export start_date

2 files changed, 20 insertions, 12 deletions

diff --git a/pyisda/credit_index.pxd b/pyisda/credit_index.pxd
index eadb8f8..12d405f 100644
--- a/pyisda/credit_index.pxd
+++ b/pyisda/credit_index.pxd
@@ -14,7 +14,7 @@ cdef class CurveList:
     cdef vector[TDate] defaulted
 
 cdef class CreditIndex(CurveList):
-    cdef TDate start_date
+    cdef TDate _start_date
     cdef vector[TDate] _maturities
     cdef TContingentLeg** contingent_legs
     cdef TFeeLeg** fee_legs
diff --git a/pyisda/credit_index.pyx b/pyisda/credit_index.pyx
index 75e1067..da9a177 100644
--- a/pyisda/credit_index.pyx
+++ b/pyisda/credit_index.pyx
@@ -209,7 +209,7 @@ cdef class CurveList:
 cdef class CreditIndex(CurveList):
     def __init__(self, start_date, maturities, list curves, value_date=None):
         super().__init__(curves, value_date)
-        self.start_date = pydate_to_TDate(start_date)
+        self._start_date = pydate_to_TDate(start_date)
         for d in maturities:
             self._maturities.push_back(pydate_to_TDate(d))
 
@@ -220,10 +220,18 @@ cdef class CreditIndex(CurveList):
         cdef size_t i
         cdef pair[TContingentLeg_ptr, TFeeLeg_ptr] r
         for i in range(self._maturities.size()):
-            r = get_legs(self._maturities[i], self.start_date)
+            r = get_legs(self._maturities[i], self._start_date)
             self.contingent_legs[i] = r.first
             self.fee_legs[i] = r.second
 
+    @property
+    def start_date(self):
+        return TDate_to_pydate(self._start_date)
+
+    @start_date.setter
+    def start_date(self, val):
+        self._start_date = pydate_to_TDate(val)
+
     def __dealloc__(self):
         if self.contingent_legs is not NULL:
             for i in range(self._maturities.size()):
@@ -263,7 +271,7 @@ cdef class CreditIndex(CurveList):
 
     def __reduce__(self):
         return (self.__class__,
-                (TDate_to_pydate(self.start_date), self.maturities, self.curves,
+                (self.start_date, self.maturities, self.curves,
                  TDate_to_pydate(self.base_date)))
 
     def __hash__(self):
@@ -289,7 +297,7 @@ cdef class CreditIndex(CurveList):
             h ^= Hash64(<char*>buf, buf_size)
 
         free(buf)
-        h = Hash64WithSeed(<char*>&self.start_date, sizeof(TDate), h)
+        h = Hash64WithSeed(<char*>&self._start_date, sizeof(TDate), h)
         h = Hash64WithSeed(<char*>&self.base_date, sizeof(TDate), h)
         h = Hash64WithSeed(<char*>self._maturities.data(), sizeof(TDate) * self._maturities.size(), h)
         h = Hash64WithSeed(<char*>self._weights.data(), sizeof(double) * self._weights.size(), h)
@@ -369,7 +377,7 @@ cdef class CreditIndex(CurveList):
             int i = get_maturity_index(maturity_c, self._maturities)
 
         if i == -1:
-            legs = get_legs(maturity_c, self.start_date)
+            legs = get_legs(maturity_c, self._start_date)
         else:
             legs.first = self.contingent_legs[i]
             legs.second = self.fee_legs[i]
@@ -415,7 +423,7 @@ cdef class CreditIndex(CurveList):
             i = get_maturity_index(maturity_c, self._maturities)
             if i == -1:
                 legs = get_legs(maturity_c,
-                                self.start_date)
+                                self._start_date)
             else:
                 legs.first = self.contingent_legs[i]
                 legs.second = self.fee_legs[i]
@@ -430,7 +438,7 @@ cdef class CreditIndex(CurveList):
         i = get_maturity_index(maturity_c, self._maturities)
         if i == -1:
             legs = get_legs(maturity_c,
-                            self.start_date)
+                            self._start_date)
         else:
             legs.first = self.contingent_legs[i]
             legs.second = self.fee_legs[i]
@@ -456,7 +464,7 @@ cdef class CreditIndex(CurveList):
             double* recovery_rate
 
         with nogil:
-            cl = JpmcdsCdsContingentLegMake(self.start_date,
+            cl = JpmcdsCdsContingentLegMake(self._start_date,
                                             maturity_c,
                                             1.,
                                             True)
@@ -493,7 +501,7 @@ cdef class CreditIndex(CurveList):
         found = get_maturity_index(maturity_c, self._maturities)
         if found == -1:
             JpmcdsStringToStubMethod(b"f/s", &stub_type)
-            fl = JpmcdsCdsFeeLegMake(self.start_date,
+            fl = JpmcdsCdsFeeLegMake(self._start_date,
                                      maturity_c,
                                      True,
                                      NULL,
@@ -547,7 +555,7 @@ cdef class CreditIndex(CurveList):
             self._maturities[i] = pydate_to_TDate(val[i])
             free(self.contingent_legs[i])
             JpmcdsFeeLegFree(self.fee_legs[i])
-            r = get_legs(self._maturities[i], self.start_date)
+            r = get_legs(self._maturities[i], self._start_date)
             self.contingent_legs[i] = r.first
             self.fee_legs[i] = r.second
 
@@ -629,7 +637,7 @@ cdef class CreditIndex(CurveList):
                 JpmcdsCdsParSpreads(
                     self.base_date,
                     self.base_date + 1,
-                    self.start_date,
+                    self._start_date,
                     n[1],
                     schedule_ptr,
                     True,