73 lines
2.6 KiB
C++
73 lines
2.6 KiB
C++
/**************************************************************************
|
|
*
|
|
* gslice_array.cpp -- Generalized array slice examples
|
|
*
|
|
* $Id: gslice_array.cpp 550991 2007-06-26 23:58:07Z sebor $
|
|
*
|
|
***************************************************************************
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed
|
|
* with this work for additional information regarding copyright
|
|
* ownership. The ASF licenses this file to you under the Apache
|
|
* License, Version 2.0 (the "License"); you may not use this file
|
|
* except in compliance with the License. You may obtain a copy of
|
|
* the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
|
|
* implied. See the License for the specific language governing
|
|
* permissions and limitations under the License.
|
|
*
|
|
* Copyright 1994-2006 Rogue Wave Software.
|
|
*
|
|
**************************************************************************/
|
|
|
|
#include <iostream> // for cout, endl
|
|
#include <valarray.h> // Includes valarray and provides stream inserter.
|
|
#include <examples.h> // Generic header for all examples.
|
|
|
|
typedef std::valarray<int> valarray_t;
|
|
|
|
int main(void) {
|
|
|
|
valarray_t::value_type
|
|
ibuf[22] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
|
|
11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21 };
|
|
|
|
// Create a valarray of ints
|
|
valarray_t vi (ibuf,(sizeof ibuf / sizeof *ibuf));
|
|
|
|
// Print out the valarray
|
|
std::cout << "original valarray vi:\n\n" << vi << "\n\n";
|
|
|
|
// Get a two dimensional diagonal slice out of the middle
|
|
std::size_t length_ary[] = {4, 2};
|
|
std::size_t stride_ary[] = {4, 6};
|
|
|
|
std::valarray<std::size_t> length_val(length_ary, 2);
|
|
std::valarray<std::size_t> stride_val(stride_ary, 2);
|
|
|
|
|
|
// Print out the slices starting at positions 0 and 2 and respectively.
|
|
std::cout << "vi[gslice(0,[4,2],[4,6])]\n\n"
|
|
<< vi[std::gslice(0,length_val,stride_val)] << "\n\n";
|
|
|
|
std::cout << "vi[gslice(2,[4,2],[4,6])]\n\n"
|
|
<< vi[std::gslice(2,length_val,stride_val)] << "\n\n";
|
|
|
|
// Multiply the first slice by the second.
|
|
vi[std::gslice(0,length_val,stride_val)]
|
|
*= static_cast<valarray_t > (vi[std::gslice(2,length_val,stride_val)]);
|
|
|
|
std::cout << "vi[gslice(0,[4,2],[4,8])] *= vi[gslice(2,[4,2],[4,6])]\n\n"
|
|
<< vi << std::endl;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|