LimitedWarning.hh

//STARTHEADER
// $Id: LimitedWarning.hh 2296 2011-06-28 14:47:21Z soyez $
//
// Copyright (c) 2005-2006, Matteo Cacciari and Gavin Salam
//
//----------------------------------------------------------------------
// This file is part of FastJet.
//
//  FastJet is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
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#ifndef __FASTJET_LIMITEDWARNING_HH__
#define __FASTJET_LIMITEDWARNING_HH__

#include "fastjet/internal/base.hh"
#include <iostream>
#include <string>

FASTJET_BEGIN_NAMESPACE

/// \if internal_doc
/// @ingroup internal
/// \class LimitedWarning
/// class to provide facilities for giving warnings up to some maximum
/// number of times
/// \endif
class LimitedWarning {
public:
  
  /// constructor that provides a default maximum number of warnings
  LimitedWarning() : _max_warn(_max_warn_default), _n_warn_so_far(0) {}

  /// constructor that provides a used-set max number of warnings
  LimitedWarning(int max_warn) : _max_warn(max_warn), _n_warn_so_far(0) {}

  /// output a warning to ostr
  void warn(const std::string & warning, std::ostream & ostr = std::cerr) {
    if (_n_warn_so_far < _max_warn) {
      ostr << "WARNING: ";
      ostr << warning;
      _n_warn_so_far++;
      if (_n_warn_so_far == _max_warn) ostr << " (LAST SUCH WARNING)";
      ostr << std::endl;
    }
  }

private:
  int _max_warn, _n_warn_so_far;
  static const int _max_warn_default = 5;
  
};

FASTJET_END_NAMESPACE

#endif // __FASTJET_LIMITEDWARNING_HH__