From a58c06a102aeb1724909c43e1457f95daddc08f2 Mon Sep 17 00:00:00 2001
From: nojhan <nojhan@nojhan.net>
Date: Sat, 29 Mar 2014 14:51:23 +0100
Subject: [PATCH] Adds comparison with the classical way

---
 example.cpp | 34 +++++++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/example.cpp b/example.cpp
index 2e41e2c..5b624c5 100644
--- a/example.cpp
+++ b/example.cpp
@@ -1,6 +1,9 @@
 
 #include <iostream>
 #include <iomanip>
+#include <string>
+#include <sstream>
+#include <stdexcept>
 
 #include "exceptions.h" 
 
@@ -10,6 +13,21 @@ EXCEPTION( Exception, Existential_Observation );
         EXCEPTION( Buddhist_Observation, Zen_Observation );
     EXCEPTION( Existential_Observation, Pastafarism_Observation );
 
+
+// A somewhat similar code without this tool would be:
+// Inherit from runtime_error, because it has a virtual `what` interface.
+class _Existential_Observation : public std::runtime_error
+{ public:
+    // Pass through constructors
+    _Existential_Observation( const std::string & what_arg ) : std::runtime_error(what_arg) {}
+};
+
+class _Buddhist_Observation : public _Existential_Observation
+{ public:
+    _Buddhist_Observation( const std::string & what_arg ) : _Existential_Observation(what_arg) {}
+};
+
+
 int main()
 {
     try {
@@ -17,11 +35,25 @@ int main()
         // Use this macro to easily throw an exception with a dynamic message
         RAISE( Pastafarism_Observation, std::setprecision(3) << "Shit happens with " << pi << " noodly appendages" );
 
-        // Or, if you prefer, use the standard way, but you'll have to indicate E_INFOS yourself
+        // Or, if you prefer, use the standard `throw` function, but you'll have to indicate E_INFOS by yourself
         throw( Zen_Observation( "What is the sound of shit happening?", E_INFOS) );
 
     } catch( Existential_Observation & e ) {
         std::cerr << e.what() << std::endl;
     }
+
+
+    // Using the standard way, you will have to do
+    try {
+        std::ostringstream msg;
+        double vacuity = 0;
+        // Beware of the hard-coded class name...
+        msg << "There is " << vacuity << " shit happening (<_Buddhist_Observation in " << __FUNCTION__ << " at " << __FILE__ << ":" << __LINE__ << ")";
+        // And don't forget the string conversion.
+        throw( _Buddhist_Observation( msg.str() ) );
+
+    } catch( _Existential_Observation & e ) {
+        std::cerr << e.what() << std::endl;
+    }
 }