BitMagic-C++: sample2.cpp

BitMagic-C++

sample2.cpp

Example demonstrates using set operations AND, OR, XOR, etc.

See also
  bvsetalgebra.cpp

/*
Copyright(c) 2002-2017 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 sample2.cpp
Example demonstrates using set operations AND, OR, XOR, etc.
\sa bvsetalgebra.cpp
*/
/*! \file sample2.cpp
\brief Example: bvector<> set algebra operations AND, OR, XOR, etc.
*/
#include <iostream>
#include "bm.h"
using namespace std;
static
void print_bvector(const bm::bvector<>& bv)
{
bm::bvector<>::size_type value = bv. get_first();
do
{
cout << value;
value = bv. get_next(value);
if (value)
{
cout << ",";
}
else
{
break;
}
} while(1);
cout << endl;
}
int main(void)
{
try
{
bm::bvector<> bv1;
bm::bvector<> bv2;
bm::bvector<> bv3;
bv1. set(10);
bv1.set(100);
bv1.set(1000000);
bv2.set(10);
bv2.set(100);
// Logical AND operation on bv2 (bv1 is the argument)
// bv2 = bv2 AND bv1
bv3 = bv1 & bv2;
print_bvector(bv3);
bv2 &= bv1; // You also can use: bv2.bit_and(bv1);
print_bvector(bv2);
// bv2 = bv2 OR bv1
bv3 = bv1 | bv2;
print_bvector(bv3);
bv2 |= bv1; // You can also use: bv2.bit_or(bv1);
print_bvector(bv2);
bv1.set(1000000, false);
// bv2 = bv2 SUB bv1
bv3 = bv2 - bv1;
print_bvector(bv3);
bv2 -= bv1; // You can also use: bv2.bit_sub(bv1);
print_bvector(bv2);
// bv2 XOR bv1
bv3 = bv2 ^ bv1;
print_bvector(bv3);
// product of XOR is a mismatch vector (definition of XOR)
//
{
bm::bvector<>::size_type pos;
bool f = bv3. find(pos);
if (f)
{
cout << "XOR mismatch position = " << pos << endl;
}
// if we need to find only first mismatch we don't need a full
// XOR product, we can use bvector<>::find_first_mismatch()
//
f = bv2. find_first_mismatch(bv1, pos);
if (f)
{
cout << "search mismatch position = " << pos << endl;
}
}
bv2 ^= bv1; // You can also use: bv2.bit_xor(bv1);
print_bvector(bv2);
// For lexicographical comparison there is set of overloaded
// operators and function compare (see also bvector<>::equal() )
if (bv2 == bv3)
{
cerr << "Equivalent. Comparison result = "
<< bv2.compare(bv3) << endl;
}
else
{
cout << "Error." << endl;
return 1;
}
}
catch(std::exception& ex)
{
std::cerr << ex.what() << std::endl;
}
return 0;
}
main
int main(void)
Definition: sample2.cpp:53
bm::bvector::find_first_mismatch
bool find_first_mismatch(const bvector< Alloc > &bvect, size_type &pos, size_type search_to=bm::id_max) const BMNOEXCEPT
Find index of first bit different between this and the agr vector.
Definition: bm.h:3277
bm::bvector<>
bm::bvector::set
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
bm::bvector::find
bool find(size_type &pos) const BMNOEXCEPT
Finds index of first 1 bit.
Definition: bm.h:4035
print_bvector
static void print_bvector(const bm::bvector<> &bv)
Definition: sample2.cpp:34
bm::bvector::get_next
size_type get_next(size_type prev) const BMNOEXCEPT
Finds the number of the next bit ON.
Definition: bm.h:1540
bm::bvector::get_first
size_type get_first() const BMNOEXCEPT
find first 1 bit in vector. Function may return 0 and this requires an extra check if bit 0 is actual...
Definition: bm.h:1531
bm::bvector::size_type
bm::id_t size_type
Definition: bm.h:117
bm.h
Compressed bit-vector bvector<> container, set algebraic methods, traversal iterators.