[Boost-commit] svn:boost r73879 - sandbox/SOC/2011/checks/boost/checks

Subject: [Boost-commit] svn:boost r73879 - sandbox/SOC/2011/checks/boost/checks
From: pierre.talbot.6114_at_[hidden]
Date: 2011-08-18 08:06:37

Author: trademark
Date: 2011-08-18 08:06:36 EDT (Thu, 18 Aug 2011)
New Revision: 73879
URL: http://svn.boost.org/trac/boost/changeset/73879

Log:
Add AMERICAN EXPRESS implementation. Check and compute checkdigit.
Text files modified: 
   sandbox/SOC/2011/checks/boost/checks/amex.hpp |    44 ++++++++++++++++++++++++++++++++++----- 
   1 files changed, 38 insertions(+), 6 deletions(-)

Modified: sandbox/SOC/2011/checks/boost/checks/amex.hpp
==============================================================================
--- sandbox/SOC/2011/checks/boost/checks/amex.hpp	(original)
+++ sandbox/SOC/2011/checks/boost/checks/amex.hpp	2011-08-18 08:06:36 EDT (Thu, 18 Aug 2011)
@@ -1,20 +1,52 @@
-/  Boost checks/amex.hpp header file  ------------------------------------//
+//  Boost checks/amex.hpp header file  ------------------------------------//
 //  (C) Copyright Pierre Talbot 2011
 //  Distributed under the Boost Software License, Version 1.0. (See
 //  accompanying file LICENSE_1_0.txt or copy at
 //  http://www.boost.org/LICENSE_1_0.txt
 //  See http://www.boost.org for updates, documentation, and revision history.
 
-#ifndef BOOST_AMEX_INCLUDED
-#define BOOST_AMEX_INCLUDED
+// American express.
 
+#ifndef BOOST_CHECKS_AMEX_HPP
+#define BOOST_CHECKS_AMEX_HPP
+
+#include <boost/checks/luhn.hpp>
+
+#define AMEX_SIZE 15
+#define AMEX_SIZE_WITHOUT_CHECKDIGIT 14
 
 namespace boost {
     namespace checks{
 
-/* American express : use luhn algorithm */
+template <unsigned int number_of_virtual_value_skipped = 0>
+struct amex_algorithm : boost::checks::luhn_algorithm < number_of_virtual_value_skipped >
+{
+  static void filter_valid_value_with_pos(const unsigned int current_valid_value, const unsigned int current_value_position )
+  {
+    const unsigned int real_pos_from_left = AMEX_SIZE - current_value_position - number_of_virtual_value_skipped ;
+
+    if( real_pos_from_left == 1 && current_valid_value != 3)
+      throw std::invalid_argument("The Major Industry Identifier of an American Express should be 3.") ;
+    else if( real_pos_from_left == 2 && current_valid_value != 4 && current_valid_value != 7 ) 
+      throw std::invalid_argument("The Issuer Identification Number of an American Express should be 34 or 37." ) ;
+  }
+};
+
+typedef amex_algorithm<0> amex_check_algorithm ;
+typedef amex_algorithm<1> amex_compute_algorithm ;
+
+template <typename check_range>
+bool check_amex (const check_range& check_seq)
+{
+  return boost::checks::check_sequence<amex_check_algorithm, AMEX_SIZE> ( check_seq ) ;
+}
+
+template <typename check_range>
+typename boost::checks::amex_compute_algorithm::checkdigit<check_range>::type compute_amex (const check_range& check_seq)
+{
+  return boost::checks::compute_checkdigit<amex_compute_algorithm, AMEX_SIZE_WITHOUT_CHECKDIGIT> ( check_seq ) ;
+}
 
-} // namespace checks
-} // namespace boost
 
+}}
 #endif