How to manually create a boost ptree with XML attributes?
I am using boost libraries to parse XML files and I need to create the ptree manually. I need to add XML attribute to ptree. This is what the acceleration documentation suggests:
ptree pt;
pt.push_back(ptree::value_type("pi", ptree("3.14159")));
This adds an element with content, but I also need to add an attribute to the element.
The above code creates:
<pi>3.14</pi>
I need to add something like this:
<pi id="pi_0">3.14</pi>
What do I need to change to add the attribute id="pi_0"
?
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1 answer
You are using a "fake" node <xmlattr>
: http://www.boost.org/doc/libs/1_46_1/doc/html/boost_propertytree/parsers.html#boost_propertytree.parsers.xml_parser
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/xml_parser.hpp>
#include <iostream>
using boost::property_tree::ptree;
int main() {
ptree pt;
pt.push_back(ptree::value_type("pi", ptree("3.14159")));
pt.put("pi.<xmlattr>.id", "pi_0");
write_xml(std::cout, pt);
}
Printing
<?xml version="1.0" encoding="utf-8"?>
<pi id="pi_0">3.14159</pi>
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