#include "TCanvas.h"
#include "TROOT.h"
#include <iostream>
#include <TH2.h>
#include <TH1D.h>
#include "TFile.h"
#include "TLegend.h"

void mwe(){
  TFile *ttbar = TFile::Open("ttbar_out.root"); //in this file are those histograms that I want to take out and use
  TH1D *ttbar1_pt = (TH1D*)ttbar->Get("h_muon1_pt");
  TH1D *ttbar1_eta = (TH1D*)ttbar->Get("h_muon1_eta");
  TH1D *ttbar1_phi = (TH1D*)ttbar->Get("h_muon1_phi");
  
  std::vector<string> names {"ttbar1_pt", "ttbar1_eta", "ttbar1_phi"};
  std::vector<TH1D::TH1D*> histos; //pointer to histograms
  
  for (const auto& name: names){
    histo.push_back(static_cast<TH1D*>(name))
      };
  for (auto histo:histos){
    histo->SetFillStyle(1001);
  }; //such piece of code would be here multiple times, for top + W, for dibosons, etc.
 
   TCanvas *Canvas1_pt = new TCanvas("Canvas1_pt", "muon1 pt", 1000, 800);
   ttbar1_pt->Draw("same hist"); //I chose one of them
}