1.1 --- a/lemon/concepts/maps.h	Sun Feb 21 18:55:01 2010 +0100
     1.2 +++ b/lemon/concepts/maps.h	Fri Feb 26 17:08:30 2010 +0100
     1.3 @@ -182,8 +182,7 @@
     1.4  
     1.5        template<typename _ReferenceMap>
     1.6        struct Constraints {
     1.7 -        typename enable_if<typename _ReferenceMap::ReferenceMapTag, void>::type
     1.8 -        constraints() {
     1.9 +        void constraints() {
    1.10            checkConcept<ReadWriteMap<K, T>, _ReferenceMap >();
    1.11            ref = m[key];
    1.12            m[key] = val;