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// ----------------------------------------------------------------------------

// Distributed under the Boost Software License, Version 1.0.

// (See accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

// For more information, see www.boost.org

// ----------------------------------------------------------------------------

#include <boost/property_tree/ptree.hpp>

#include <boost/property_tree/info_parser.hpp>

#include <iostream>

#include <iomanip>

#include <string>

using namespace boost::property_tree;

// Process settings using empty ptree trick. Note that it is considerably simpler

// than version which does not use the "trick"

void process_settings(const std::string &filename)

{

ptree pt;

read_info(filename, pt);

const ptree &settings = pt.get_child("settings", empty_ptree<ptree>());

std::cout << "\n Processing " << filename << std::endl;

std::cout << " Setting 1 is " << settings.get("setting1", 0) << std::endl;

std::cout << " Setting 2 is " << settings.get("setting2", 0.0) << std::endl;

std::cout << " Setting 3 is " << settings.get("setting3", "default") << std::endl;

}

// Process settings not using empty ptree trick. This one must duplicate much of the code.

void process_settings_without_trick(const std::string &filename)

{

ptree pt;

read_info(filename, pt);

if (boost::optional<ptree &> settings = pt.get_child_optional("settings"))

{

std::cout << "\n Processing " << filename << std::endl;

std::cout << " Setting 1 is " << settings.get().get("setting1", 0) << std::endl;

std::cout << " Setting 2 is " << settings.get().get("setting2", 0.0) << std::endl;

std::cout << " Setting 3 is " << settings.get().get("setting3", "default") << std::endl;

}

else

{

std::cout << "\n Processing " << filename << std::endl;

std::cout << " Setting 1 is " << 0 << std::endl;

std::cout << " Setting 2 is " << 0.0 << std::endl;

std::cout << " Setting 3 is " << "default" << std::endl;

}

int main()

{

try

{

std::cout << "Processing settings with empty-ptree-trick:\n";

process_settings("settings_fully-existent.info");

process_settings("settings_partially-existent.info");

process_settings("settings_non-existent.info");

std::cout << "\nProcessing settings without empty-ptree-trick:\n";

process_settings_without_trick("settings_fully-existent.info");

process_settings_without_trick("settings_partially-existent.info");

process_settings_without_trick("settings_non-existent.info");

}

catch (std::exception &e)

{

std::cout << "Error: " << e.what() << "\n";

}

return 0;

}

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