Throw.h

// -*- C++ -*-
//
// Throw.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2019 Leif Lonnblad
//
// ThePEG is licenced under version 3 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef ThePEG_Throw_H
#define ThePEG_Throw_H
// This is the declaration of the Throw class.

#include "ThePEG/Config/ThePEG.h"
#include "ThePEG/Utilities/Exception.h"
#include "ThePEG/Repository/CurrentGenerator.h"
#include "ThePEG/Repository/Repository.h"


namespace ThePEG {
template <typename Ex>
struct Throw {
public:
  Throw(): ex(Ex()), handled(false) {}

  template <typename T> Throw & operator<<(const T & t) {
    ex << t;
    return *this;
  }

private:
  void writeWarning() {
    if ( CurrentGenerator::isVoid() ) {
      Repository::clog() << ex.message() << endl;
      ex.handle();
    } else {
      CurrentGenerator::current().logWarning(ex);
    }
  }

public:
  void operator<<(Exception::Severity sev) {
    handled = true;
    ex << sev;
    if ( sev != Exception::warning && sev != Exception::info  ) {
      throw ex;
    } else {
      writeWarning();
    }
  }

  ~Throw() {
    if ( !handled ) {
        ex << Exception::warning;
        writeWarning();
    }
  }

  Ex ex;

  bool handled;
};


}

#endif /* ThePEG_Throw_H */