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   180       /// Sets the value associated with the given key.  | 
   180       /// Sets the value associated with the given key.  | 
   181       void set(const Key &k,const Value &t) { operator[](k)=t; } | 
   181       void set(const Key &k,const Value &t) { operator[](k)=t; } | 
   182   | 
   182   | 
   183       template<typename _ReferenceMap>  | 
   183       template<typename _ReferenceMap>  | 
   184       struct Constraints { | 
   184       struct Constraints { | 
   185         typename enable_if<typename _ReferenceMap::ReferenceMapTag, void>::type  | 
   185         void constraints() { | 
   186         constraints() { | 
         | 
   187           checkConcept<ReadWriteMap<K, T>, _ReferenceMap >();  | 
   186           checkConcept<ReadWriteMap<K, T>, _ReferenceMap >();  | 
   188           ref = m[key];  | 
   187           ref = m[key];  | 
   189           m[key] = val;  | 
   188           m[key] = val;  | 
   190           m[key] = ref;  | 
   189           m[key] = ref;  | 
   191           m[key] = cref;  | 
   190           m[key] = cref;  |