1 // boost progress.hpp header file ------------------------------------------// 2 3 // Copyright Beman Dawes 1994-99. Distributed under the Boost 4 // Software License, Version 1.0. (See accompanying file 5 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 6 7 // See http://www.boost.org/libs/timer for documentation. 8 9 // Revision History 10 // 1 Dec 01 Add leading progress display strings (suggested by Toon Knapen) 11 // 20 May 01 Introduce several static_casts<> to eliminate warning messages 12 // (Fixed by Beman, reported by Herve Bronnimann) 13 // 12 Jan 01 Change to inline implementation to allow use without library 14 // builds. See docs for more rationale. (Beman Dawes) 15 // 22 Jul 99 Name changed to .hpp 16 // 16 Jul 99 Second beta 17 // 6 Jul 99 Initial boost version 18 19 #ifndef BOOST_PROGRESS_HPP 20 #define BOOST_PROGRESS_HPP 21 22 #include <boost/timer.hpp> 23 #include <boost/utility.hpp> // for noncopyable 24 #include <boost/cstdint.hpp> // for uintmax_t 25 #include <iostream> // for ostream, cout, etc 26 #include <string> // for string 27 28 namespace boost { 29 30 // progress_timer ----------------------------------------------------------// 31 32 // A progress_timer behaves like a timer except that the destructor displays 33 // an elapsed time message at an appropriate place in an appropriate form. 34 35 class progress_timer : public timer, private noncopyable 36 { 37 38 public: progress_timer(std::ostream & os=std::cout)39 explicit progress_timer( std::ostream & os = std::cout ) 40 // os is hint; implementation may ignore, particularly in embedded systems 41 : m_os(os) {} ~progress_timer()42 ~progress_timer() 43 { 44 // A) Throwing an exception from a destructor is a Bad Thing. 45 // B) The progress_timer destructor does output which may throw. 46 // C) A progress_timer is usually not critical to the application. 47 // Therefore, wrap the I/O in a try block, catch and ignore all exceptions. 48 try 49 { 50 // use istream instead of ios_base to workaround GNU problem (Greg Chicares) 51 std::istream::fmtflags old_flags = m_os.setf( std::istream::fixed, 52 std::istream::floatfield ); 53 std::streamsize old_prec = m_os.precision( 2 ); 54 m_os << elapsed() << " s\n" // "s" is System International d'Unites std 55 << std::endl; 56 m_os.flags( old_flags ); 57 m_os.precision( old_prec ); 58 } 59 60 catch (...) {} // eat any exceptions 61 } // ~progress_timer 62 63 private: 64 std::ostream & m_os; 65 }; 66 67 68 // progress_display --------------------------------------------------------// 69 70 // progress_display displays an appropriate indication of 71 // progress at an appropriate place in an appropriate form. 72 73 // NOTE: (Jan 12, 2001) Tried to change unsigned long to boost::uintmax_t, but 74 // found some compilers couldn't handle the required conversion to double. 75 // Reverted to unsigned long until the compilers catch up. 76 77 class progress_display : private noncopyable 78 { 79 public: progress_display(unsigned long expected_count,std::ostream & os=std::cout,const std::string & s1="\\n",const std::string & s2="",const std::string & s3="")80 explicit progress_display( unsigned long expected_count, 81 std::ostream & os = std::cout, 82 const std::string & s1 = "\n", //leading strings 83 const std::string & s2 = "", 84 const std::string & s3 = "" ) 85 // os is hint; implementation may ignore, particularly in embedded systems 86 : m_os(os), m_s1(s1), m_s2(s2), m_s3(s3) { restart(expected_count); } 87 restart(unsigned long expected_count)88 void restart( unsigned long expected_count ) 89 // Effects: display appropriate scale 90 // Postconditions: count()==0, expected_count()==expected_count 91 { 92 _count = _next_tic_count = _tic = 0; 93 _expected_count = expected_count; 94 95 m_os << m_s1 << "0% 10 20 30 40 50 60 70 80 90 100%\n" 96 << m_s2 << "|----|----|----|----|----|----|----|----|----|----|" 97 << std::endl // endl implies flush, which ensures display 98 << m_s3; 99 if ( !_expected_count ) _expected_count = 1; // prevent divide by zero 100 } // restart 101 operator +=(unsigned long increment)102 unsigned long operator+=( unsigned long increment ) 103 // Effects: Display appropriate progress tic if needed. 104 // Postconditions: count()== original count() + increment 105 // Returns: count(). 106 { 107 if ( (_count += increment) >= _next_tic_count ) { display_tic(); } 108 return _count; 109 } 110 operator ++()111 unsigned long operator++() { return operator+=( 1 ); } count() const112 unsigned long count() const { return _count; } expected_count() const113 unsigned long expected_count() const { return _expected_count; } 114 115 private: 116 std::ostream & m_os; // may not be present in all imps 117 const std::string m_s1; // string is more general, safer than 118 const std::string m_s2; // const char *, and efficiency or size are 119 const std::string m_s3; // not issues 120 121 unsigned long _count, _expected_count, _next_tic_count; 122 unsigned int _tic; display_tic()123 void display_tic() 124 { 125 // use of floating point ensures that both large and small counts 126 // work correctly. static_cast<>() is also used several places 127 // to suppress spurious compiler warnings. 128 unsigned int tics_needed = 129 static_cast<unsigned int>( 130 (static_cast<double>(_count)/_expected_count)*50.0 ); 131 do { m_os << '*' << std::flush; } while ( ++_tic < tics_needed ); 132 _next_tic_count = 133 static_cast<unsigned long>((_tic/50.0)*_expected_count); 134 if ( _count == _expected_count ) { 135 if ( _tic < 51 ) m_os << '*'; 136 m_os << std::endl; 137 } 138 } // display_tic 139 }; 140 141 } // namespace boost 142 143 #endif // BOOST_PROGRESS_HPP 144