1.1 --- a/lemon/concepts/maps.h	Wed Sep 12 17:25:48 2012 +0200
     1.2 +++ b/lemon/concepts/maps.h	Thu Sep 13 11:56:19 2012 +0200
     1.3 @@ -49,7 +49,7 @@
     1.4  
     1.5        /// Returns the value associated with the given key.
     1.6        Value operator[](const Key &) const {
     1.7 -        return *static_cast<Value *>(0);
     1.8 +        return *(static_cast<Value *>(0)+1);
     1.9        }
    1.10  
    1.11        template<typename _ReadMap>
    1.12 @@ -68,6 +68,7 @@
    1.13          const Key& key;
    1.14          const typename _ReadMap::Key& own_key;
    1.15          const _ReadMap& m;
    1.16 +        Constraints() {}
    1.17        };
    1.18  
    1.19      };
    1.20 @@ -109,6 +110,7 @@
    1.21          const typename _WriteMap::Key& own_key;
    1.22          const typename _WriteMap::Value& own_val;
    1.23          _WriteMap& m;
    1.24 +        Constraints() {}
    1.25        };
    1.26      };
    1.27  
    1.28 @@ -129,7 +131,8 @@
    1.29  
    1.30        /// Returns the value associated with the given key.
    1.31        Value operator[](const Key &) const {
    1.32 -        return *static_cast<Value *>(0);
    1.33 +        Value *r = 0;
    1.34 +        return *r;
    1.35        }
    1.36  
    1.37        /// Sets the value associated with the given key.
    1.38 @@ -169,12 +172,14 @@
    1.39  
    1.40        /// Returns a reference to the value associated with the given key.
    1.41        Reference operator[](const Key &) {
    1.42 -        return *static_cast<Value *>(0);
    1.43 +        Value *r = 0;
    1.44 +        return *r;
    1.45        }
    1.46  
    1.47        /// Returns a const reference to the value associated with the given key.
    1.48        ConstReference operator[](const Key &) const {
    1.49 -        return *static_cast<Value *>(0);
    1.50 +        Value *r = 0;
    1.51 +        return *r;
    1.52        }
    1.53  
    1.54        /// Sets the value associated with the given key.
    1.55 @@ -205,6 +210,7 @@
    1.56          typename _ReferenceMap::Reference own_ref;
    1.57          typename _ReferenceMap::ConstReference own_cref;
    1.58          _ReferenceMap& m;
    1.59 +        Constraints() {}
    1.60        };
    1.61      };
    1.62