From c5cab1feb6f6619984f7071b9a33a8b77971c4a3 Mon Sep 17 00:00:00 2001
From: Henry Fredrick Schreiner <henry.fredrick.schreiner@cern.ch>
Date: Sat, 4 Feb 2017 11:44:23 -0500
Subject: [PATCH] Adding place to inject code before callbacks

---
 include/CLI.hpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/CLI.hpp b/include/CLI.hpp
index 09c691dc..5cfd52c5 100644
--- a/include/CLI.hpp
+++ b/include/CLI.hpp
@@ -1111,6 +1111,9 @@ public:
         return make_set(name, options, discription, opts|opts2, args...);
     }
 
+    /// This allows subclasses to inject code before callbacks but after parse
+    virtual void pre_callback() {}
+
     /// Parses the command line - throws errors
     void parse(int argc, char **argv) {
         progname = argv[0];
@@ -1172,6 +1175,7 @@ public:
         if(positionals.size()>0)
             throw PositionalError("[" + detail::join(positionals) + "]");
 
+        pre_callback();
         run_callback();
     }