61 lines
2.2 KiB
C++
61 lines
2.2 KiB
C++
/**************************************************************************
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*
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* indirect_array.cpp -- Indirect array examples
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*
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* $Id: indirect_array.cpp 550991 2007-06-26 23:58:07Z sebor $
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*
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***************************************************************************
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*
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* Copyright 1994-2006 Rogue Wave Software.
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*
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**************************************************************************/
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#include <iostream> // for cout, endl
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#include <valarray.h> // Includes valarray and provides stream inserter.
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#include <examples.h> // Generic header for all examples.
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typedef std::valarray<int> valarray_t;
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typedef std::valarray<std::size_t> selector_t;
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int main(void) {
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// Create a valarray of integers.
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valarray_t::value_type vbuf[10] = {0,1,2,3,4,5,6,7,8,9};
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valarray_t vi(vbuf, (sizeof vbuf / sizeof *vbuf));
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// Create a valarray of indices for a selector.
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selector_t::value_type sbuf[6] = {0,2,3,4,7,8};
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selector_t selector(sbuf, (sizeof sbuf / sizeof *sbuf));
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// Print out the valarray<int>.
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std::cout << "original valarray vi\n\n" << vi << "\n\n";
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// Print out the selective array.
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std::cout << "vi[0,2,3,4,7,8]\n\n" << vi[selector] << "\n\n";
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// Double the selected values.
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vi[selector] += vi[selector];
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// Print out the modified valarray.
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std::cout << "vi[0,2,3,4,7,8] += vi[0,2,3,4,7,8]\n\n" << vi << std::endl;
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return 0;
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}
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