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When encountering a token with string data, such as a tag name, the lexer or parser copies the string contents to a heap and stores a reference to the string inside a tree node.To improve parsing performance, pugixml deviates from the typical approach in several ways.When comparing parser performance, a useful metric is the average number of processor cycles spent for each character.While this varies among documents and processor architectures, it is reasonably stable for documents of similar structure.While the techniques were used for an parser, most of them can be applied to parsers of other formats or even unrelated software (e.g., memory management algorithms are widely applicable beyond parsers).Since there are several substantially different approaches to syntax while validating parsers can check data semantics as well).Even a non-validating parser has to do some relatively resource-intensive validation work.
As such, this is a tradeoff between performance and memory usage.
In-place parsing is usually faster compared to parsing with copying strings to the heap, but it can consume more memory.
An in-place parser needs to hold the original stream in memory in addition to its own data describing the document’s structure.
A non in-place parser can store relevant parts of the original stream instead. A conforming parser is expected to perform decoding of the representation.
Since doing this during node object access would make object access performance unpredictable, we prefer to do this at parsing time.