add template_arity test

[SVN r19407]

test/aux_/Jamfile

@@ -10,3 +10,4 @@ compile has_distance.cpp ;
 compile has_xxx.cpp ;
 compile no_has_xxx.cpp ;
 compile typeof.cpp ;
+compile template_arity.cpp ;

test/aux_/template_arity.cpp

@@ -0,0 +1,39 @@
+
+// + file: libs/mpl/test/aux_/template_arity.cpp
+// + last modified: 10/jul/03
+
+// Copyright (c) 2000-03
+// Aleksey Gurtovoy
+//
+// Permission to use, copy, modify, distribute and sell this software
+// and its documentation for any purpose is hereby granted without fee, 
+// provided that the above copyright notice appears in all copies and 
+// that both the copyright notice and this permission notice appear in 
+// supporting documentation. No representations are made about the 
+// suitability of this software for any purpose. It is provided "as is" 
+// without express or implied warranty.
+//
+// See http://www.boost.org/libs/mpl for documentation.
+
+#include "boost/mpl/aux_/template_arity.hpp"
+#include "boost/static_assert.hpp"
+
+#   if defined(BOOST_EXTENDED_TEMPLATE_PARAMETERS_MATCHING)
+
+using namespace boost::mpl;
+
+struct my {};
+template< typename T1 > struct my1 {};
+template< typename T1, typename T2 = void > struct my2 {};
+
+int main()
+{
+    BOOST_STATIC_ASSERT((aux::template_arity<my>::value == -1));
+    BOOST_STATIC_ASSERT((aux::template_arity< my1<int> >::value == 1));
+    BOOST_STATIC_ASSERT((aux::template_arity< my2<int,long> >::value == 2));
+    BOOST_STATIC_ASSERT((aux::template_arity< my2<int> >::value == 2));
+    
+    return 0;
+}
+
+#   endif