1.1 --- a/lemon/circulation.h	Tue Dec 02 15:33:22 2008 +0000
     1.2 +++ b/lemon/circulation.h	Fri Dec 05 00:22:47 2008 +0100
     1.3 @@ -419,7 +419,7 @@
     1.4      ///
     1.5      /// \pre Either \ref run() or \ref init() must be called before
     1.6      /// using this function.
     1.7 -    const Elevator& elevator() {
     1.8 +    const Elevator& elevator() const {
     1.9        return *_level;
    1.10      }
    1.11  
    1.12 @@ -644,7 +644,7 @@
    1.13      ///
    1.14      /// \pre Either \ref run() or \ref init() must be called before
    1.15      /// using this function.
    1.16 -    const FlowMap& flowMap() {
    1.17 +    const FlowMap& flowMap() const {
    1.18        return *_flow;
    1.19      }
    1.20  
    1.21 @@ -669,7 +669,7 @@
    1.22         \sa barrierMap()
    1.23         \sa checkBarrier()
    1.24      */
    1.25 -    bool barrier(const Node& node)
    1.26 +    bool barrier(const Node& node) const
    1.27      {
    1.28        return (*_level)[node] >= _el;
    1.29      }
    1.30 @@ -692,7 +692,7 @@
    1.31      /// \sa barrier()
    1.32      /// \sa checkBarrier()
    1.33      template<class BarrierMap>
    1.34 -    void barrierMap(BarrierMap &bar)
    1.35 +    void barrierMap(BarrierMap &bar) const
    1.36      {
    1.37        for(NodeIt n(_g);n!=INVALID;++n)
    1.38          bar.set(n, (*_level)[n] >= _el);
    1.39 @@ -712,7 +712,7 @@
    1.40  
    1.41      ///Check if the found flow is a feasible circulation,
    1.42      ///
    1.43 -    bool checkFlow() {
    1.44 +    bool checkFlow() const {
    1.45        for(ArcIt e(_g);e!=INVALID;++e)
    1.46          if((*_flow)[e]<(*_lo)[e]||(*_flow)[e]>(*_up)[e]) return false;
    1.47        for(NodeIt n(_g);n!=INVALID;++n)
    1.48 @@ -730,7 +730,7 @@
    1.49      ///Check whether or not the last execution provides a barrier.
    1.50      ///\sa barrier()
    1.51      ///\sa barrierMap()
    1.52 -    bool checkBarrier()
    1.53 +    bool checkBarrier() const
    1.54      {
    1.55        Value delta=0;
    1.56        for(NodeIt n(_g);n!=INVALID;++n)