Changeset 756:c54cf1e83039 in lemon0.x
 Timestamp:
 08/05/04 09:57:20 (20 years ago)
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 default
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 public
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 svn:c9d7d8f590d60310b91f818b3a526b0e/lemon/trunk@1016
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doc/graphs.dox
r666 r756 2 2 3 3 \page graphs How to use graphs 4 5 The primary data structures of HugoLib are the graph classes. They all 6 provide a node list  edge list interface, i.e. they have 7 functionalities to list the nodes and the edges of the graph as well 8 as in incoming and outgoing edges of a given node. 9 10 11 Each graph should meet the \ref ConstGraph concept. This concept does 12 makes it possible to change the graph (i.e. it is not possible to add 13 or delete edges or nodes). Most of the graph algorithms will run on 14 these graphs. 15 16 The graphs meeting the \ref ExtendableGraph concept allow node and 17 edge addition. You can also "clear" (i.e. erase all edges and nodes) 18 such a graph. 19 20 In case of graphs meeting the full feature \ref ErasableGraph concept 21 you can also erase individual edges and node in arbitrary order. 22 23 The implemented graph structures are the following. 24 \li \ref hugo::ListGraph "ListGraph" is the most versatile graph class. It meets 25 the ErasableGraph concept and it also have some convenience features. 26 \li \ref hugo::SmartGraph "SmartGraph" is a more memory 27 efficient version of \ref hugo::ListGraph "ListGraph". The 28 price of it is that it only meets the \ref ExtendableGraph concept, 29 so you cannot delete individual edges or nodes. 30 \li \ref hugo::SymListGraph "SymListGraph" and 31 \ref hugo::SymSmartGraph "SymSmartGraph" classes are very similar to 32 \ref hugo::ListGraph "ListGraph" and \ref hugo::SmartGraph "SmartGraph". 33 The difference is that whenever you add a 34 new edge to the graph, it actually adds a pair of oppositely directed edges. 35 They are linked together so it is possible to access the counterpart of an 36 edge. An even more important feature is that using these classes you can also 37 attach data to the edges in such a way that the stored data 38 are shared by the edge pairs. 39 \li \ref hugo::FullGraph "FullGraph" 40 implements a full graph. It is a \ref ConstGraph, so you cannot 41 change the number of nodes once it is constructed. It is extremely memory 42 efficient: it uses constant amount of memory independently from the number of 43 the nodes of the graph. Of course, the size of the \ref maps "NodeMap"'s and 44 \ref maps "EdgeMap"'s will depend on the number of nodes. 45 46 \li \ref hugo::NodeSet "NodeSet" implements a graph with no edges. This class 47 can be used as a base class of \ref hugo::EdgeSet "EdgeSet". 48 \li \ref hugo::EdgeSet "EdgeSet" can be used to create a new graph on 49 the edge set of another graph. The base graph can be an arbitrary graph and it 50 is possible to attach several \ref hugo::EdgeSet "EdgeSet"'s to a base graph. 51 52 \todo Don't we need SmartNodeSet and SmartEdgeSet? 53 \todo Some crossrefs are wrong. 54 55 56 The graph structures itself can not store data attached 57 to the edges and nodes. However they all provide 58 \ref maps "map classes" 59 to dynamically attach data the to graph components. 60 61 62 4 63 5 64 The following program demonstrates the basic features of HugoLib's graph
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