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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Segmentation Fault in GraphIO.writeGML","articleBody":"The following code causes a segmentation fault:\r\n\r\n```\r\nfrom ogdf_python import ogdf\r\n\r\nG = ogdf.Graph()\r\nGA = ogdf.GraphAttributes(G, ogdf.GraphAttributes.all)\r\nG.newNode()\r\n\r\nogdf.GraphIO.write(GA, \"foo.gml\", ogdf.GraphIO.writeGML)\r\n```\r\n\r\n```\r\n---------------------------------------------------------------------------\r\nTypeError                                 Traceback (most recent call last)\r\nCell In [1], line 8\r\n      5 GA = ogdf.GraphAttributes(G, ogdf.GraphAttributes.all)\r\n      6 G.newNode()\r\n----\u003e 8 ogdf.GraphIO.write(GA, \"foo.gml\", ogdf.GraphIO.writeGML)\r\n\r\nTypeError: static bool ogdf::GraphIO::write(const ogdf::GraphAttributes\u0026 GA, const std::string\u0026 filename, ogdf::GraphIO::AttrWriterFunc writer = nullptr) =\u003e\r\n    TypeError: none of the 4 overloaded methods succeeded. Full details:\r\n  static bool ogdf::GraphIO::writeGML(const ogdf::ClusterGraph\u0026 C, std::ostream\u0026 os) =\u003e\r\n    TypeError: could not convert argument 1\r\n  static bool ogdf::GraphIO::writeGML(const ogdf::ClusterGraphAttributes\u0026 A, std::ostream\u0026 os) =\u003e\r\n    TypeError: could not convert argument 1\r\n  static bool ogdf::GraphIO::writeGML(const ogdf::Graph\u0026 G, std::ostream\u0026 os) =\u003e\r\n    TypeError: could not convert argument 1\r\n  static bool ogdf::GraphIO::writeGML(const ogdf::GraphAttributes\u0026 A, std::ostream\u0026 os) =\u003e\r\n    SegmentationViolation: segfault in C++; program state was reset\r\n```","author":{"url":"https://github.com/Prezma","@type":"Person","name":"Prezma"},"datePublished":"2023-01-30T11:14:14.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/3/ogdf-python/issues/3"}