Implement members collection for infosets.

src/python/gambit/lib/infoset.pxi

@@ -39,4 +39,11 @@ cdef class Infoset:
             cdef Actions a
             a = Actions()
             a.infoset = self.infoset
-            return a
+            return a
+
+    property members:
+        def __get__(self):
+            cdef Members m
+            m = Members()
+            m.infoset = self.infoset
+            return m

src/python/gambit/lib/libgambit.pyx

@@ -72,6 +72,8 @@ cdef extern from "libgambit/game.h":
 
         int NumActions()
         c_GameAction GetAction(int) except +IndexError
+        int NumMembers()
+        c_GameNode GetMember(int) except +IndexError
 
     ctypedef struct c_GamePlayerRep "GamePlayerRep":
         c_Game GetGame()
@@ -168,7 +170,7 @@ include "strategies.pxi"
 
 include "action.pxi"
 include "actions.pxi"
-
+include "members.pxi"
 include "infoset.pxi"
 include "infosets.pxi"
 

src/python/gambit/lib/members.pxi

@@ -0,0 +1,16 @@
+cdef class Members:
+    cdef c_GameInfoset infoset
+
+    def __repr__(self):
+        return str(list(self))
+
+    def __len__(self):
+        return self.infoset.deref().NumMembers()
+
+    def __getitem__(self, i):
+        cdef Node n
+        if i < 0 or i >= len(self):
+            raise IndexError("no member with index '%s'" % i)
+        n = Node()
+        n.node = self.infoset.deref().GetMember(i+1)
+        return n