143 lines
5.6 KiB
Plaintext
143 lines
5.6 KiB
Plaintext
// boost progress.hpp header file ------------------------------------------//
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// Copyright Beman Dawes 1994-99. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/timer for documentation.
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// Revision History
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// 1 Dec 01 Add leading progress display strings (suggested by Toon Knapen)
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// 20 May 01 Introduce several static_casts<> to eliminate warning messages
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// (Fixed by Beman, reported by Herve Bronnimann)
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// 12 Jan 01 Change to inline implementation to allow use without library
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// builds. See docs for more rationale. (Beman Dawes)
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// 22 Jul 99 Name changed to .hpp
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// 16 Jul 99 Second beta
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// 6 Jul 99 Initial boost version
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#ifndef BOOST_PROGRESS_HPP
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#define BOOST_PROGRESS_HPP
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#include <boost/timer.hpp>
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#include <boost/noncopyable.hpp>
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#include <boost/cstdint.hpp> // for uintmax_t
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#include <iostream> // for ostream, cout, etc
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#include <string> // for string
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namespace boost {
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// progress_timer ----------------------------------------------------------//
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// A progress_timer behaves like a timer except that the destructor displays
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// an elapsed time message at an appropriate place in an appropriate form.
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class progress_timer : public timer, private noncopyable
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{
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public:
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explicit progress_timer( std::ostream & os = std::cout )
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// os is hint; implementation may ignore, particularly in embedded systems
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: timer(), noncopyable(), m_os(os) {}
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~progress_timer()
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{
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// A) Throwing an exception from a destructor is a Bad Thing.
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// B) The progress_timer destructor does output which may throw.
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// C) A progress_timer is usually not critical to the application.
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// Therefore, wrap the I/O in a try block, catch and ignore all exceptions.
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try
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{
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// use istream instead of ios_base to workaround GNU problem (Greg Chicares)
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std::istream::fmtflags old_flags = m_os.setf( std::istream::fixed,
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std::istream::floatfield );
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std::streamsize old_prec = m_os.precision( 2 );
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m_os << elapsed() << " s\n" // "s" is System International d'Unites std
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<< std::endl;
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m_os.flags( old_flags );
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m_os.precision( old_prec );
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}
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catch (...) {} // eat any exceptions
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} // ~progress_timer
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private:
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std::ostream & m_os;
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};
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// progress_display --------------------------------------------------------//
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// progress_display displays an appropriate indication of
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// progress at an appropriate place in an appropriate form.
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// NOTE: (Jan 12, 2001) Tried to change unsigned long to boost::uintmax_t, but
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// found some compilers couldn't handle the required conversion to double.
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// Reverted to unsigned long until the compilers catch up.
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class progress_display : private noncopyable
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{
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public:
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explicit progress_display( unsigned long expected_count_,
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std::ostream & os = std::cout,
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const std::string & s1 = "\n", //leading strings
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const std::string & s2 = "",
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const std::string & s3 = "" )
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// os is hint; implementation may ignore, particularly in embedded systems
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: noncopyable(), m_os(os), m_s1(s1), m_s2(s2), m_s3(s3) { restart(expected_count_); }
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void restart( unsigned long expected_count_ )
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// Effects: display appropriate scale
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// Postconditions: count()==0, expected_count()==expected_count_
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{
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_count = _next_tic_count = _tic = 0;
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_expected_count = expected_count_;
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m_os << m_s1 << "0% 10 20 30 40 50 60 70 80 90 100%\n"
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<< m_s2 << "|----|----|----|----|----|----|----|----|----|----|"
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<< std::endl // endl implies flush, which ensures display
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<< m_s3;
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if ( !_expected_count ) _expected_count = 1; // prevent divide by zero
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} // restart
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unsigned long operator+=( unsigned long increment )
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// Effects: Display appropriate progress tic if needed.
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// Postconditions: count()== original count() + increment
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// Returns: count().
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{
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if ( (_count += increment) >= _next_tic_count ) { display_tic(); }
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return _count;
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}
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unsigned long operator++() { return operator+=( 1 ); }
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unsigned long count() const { return _count; }
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unsigned long expected_count() const { return _expected_count; }
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private:
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std::ostream & m_os; // may not be present in all imps
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const std::string m_s1; // string is more general, safer than
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const std::string m_s2; // const char *, and efficiency or size are
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const std::string m_s3; // not issues
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unsigned long _count, _expected_count, _next_tic_count;
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unsigned int _tic;
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void display_tic()
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{
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// use of floating point ensures that both large and small counts
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// work correctly. static_cast<>() is also used several places
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// to suppress spurious compiler warnings.
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unsigned int tics_needed = static_cast<unsigned int>((static_cast<double>(_count)
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/ static_cast<double>(_expected_count)) * 50.0);
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do { m_os << '*' << std::flush; } while ( ++_tic < tics_needed );
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_next_tic_count =
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static_cast<unsigned long>((_tic/50.0) * static_cast<double>(_expected_count));
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if ( _count == _expected_count ) {
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if ( _tic < 51 ) m_os << '*';
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m_os << std::endl;
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}
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} // display_tic
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};
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} // namespace boost
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#endif // BOOST_PROGRESS_HPP
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