将类存储在boost :: property_tree中

Question

I'm working on a program to record information about the variables within a program. I'd like to group this information by file -> function -> variable.

The boost::property_tree seemed like a good fit for this as I could store an Access object at a path in the tree ( file.function.variable ) and then easily convert the tree to XML, JSON, etc.

Say I'm recording the number of uses of a variable. I can have a class Access that keeps track of the number of writes and reads to a variable. I can then store this object at file.function.variable in the tree. Each time the variable is accessed I can find the variable in the tree and update information about it.

However, I cannot figure out how to store a class in the tree. I assume there is something I need to implement or subclass, but the documentation doesn't address what I'm trying to do.

Is there a solution to my problem? Is there a better alternative to boost::property_tree?

Thank you.

Answer 1

boost::property_tree is designed to hold text data . That's what makes it suitable for exporting to XML, JSON, etc.

Modify your class Access so it includes methods for converting to/from text and store that text in the tree.

Answer 2

You could drop the idea of the tree and just stick with a flat map of key value pairs.

Example:

std::map<std::string, Access> accesses;
// add one access
accesses["file.function.variable"] += 1;

You just need to write a routine that produces the JSON from its content, which should be straightforward. (Assuming the first part of the key is always the file, the second is always the function, the third is always the variable.)