c++ - How to manually create a boost ptree with XML attributes? -

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i've been using boost libraries parse xml files , have create ptree manually. need add xml attribute ptree. boost documentation suggests:

ptree pt; pt.push_back(ptree::value_type("pi", ptree("3.14159")));

that adds element content, need add attribute element.

the code above produces: 

<pi>3.14</pi>

i need add this: 

<pi id="pi_0">3.14</pi>

what need change, add attribute id="pi_0"?

you use "fake" node <xmlattr>: http://www.boost.org/doc/libs/1_46_1/doc/html/boost_propertytree/parsers.html#boost_propertytree.parsers.xml_parser

live on coliru

#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); }

prints

<?xml version="1.0" encoding="utf-8"?> <pi id="pi_0">3.14159</pi>

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