1.1 --- a/lemon/concepts/maps.h	Fri Jan 06 16:27:06 2012 +0100
     1.2 +++ b/lemon/concepts/maps.h	Thu Jan 19 15:25:06 2012 +0100
     1.3 @@ -68,6 +68,7 @@
     1.4          const Key& key;
     1.5          const typename _ReadMap::Key& own_key;
     1.6          const _ReadMap& m;
     1.7 +        Constraints() {}
     1.8        };
     1.9  
    1.10      };
    1.11 @@ -109,6 +110,7 @@
    1.12          const typename _WriteMap::Key& own_key;
    1.13          const typename _WriteMap::Value& own_val;
    1.14          _WriteMap& m;
    1.15 +        Constraints() {}
    1.16        };
    1.17      };
    1.18  
    1.19 @@ -129,7 +131,8 @@
    1.20  
    1.21        /// Returns the value associated with the given key.
    1.22        Value operator[](const Key &) const {
    1.23 -        return *static_cast<Value *>(0);
    1.24 +        Value *r = 0;
    1.25 +        return *r;
    1.26        }
    1.27  
    1.28        /// Sets the value associated with the given key.
    1.29 @@ -169,12 +172,14 @@
    1.30  
    1.31        /// Returns a reference to the value associated with the given key.
    1.32        Reference operator[](const Key &) {
    1.33 -        return *static_cast<Value *>(0);
    1.34 +        Value *r = 0;
    1.35 +        return *r;
    1.36        }
    1.37  
    1.38        /// Returns a const reference to the value associated with the given key.
    1.39        ConstReference operator[](const Key &) const {
    1.40 -        return *static_cast<Value *>(0);
    1.41 +        Value *r = 0;
    1.42 +        return *r;
    1.43        }
    1.44  
    1.45        /// Sets the value associated with the given key.
    1.46 @@ -205,6 +210,7 @@
    1.47          typename _ReferenceMap::Reference own_ref;
    1.48          typename _ReferenceMap::ConstReference own_cref;
    1.49          _ReferenceMap& m;
    1.50 +        Constraints() {}
    1.51        };
    1.52      };
    1.53