// Copyright (c) 2001 Jeremy Siek

// Copyright (c) 2008 Gennaro Prota

// Distributed under the Boost Software License, Version 1.0. (See

// accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

//

// Reads a bitset from the file named on the command line or, if no file

// name is given, from the standard input.

//

// Sample run:

//

// mask = 101010101010

// x.size() = 0

// Enter a bitset in binary: x = 100100010

//

// Input number: 100100010

// x.size() is now: 9

// As unsigned long: 290

// Mask (possibly resized): 010101010

// And with mask: 000100010

// Or with mask: 110101010

// Shifted left by 1: 001000100

// Shifted right by 1: 010010001

#include "boost/dynamic_bitset.hpp"

#include <cstdlib>

#include <fstream>

#include <iostream>

#include <stdexcept>

int

main( int argc, char * argv[] )

{

std::ifstream file;

if ( argc > 1 ) {

file.open( argv[ 1 ] );

}

std::istream & in = argc > 1 ? file : std::cin;

boost::dynamic_bitset<> mask( 12, 2730ul );

std::cout << "mask = " << mask << std::endl;

boost::dynamic_bitset<> x;

std::cout << "x.size() = " << x.size() << std::endl;

std::cout << "Enter a bitset in binary: x = " << std::flush;

if ( in >> x ) {

const std::size_t sz = x.size();

std::cout << std::endl;

std::cout << "Input number: " << x << std::endl;

std::cout << "x.size() is now: " << sz << std::endl;

bool fits_in_ulong = true;

unsigned long ul = 0;

try {

ul = x.to_ulong();

} catch ( std::overflow_error & ) {

fits_in_ulong = false;

}

std::cout << "As unsigned long: ";

if ( fits_in_ulong ) {

std::cout << ul;

} else {

std::cout << "(overflow exception)";

}

std::cout << std::endl;

mask.resize( sz );

std::cout << "Mask (possibly resized): " << mask << std::endl;

std::cout << "And with mask: " << ( x & mask ) << std::endl;

std::cout << "Or with mask: " << ( x | mask ) << std::endl;

std::cout << "Shifted left by 1: " << ( x << 1 ) << std::endl;

std::cout << "Shifted right by 1: " << ( x >> 1 ) << std::endl;

} else {

std::cerr << "Couldn't read a bitset" << std::endl;

return EXIT_FAILURE;

}

return 0;

}