BitMagic-C++
sample10.cpp
Go to the documentation of this file.
1/*
2Copyright(c) 2002-2017 Anatoliy Kuznetsov(anatoliy_kuznetsov at yahoo.com)
3
4Licensed under the Apache License, Version 2.0 (the "License");
5you may not use this file except in compliance with the License.
6You may obtain a copy of the License at
7
8 http://www.apache.org/licenses/LICENSE-2.0
9
10Unless required by applicable law or agreed to in writing, software
11distributed under the License is distributed on an "AS IS" BASIS,
12WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13See the License for the specific language governing permissions and
14limitations under the License.
15
16For more information please visit: http://bitmagic.io
17*/
18
19/** \example sample10.cpp
20 Example of how to get random subset of a bit-vector
21
22 \sa bm::random_subset
23 */
24
25/*! \file sample10.cpp
26 \brief Example: bvector<> generation of random sub-set
27*/
28
29
30#include <iostream>
31#include "bm.h"
32#include "bmrandom.h"
33
34using namespace std;
35
36template<class T> void PrintContainer(T first, T last)
37{
38 if (first == last)
39 cout << "<EMPTY SET>";
40 else
41 for(;first != last; ++first)
42 cout << *first << ";";
43 cout << endl;
44}
45
46
47int main(void)
48{
49 try
50 {
52 // -----------------------------------------------
53 // set some bits
54 //
56 for (i = 0; i < 30000; i+=10)
57 {
58 bv.set(i);
59 }
60
61 for (i = 300000; i < 400000; i+=100)
62 {
63 bv.set(i);
64 }
65
66 bm::bvector<> bvsubset1;
67 bm::bvector<> bvsubset2;
68
69 // random sampler instance can be shared between calls
70 //
72 rand_sampler.sample(bvsubset1, bv, 20);
73 rand_sampler.sample(bvsubset2, bv, 20);
74
75 PrintContainer(bvsubset1.first(), bvsubset1.end());
76 cout << endl;
77 PrintContainer(bvsubset2.first(), bvsubset2.end());
78 }
79 catch(std::exception& ex)
80 {
81 std::cerr << ex.what() << std::endl;
82 return 1;
83 }
84
85 return 0;
86}
87
Compressed bit-vector bvector<> container, set algebraic methods, traversal iterators.
Generation of random subset.
bvector< Alloc > & set(size_type n, bool val=true)
Sets bit n if val is true, clears bit n if val is false.
Definition bm.h:3581
enumerator first() const
Returns enumerator pointing on the first non-zero bit.
Definition bm.h:1770
enumerator end() const
Returns enumerator pointing on the next bit after the last.
Definition bm.h:1776
void sample(BV &bv_out, const BV &bv_in, size_type sample_count)
Get random subset of input vector.
Definition bmrandom.h:140
void PrintContainer(T first, T last)
Definition sample10.cpp:36
int main(void)
Definition sample10.cpp:47