { return random_.random(); } |
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| 69 | |
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| 70 | private: |
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| 71 | _bz_VecExprRandom() : random_( Random<P_distribution>() ) { } |
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| 72 | |
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| 73 | Random<P_distribution>& random_; |
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| 74 | }; |
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| 75 | |
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| 76 | BZ_NAMESPACE_END |
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| 77 | |
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| 78 | #endif // BZ_RANDREF_H |
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| 79 | |
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