X-Git-Url: http://g0dil.de/git?a=blobdiff_plain;f=senf%2FUtils%2Ftype_traits.hh;h=910b4e4c94771ec7ded41c6cc3562115554907f6;hb=9c0d069987191bce78e13cdba410c34d34e736c2;hp=a728ac0928f914b3710379c7c7d59155635201e2;hpb=26610f603ebdd465307b9621f532c1fe19fd5571;p=senf.git

diff --git a/senf/Utils/type_traits.hh b/senf/Utils/type_traits.hh
index a728ac0..910b4e4 100644
--- a/senf/Utils/type_traits.hh
+++ b/senf/Utils/type_traits.hh
@@ -243,6 +243,45 @@ namespace senf
         : public boost::remove_cv< typename boost::remove_reference<T>::type >
     {};
 
+    /** \brief Get arity of function T
+
+        \a T may be any function like type: function, pointer to function or (pointer to)
+        member-function.
+
+        \code
+        BOOST_STATIC_ASSERT(( senf::function_arity<void (Class::*)(int)>::value == 1 ));
+        \endcode
+     */
+    template < class T >
+    struct function_arity
+        : public boost::integral_constant<
+              unsigned,
+              boost::function_traits<
+                  typename senf::remove_any_pointer<T>::type>::arity>
+    {};
+
+    /** Test object if it is any \c std::pair type
+
+        if \a Pair is any \c std::pair type, this trait will inherit from \c boost::true_type,
+        otherwise it will inherit from \c boost::false_type.
+
+        \code
+        BOOST_STATIC_ASSERT((   senf::is_pair< std::pair<int,void*> >::value ));
+        BOOST_STATIC_ASSERT(( ! senf::is_pair< void () >::value ));
+        \endcode
+     */
+    template <class Pair>
+    struct is_pair
+        : public boost::false_type
+    {};
+
+#ifndef DOXYGEN
+    template <class First, class Second>
+    struct is_pair< std::pair<First,Second> >
+        : public boost::true_type
+    {};
+#endif
+
   ///}
 
 #ifndef DOXYGEN
@@ -261,8 +300,8 @@ namespace senf
 //#include "type_traits.ct"
 //#include "type_traits.cti"
 #endif
-
 
+
 // Local Variables:
 // mode: c++
 // fill-column: 100