use BOOST_FOREACH push_back some thing into vector,the first value is blank.

[yuanzhan@…]

When I use BOOST_FOREACH push_back value into std::vector,the first value is blank.After this I have to erase the first element.

[anonymous]

I use BOOST_FOREACH paser a xml document.The xml document like this: <c>

<client>00801038</client> <client>00802980</client> <client>01600817</client>

</client_set>

I ues BOOST_FOREACH like this: std::vector<std::string> ClientSet; BOOST_FOREACH(boost::property_tree::ptree::value_type &v, pt.get_child("client_set"))

ClientSet.push_back(v.second.data());

[Marshall Clow]

This ticket will get more interest if you:

• Post actual code
• Set the component to Boost.Foreach
• Set the "owned by" to the Boost.Foreach maintainer (eric_niebler); ​the list of maintainers

[Eric Niebler]

Please post minimal code that reproduces the error.

[anonymous]

Sorry for reply late. The file name of xml document is "axml.xml".The content of the file like this:

<?xml version="1.0" encoding="UTF-8"?><client_set><client>00801038</client><client>00802980</client><client>01600817</client></client_set>

My code is like this:

std::vector<std::string> ClientSet; ... boost::property_tree::ptree pt; try { boost::property_tree::read_xml("axml.xml",pt); ... BOOST_FOREACH(boost::property_tree::ptree::value_type &v, pt.get_child("client_set"))

ClientSet.push_back(v.second.data());

... } catch(std::exception & e) { }

[Eric Niebler]

I tested the following code against Boost trunk:

#include <iostream>
#include <vector>
#include <string>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/xml_parser.hpp>
#include <boost/foreach.hpp>

int main()
{
    std::vector<std::string> ClientSet; 
    boost::property_tree::ptree pt;
    try
    {
        boost::property_tree::read_xml("C:\\axml.xml",pt); 
        BOOST_FOREACH(
            boost::property_tree::ptree::value_type &v,
            pt.get_child("client_set"))
        {
            ClientSet.push_back(v.second.data());
        }
        std::cout << "client_set size = " << ClientSet.size() << std::endl;
        std::cout << "client_set[0] = " << ClientSet[0] << std::endl;
        std::cout << "client_set[1] = " << ClientSet[1] << std::endl;
        std::cout << "client_set[2] = " << ClientSet[2] << std::endl;
   }
   catch(std::exception & e)
   { }
}

I used a data file C:\axml.xml that contains this:

<?xml version="1.0" encoding="UTF-8"?>
<client_set>
  <client>00801038</client>
  <client>00802980</client>
  <client>01600817</client>
</client_set> 

I get this:

client_set size = 3
client_set[0] = 00801038
client_set[1] = 00802980
client_set[2] = 01600817

Looks ok to me.