quietHistFit.cxx

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// quietHistFit.cxx

#include "dunecore/DuneCommon/Utility/quietHistFit.h"
#include "TFitResult.h"

#include "TF1.h"
#include "TH1F.h"

//**********************************************************************

namespace {

// Convert fit result to an int that is 0 for success.
int get(TFitResultPtr pres) {
  if ( pres.Get() == nullptr ) return pres;
  if ( pres->IsValid() ) return 0;
  if ( pres->Status() ) return pres->Status();
  return 99;
}

}

//**********************************************************************

int quietHistFit(TH1* ph, std::string fname, std::string fopt) {
  // Block Root info message for new Canvas produced in fit.
  int levelSave = gErrorIgnoreLevel;
  gErrorIgnoreLevel = 1002;
  // Block non-default (e.g. art) from handling the Root "error".
  // We switch to the Root default handler while making the call to Print.
  ErrorHandlerFunc_t pehSave = nullptr;
  ErrorHandlerFunc_t pehDefault = DefaultErrorHandler;
  if ( GetErrorHandler() != pehDefault ) {
    pehSave = SetErrorHandler(pehDefault);
  }
  int fstat = get(ph->Fit(fname.c_str(), fopt.c_str()));
  if ( pehSave != nullptr ) SetErrorHandler(pehSave);
  gErrorIgnoreLevel = levelSave;
  return fstat;
}

//**********************************************************************

int quietHistFit(TH1* ph, TF1* pf, std::string fopt) {
  // Block Root info message for new Canvas produced in fit.
  int levelSave = gErrorIgnoreLevel;
  gErrorIgnoreLevel = 1002;
  // Block non-default (e.g. art) from handling the Root "error".
  // We switch to the Root default handler while making the call to Print.
  ErrorHandlerFunc_t pehSave = nullptr;
  ErrorHandlerFunc_t pehDefault = DefaultErrorHandler;
  if ( GetErrorHandler() != pehDefault ) {
    pehSave = SetErrorHandler(pehDefault);
  }
  int fstat = get(ph->Fit(pf, fopt.c_str()));
  if ( pehSave != nullptr ) SetErrorHandler(pehSave);
  gErrorIgnoreLevel = levelSave;
  return fstat;
}

//**********************************************************************