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+//  boost progress.hpp header file  ------------------------------------------//
+
+//  Copyright Beman Dawes 1994-99.  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)
+
+//  See http://www.boost.org/libs/timer for documentation.
+
+//  Revision History
+//   1 Dec 01  Add leading progress display strings (suggested by Toon Knapen)
+//  20 May 01  Introduce several static_casts<> to eliminate warning messages
+//             (Fixed by Beman, reported by Herve Bronnimann)
+//  12 Jan 01  Change to inline implementation to allow use without library
+//             builds. See docs for more rationale. (Beman Dawes) 
+//  22 Jul 99  Name changed to .hpp
+//  16 Jul 99  Second beta
+//   6 Jul 99  Initial boost version
+
+#ifndef BOOST_PROGRESS_HPP
+#define BOOST_PROGRESS_HPP
+
+#include <boost/timer.hpp>
+#include <boost/utility.hpp>  // for noncopyable
+#include <boost/cstdint.hpp>  // for uintmax_t
+#include <iostream>           // for ostream, cout, etc
+#include <string>             // for string
+
+namespace boost {
+
+//  progress_timer  ----------------------------------------------------------//
+
+//  A progress_timer behaves like a timer except that the destructor displays
+//  an elapsed time message at an appropriate place in an appropriate form.
+
+class progress_timer : public timer, private noncopyable
+{
+  
+ public:
+  explicit progress_timer( std::ostream & os = std::cout )
+     // os is hint; implementation may ignore, particularly in embedded systems
+     : m_os(os) {}
+  ~progress_timer()
+  {
+  //  A) Throwing an exception from a destructor is a Bad Thing.
+  //  B) The progress_timer destructor does output which may throw.
+  //  C) A progress_timer is usually not critical to the application.
+  //  Therefore, wrap the I/O in a try block, catch and ignore all exceptions.
+    try
+    {
+      // use istream instead of ios_base to workaround GNU problem (Greg Chicares)
+      std::istream::fmtflags old_flags = m_os.setf( std::istream::fixed,
+                                                   std::istream::floatfield );
+      std::streamsize old_prec = m_os.precision( 2 );
+      m_os << elapsed() << " s\n" // "s" is System International d'Unites std
+                        << std::endl;
+      m_os.flags( old_flags );
+      m_os.precision( old_prec );
+    }
+
+    catch (...) {} // eat any exceptions
+  } // ~progress_timer
+
+ private:
+  std::ostream & m_os;
+};
+
+
+//  progress_display  --------------------------------------------------------//
+
+//  progress_display displays an appropriate indication of 
+//  progress at an appropriate place in an appropriate form.
+
+// NOTE: (Jan 12, 2001) Tried to change unsigned long to boost::uintmax_t, but
+// found some compilers couldn't handle the required conversion to double.
+// Reverted to unsigned long until the compilers catch up. 
+
+class progress_display : private noncopyable
+{
+ public:
+  explicit progress_display( unsigned long expected_count,
+                             std::ostream & os = std::cout,
+                             const std::string & s1 = "\n", //leading strings
+                             const std::string & s2 = "",
+                             const std::string & s3 = "" )
+   // os is hint; implementation may ignore, particularly in embedded systems
+   : m_os(os), m_s1(s1), m_s2(s2), m_s3(s3) { restart(expected_count); }
+
+  void           restart( unsigned long expected_count )
+  //  Effects: display appropriate scale
+  //  Postconditions: count()==0, expected_count()==expected_count
+  {
+    _count = _next_tic_count = _tic = 0;
+    _expected_count = expected_count;
+
+    m_os << m_s1 << "0%   10   20   30   40   50   60   70   80   90   100%\n"
+         << m_s2 << "|----|----|----|----|----|----|----|----|----|----|"
+         << std::endl  // endl implies flush, which ensures display
+         << m_s3;
+    if ( !_expected_count ) _expected_count = 1;  // prevent divide by zero
+  } // restart
+
+  unsigned long  operator+=( unsigned long increment )
+  //  Effects: Display appropriate progress tic if needed.
+  //  Postconditions: count()== original count() + increment
+  //  Returns: count().
+  {
+    if ( (_count += increment) >= _next_tic_count ) { display_tic(); }
+    return _count;
+  }
+
+  unsigned long  operator++()           { return operator+=( 1 ); }
+  unsigned long  count() const          { return _count; }
+  unsigned long  expected_count() const { return _expected_count; }
+
+  private:
+  std::ostream &     m_os;  // may not be present in all imps
+  const std::string  m_s1;  // string is more general, safer than 
+  const std::string  m_s2;  //  const char *, and efficiency or size are
+  const std::string  m_s3;  //  not issues
+
+  unsigned long _count, _expected_count, _next_tic_count;
+  unsigned int  _tic;
+  void display_tic()
+  {
+    // use of floating point ensures that both large and small counts
+    // work correctly.  static_cast<>() is also used several places
+    // to suppress spurious compiler warnings. 
+    unsigned int tics_needed =
+      static_cast<unsigned int>(
+        (static_cast<double>(_count)/_expected_count)*50.0 );
+    do { m_os << '*' << std::flush; } while ( ++_tic < tics_needed );
+    _next_tic_count = 
+      static_cast<unsigned long>((_tic/50.0)*_expected_count);
+    if ( _count == _expected_count ) {
+      if ( _tic < 51 ) m_os << '*';
+      m_os << std::endl;
+      }
+  } // display_tic
+};
+
+} // namespace boost
+
+#endif  // BOOST_PROGRESS_HPP