“Permanent” std::setw

#include <iostream>
#include <iomanip>
#include <algorithm>
#include <iterator>

int main( void )
{
  int array[] = { 1, 2, 4, 8, 16, 32, 64, 128, 256 };
  std::cout.fill( '0' );
  std::cout.flags( std::ios::hex );
  std::cout.width( 3 );

  std::copy( &array[0], &array[9], std::ostream_iterator<int>( std::cout, " " ) );

  std::cout << std::endl;

  for( int i = 0; i < 9; i++ )
  {
    std::cout.width( 3 );
    std::cout << array[i] << " ";
  }
  std::cout << std::endl;
}

#include <boost/function_output_iterator.hpp>
#include <boost/lambda/lambda.hpp>
#include <algorithm>
#include <iostream>
#include <iomanip>

int main() {
    using namespace boost::lambda;
    int a[] = { 1, 2, 3, 4 };
    std::copy(a, a + 4,
        boost::make_function_output_iterator(
              var(std::cout) << std::setw(3) << _1)
        );
}