| 1 | /***************************************************************************
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| 2 | * blitz/vecwhere.h where(X,Y,Z) function for vectors
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| 3 | *
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| 4 | * $Id: vecwhere.h,v 1.1.1.1 1999-11-26 16:37:06 ansari Exp $
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| 5 | *
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| 6 | * Copyright (C) 1997,1998 Todd Veldhuizen <tveldhui@seurat.uwaterloo.ca>
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| 7 | *
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| 8 | * This program is free software; you can redistribute it and/or
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| 9 | * modify it under the terms of the GNU General Public License
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| 10 | * as published by the Free Software Foundation; either version 2
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| 11 | * of the License, or (at your option) any later version.
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| 12 | *
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| 13 | * This program is distributed in the hope that it will be useful,
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | * GNU General Public License for more details.
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| 17 | *
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| 18 | * Suggestions: blitz-suggest@cybervision.com
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| 19 | * Bugs: blitz-bugs@cybervision.com
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| 20 | *
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| 21 | * For more information, please see the Blitz++ Home Page:
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| 22 | * http://seurat.uwaterloo.ca/blitz/
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| 23 | *
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| 24 | ***************************************************************************
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| 25 | * $Log: not supported by cvs2svn $
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| 26 | * Revision 1.1.1.1 1999/04/09 17:59:00 ansari
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| 27 | * Creation module DPC/Blitz (blitz 0.4) Reza 09/04/99
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| 28 | *
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| 29 | * Revision 1.4 1998/03/14 00:04:47 tveldhui
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| 30 | * 0.2-alpha-05
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| 31 | *
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| 32 | * Revision 1.3 1997/07/16 14:51:20 tveldhui
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| 33 | * Update: Alpha release 0.2 (Arrays)
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| 34 | *
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| 35 | * Revision 1.2 1997/01/24 14:42:00 tveldhui
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| 36 | * Periodic RCS update
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| 37 | *
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| 38 | * Revision 1.1 1997/01/23 03:28:28 tveldhui
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| 39 | * Periodic RCS update
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| 40 | *
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| 41 | */
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| 42 |
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| 43 | #ifndef BZ_VECWHERE_H
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| 44 | #define BZ_VECWHERE_H
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| 45 |
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| 46 | #ifndef BZ_VECEXPR_H
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| 47 | #error <blitz/vecwhere.h> must be included via <blitz/vector.h>
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| 48 | #endif
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| 49 |
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| 50 | BZ_NAMESPACE(blitz)
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| 51 |
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| 52 | template<class P_expr1, class P_expr2, class P_expr3>
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| 53 | class _bz_VecWhere {
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| 54 |
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| 55 | public:
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| 56 | typedef P_expr1 T_expr1;
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| 57 | typedef P_expr2 T_expr2;
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| 58 | typedef P_expr3 T_expr3;
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| 59 | typedef _bz_typename T_expr2::T_numtype T_numtype2;
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| 60 | typedef _bz_typename T_expr3::T_numtype T_numtype3;
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| 61 | typedef BZ_PROMOTE(T_numtype2, T_numtype3) T_numtype;
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| 62 |
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| 63 | #ifdef BZ_PASS_EXPR_BY_VALUE
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| 64 | _bz_VecWhere(T_expr1 a, T_expr2 b, T_expr3 c)
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| 65 | : iter1_(a), iter2_(b), iter3_(c)
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| 66 | { }
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| 67 | #else
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| 68 | _bz_VecWhere(const T_expr1& a, const T_expr2& b, const T_expr3& c)
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| 69 | : iter1_(a), iter2_(b), iter3_(c)
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| 70 | { }
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| 71 | #endif
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| 72 |
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| 73 | #ifdef BZ_MANUAL_VECEXPR_COPY_CONSTRUCTOR
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| 74 | _bz_VecWhere(const _bz_VecWhere<T_expr1, T_expr2, T_expr3>& x)
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| 75 | : iter1_(x.iter1_), iter2_(x.iter2_), iter3_(x.iter3_)
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| 76 | { }
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| 77 | #endif
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| 78 |
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| 79 | T_numtype operator[](int i) const
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| 80 | {
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| 81 | return iter1_[i] ? iter2_[i] : iter3_[i];
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| 82 | }
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| 83 |
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| 84 | enum {
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| 85 | _bz_staticLengthCount =
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| 86 | P_expr1::_bz_staticLengthCount + P_expr2::_bz_staticLengthCount
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| 87 | + P_expr3::_bz_staticLengthCount,
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| 88 |
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| 89 | _bz_dynamicLengthCount =
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| 90 | P_expr1::_bz_dynamicLengthCount + P_expr2::_bz_dynamicLengthCount
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| 91 | + P_expr3::_bz_dynamicLengthCount,
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| 92 |
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| 93 | _bz_staticLength =
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| 94 | _bz_meta_max<_bz_meta_max<P_expr1::_bz_staticLength,
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| 95 | P_expr2::_bz_staticLength>::max, P_expr3::_bz_staticLength>::max
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| 96 | };
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| 97 |
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| 98 | T_numtype _bz_fastAccess(int i) const
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| 99 | {
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| 100 | return iter1_._bz_fastAccess(i)
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| 101 | ? iter2_._bz_fastAccess(i)
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| 102 | : iter3_._bz_fastAccess(i);
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| 103 | }
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| 104 |
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| 105 | _bz_bool _bz_hasFastAccess() const
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| 106 | {
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| 107 | return iter1_._bz_hasFastAccess() &&
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| 108 | iter2_._bz_hasFastAccess() &&
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| 109 | iter3_._bz_hasFastAccess();
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| 110 | }
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| 111 |
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| 112 | int length(int recommendedLength) const
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| 113 | {
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| 114 | return iter1_.length(recommendedLength);
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| 115 | }
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| 116 |
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| 117 | int _bz_suggestLength() const
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| 118 | {
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| 119 | BZPRECONDITION(
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| 120 | (iter1_._bz_suggestLength() == iter2_._bz_suggestLength())
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| 121 | && (iter2_._bz_suggestLength() == iter3_._bz_suggestLength()));
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| 122 |
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| 123 | return iter1_._bz_suggestLength();
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| 124 | }
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| 125 |
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| 126 | private:
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| 127 | _bz_VecWhere() { }
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| 128 |
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| 129 | T_expr1 iter1_;
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| 130 | T_expr2 iter2_;
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| 131 | T_expr3 iter3_;
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| 132 | };
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| 133 |
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| 134 | BZ_NAMESPACE_END
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| 135 |
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| 136 | #include <blitz/vecwhere.cc> // Expression templates
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| 137 |
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| 138 | #endif // BZ_VECWHERE_H
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| 139 |
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