Make histogram file unique pointer

src/core/Analysis.cpp

@@ -145,7 +145,7 @@ void Analysis::load_modules() {
 
     // Create histogram output file
     std::string histogramFile = global_config.getPath("histogramFile");
-    m_histogramFile = new TFile(histogramFile.c_str(), "RECREATE");
+    m_histogramFile = std::make_unique<TFile>(histogramFile.c_str(), "RECREATE");
     m_directory = m_histogramFile->mkdir("corryvreckan");
     if(m_histogramFile->IsZombie()) {
         throw RuntimeError("Cannot create main ROOT file " + histogramFile);

src/core/Analysis.hpp

@@ -66,7 +66,7 @@ namespace corryvreckan {
         // Log file if specified
         std::ofstream log_file_;
 
-        TFile* m_histogramFile;
+        std::unique_ptr<TFile> m_histogramFile;
         TDirectory* m_directory;
         int m_events;
         int m_tracks;