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Revision 4601, 0.7 KB
(checked in by pmoura, 7 weeks ago)
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Added svn:mime-type property to source files (set to text/x-logtalk).
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Property svn:mime-type set to
text/x-logtalk
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Property svn:eol-style set to
native
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| 1 | |
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| 2 | % simple example of defining an operator local to a source file |
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| 3 | |
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| 4 | |
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| 5 | :- op(200, xfx, edge). % global operator, visible within all |
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| 6 | % entities defined in this source file |
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| 7 | |
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| 8 | :- object(graph). |
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| 9 | |
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| 10 | :- public(path/3). |
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| 11 | :- public((edge)/2). |
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| 12 | |
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| 13 | path(Start, End, [Start, End]) :- |
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| 14 | ::(Start edge End). |
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| 15 | path(Start, End, [Start| Path]) :- |
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| 16 | ::(Start edge Node), |
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| 17 | path(Node, End, Path). |
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| 18 | |
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| 19 | :- end_object. |
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| 20 | |
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| 21 | |
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| 22 | :- object(graph1, |
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| 23 | extends(graph)). |
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| 24 | |
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| 25 | a edge b. |
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| 26 | a edge c. |
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| 27 | b edge d. |
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| 28 | c edge d. |
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| 29 | |
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| 30 | :- end_object. |
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| 31 | |
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| 32 | |
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| 33 | :- object(graph2, |
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| 34 | extends(graph)). |
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| 35 | |
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| 36 | v1 edge v2. |
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| 37 | v1 edge v3. |
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| 38 | v2 edge v4. |
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| 39 | v3 edge v4. |
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| 40 | |
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| 41 | :- end_object. |
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| 42 | |
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| 43 | |
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| 44 | :- op(0, xfx, edge). % "undefine" the operator, effectively |
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| 45 | % making it local to this source file |
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