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authorArseny Kapoulkine <arseny.kapoulkine@gmail.com>2017-09-25 19:16:17 -0700
committerArseny Kapoulkine <arseny.kapoulkine@gmail.com>2017-09-25 19:31:18 -0700
commita567f12d76b97c6336b4e3ef34767440182eade6 (patch)
tree756b9b0c9d258ef3f46ec9026d70a78451055529 /tests/test_xpath_operators.cpp
parenta569e6a737714d33fe30284abcc2f1af1f856127 (diff)
Implement move support for xml_document
This change implements the initial version of move construction and assignment support for documents. When moving a document to another document, we always make sure move target is in "clean" state (empty document), and proceed by relocating all structures in the most efficient way possible. Complications arise from the fact that the root (document) node is embedded into xml_document object, so all pointers to it have to change; this includes parent pointers of all first-level children as well as allocator pointers in all memory pages and previous pointer in the first on-heap memory page. Additionally, compact mode makes everything even more complicated because some of the pointers we need to update are stored in the hash table (in fact, document first_child pointer is very likely to be there; some parent pointers in first-level children will be using compact_shared_parent but some won't be) which requires allocating a new hash table which can fail. Some details of this process are not fully fleshed out, especially for compact mode; and this definitely requires many tests.
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