[boost] trouble with find() in property_tree

Subject: [boost] trouble with find() in property_tree
From: Bernd Prager (bernd_at_[hidden])
Date: 2011-10-23 14:07:39

Hi,

I am experiencing trouble with the find() function in boost::property_tree.
It doesn't seem to catch nested entries.
Statement (1) below finds the child tree, but statement (2) prints 
unexpectedly "false".
That was not what I was expecting. How do I find nested children?

Thanks for any help.
-- Bernd

#include <iostream>
#include <boost/property_tree/ptree.hpp>

namespace pt = boost::property_tree;

int main(void) {
     pt::ptree props;
     pt::ptree const empty;

     props.add("pi", 3.14159);
     props.put("name.first", "bernd");

     std::cout << "find(none): " << (props.find("none") == 
props.not_found() ? "false" : "true") << std::endl;
     std::cout << "find(pi): " << (props.find("pi") == props.not_found() 
? "false" : "true") << std::endl;
     std::cout << "find(name): " << (props.find("name") == 
props.not_found() ? "false" : "true") << std::endl;    // (1)
     std::cout << "find(name.first): " << (props.find("name.first") == 
props.not_found() ? "false" : "true") << std::endl;    // (2)

     return EXIT_SUCCESS;
}