boost_ptree_dangerous_ini_sample.cxx

#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/property_tree/xml_parser.hpp>
#include <boost/property_tree/ini_parser.hpp>

auto main() -> int
{
  using namespace boost::property_tree;
  
  ptree p;
  
  p.put("gk1", 100);
  p.put("gk2", 200);
  
  p.put("a.k1", 123);
  p.put("a.k2", "string");
  p.put("a.k3", 3.45);
  
  p.put("gk1", 10);
  p.put("gk2", 20);
  p.put("gk3", 30);
  
  p.put("b.k1", 3.14f);
  
  p.put("a.k2", "STRING");
  p.put("a.k4", __LINE__);
  
  std::cout << "\n --- JSON --- \n";
  write_json( std::cout, p );
  
  std::cout << "\n --- XML ---\n";
  write_xml( std::cout, p );
  
  std::cout << "\n --- INI ---\n";
  write_ini( std::cout, p );
}

result.txt

 --- JSON --- 
{
    "gk1": "10",
    "gk2": "20",
    "a":
    {
        "k1": "123",
        "k2": "STRING",
        "k3": "3.45",
        "k4": "26"
    },
    "gk3": "30",
    "b":
    {
        "k1": "3.14"
    }
}

 --- XML ---
<?xml version="1.0" encoding="utf-8"?>
<gk1>10</gk1><gk2>20</gk2><a><k1>123</k1><k2>STRING</k2><k3>3.45</k3><k4>26</k4></a><gk3>30</gk3><b><k1>3.14</k1></b>
 --- INI ---
gk1=10
gk2=20
[a]
k1=123
k2=STRING
k3=3.45
k4=26
gk3=30
[b]
k1=3.14