From 0528a1e49a82221e63039abc7f759a43f4d4ffc9 Mon Sep 17 00:00:00 2001
From: John Wiegley <johnw@newartisans.com>
Date: Fri, 4 May 2007 13:41:23 +0000
Subject: Added boost::optional support for using with Boost.Python.

---
 src/py_amount.cc | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

(limited to 'src/py_amount.cc')

diff --git a/src/py_amount.cc b/src/py_amount.cc
index 61e3e4b5..c4f476c3 100644
--- a/src/py_amount.cc
+++ b/src/py_amount.cc
@@ -1,7 +1,9 @@
 #include "pyinterp.h"
+#include "pyutils.h"
 #include "amount.h"
 
 #include <boost/python/exception_translator.hpp>
+#include <boost/python/implicit.hpp>
 
 namespace ledger {
 
@@ -21,6 +23,14 @@ amount_t py_round_2(const amount_t& amount) {
   return amount.round();
 }
 
+boost::optional<amount_t> py_value_1(const amount_t& amount,
+				     const boost::optional<moment_t>& moment) {
+  return amount.value(moment);
+}
+boost::optional<amount_t> py_value_2(const amount_t& amount) {
+  return amount.value();
+}
+
 #define EXC_TRANSLATOR(type)				\
   void exc_translate_ ## type(const type& err) {	\
     PyErr_SetString(PyExc_ArithmeticError, err.what());	\
@@ -161,7 +171,8 @@ void export_amount()
     .def("in_place_unreduce", &amount_t::in_place_unreduce,
 	 return_value_policy<reference_existing_object>())
 
-    .def("value", &amount_t::value)
+    .def("value", py_value_1)
+    .def("value", py_value_2)
 
     .def("sign", &amount_t::sign)
     .def("__nonzero__", &amount_t::nonzero)
@@ -213,6 +224,12 @@ void export_amount()
     .def("valid", &amount_t::valid)
     ;
 
+  python_optional<amount_t>();
+
+  implicitly_convertible<double, amount_t>();
+  implicitly_convertible<long, amount_t>();
+  implicitly_convertible<string, amount_t>();
+
 #define EXC_TRANSLATE(type) \
   register_exception_translator<type>(&exc_translate_ ## type);
 
-- 
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