json writer generates invalid output for bool values

[Alessandro Vergani <avergani@…>]

This piece of code should produce the string ( cr and lf removed) { "success" : false }. It wrongly generates { "success" : "false" }

std::ostringstream output;
using namespace boost::property_tree;
ptree pt;
pt.put("success", false);
json_parser::write_json(output, pt);
std::string result = output.str();

[Sebastian Redl]

The ptree typedef of property tree contains strings. Only strings. Therefore, all properties are written out as strings.