rscsample03.cpp

Example of how to use bm::rsc_sparse_vector<>::const_iterator.

Example of how to use bm::rsc_sparse_vector<>::const_iterator

See also
  bm::rsc_sparse_vector
  bm::rsc_sparse_vector::const_iterator
  bm::rsc_sparse_vector::const_iterator::go_to

/*
Copyright(c) 2002-2020 Anatoliy Kuznetsov(anatoliy_kuznetsov at yahoo.com)
Licensed 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.
For more information please visit: http://bitmagic.io
*/
/** \example rscsample03.cpp
Example of how to use bm::rsc_sparse_vector<>::const_iterator
\sa bm::rsc_sparse_vector
\sa bm::rsc_sparse_vector::const_iterator
\sa bm::rsc_sparse_vector::const_iterator::go_to
*/
/*! \file rscsample03.cpp
\brief Example: bm::rsc_sparse_vector<>::const_iterator
@sa rscsample02.cpp
*/
#include <iostream>
#include <vector>
#include "bm.h"
#include "bmsparsevec.h"
#include "bmsparsevec_compr.h"
#include "bmundef.h" /* clear the pre-proc defines from BM */
using namespace std;
/// Print sparse vector content
template<typename SV> void PrintSV(const SV& sv)
{
typename SV::const_iterator it = sv.begin();
typename SV::const_iterator it_end = sv.end();
for (; it != it_end; ++it)
{
if (it.is_null())
cout << "NULL";
else
cout << *it;
cout << ", ";
}
cout << endl;
}
typedef bm::sparse_vector<unsigned, bm::bvector<> > sparse_vector_u32;
typedef bm::rsc_sparse_vector<unsigned, sparse_vector_u32 > rsc_sparse_vector_u32;
int main(void)
{
try
{
rsc_sparse_vector_u32 csv1;
// add sample data using back insert iterator
//
{
auto bit = csv1.get_back_inserter();
bit = 10;
bit = 11;
bit.add_null();
bit = 13;
bit = 14;
bit.add_null(2);
bit = 256;
bit.flush();
}
// sync call updates rank-select index of the succinct container and
// it is necessary for the correct work of the const_iterator
// and bm::rsc_sparse_vector<>::decode()
// and bm::rsc_sparse_vector<>::decode_buf() methods
//
csv1.sync();
PrintSV(csv1); // 10, 11, NULL, 13, 14, NULL, NULL, 256,
// another way to use iterator at a random position
// is to use rsc_sparse_vector<>::get_const_iterator()
{
rsc_sparse_vector_u32::const_iterator it =
csv1.get_const_iterator(2);
if (it.valid()) // check if iterator is avlid and not at the end
{
do
{
auto v = it.value();
if (it.is_null())
cout << "NULL";
else
cout << v;
cout << ", ";
} while (it.advance()); // while it is able to advance
cout << endl;
// iterator can be re-positioned
//
it.go_to(3); // position iterator at 3
cout << it.value() << endl; // 13
}
}
}
catch(std::exception& ex)
{
std::cerr << ex.what() << std::endl;
return 1;
}
return 0;
}
bm.h
Compressed bit-vector bvector<> container, set algebraic methods, traversal iterators.
bmsparsevec.h
Sparse constainer sparse_vector<> for integer types using bit-transposition transform.
bmsparsevec_compr.h
Compressed sparse container rsc_sparse_vector<> for integer types.
bmundef.h
pre-processor un-defines to avoid global space pollution (internal)
bm::rsc_sparse_vector
Rank-Select compressed sparse vector.
Definition bmsparsevec_compr.h:59
bm::rsc_sparse_vector::get_back_inserter
back_insert_iterator get_back_inserter()
Definition bmsparsevec_compr.h:714
bm::rsc_sparse_vector::sync
void sync(bool force)
Re-calculate rank-select index for faster access to vector.
Definition bmsparsevec_compr.h:1442
bm::rsc_sparse_vector::get_const_iterator
const_iterator get_const_iterator(size_type idx) const BMNOEXCEPT
Get const_itertor re-positioned to specific element.
Definition bmsparsevec_compr.h:711
bm::sparse_vector
succinct sparse vector with runtime compression using bit-slicing / transposition method
Definition bmsparsevec.h:87
main
int main(void)
Definition sample1.cpp:43
sparse_vector_u32
bm::sparse_vector< unsigned, bm::bvector<> > sparse_vector_u32
Definition xsample02.cpp:68
rsc_sparse_vector_u32
bm::rsc_sparse_vector< unsigned, sparse_vector_u32 > rsc_sparse_vector_u32
Definition xsample03.cpp:205
PrintSV
void PrintSV(const SV &sv)
Print sparse vector.
Definition xsample06.cpp:91