72 lines
2.8 KiB
C++
72 lines
2.8 KiB
C++
// ----------------------------------------------------------------------------
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// Copyright (C) 2002-2006 Marcin Kalicinski
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// For more information, see www.boost.org
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// ----------------------------------------------------------------------------
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#include <boost/property_tree/ptree.hpp>
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#include <boost/property_tree/info_parser.hpp>
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#include <iostream>
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#include <iomanip>
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#include <string>
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using namespace boost::property_tree;
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// Process settings using empty ptree trick. Note that it is considerably simpler
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// than version which does not use the "trick"
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void process_settings(const std::string &filename)
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{
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ptree pt;
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read_info(filename, pt);
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const ptree &settings = pt.get_child("settings", empty_ptree<ptree>());
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std::cout << "\n Processing " << filename << std::endl;
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std::cout << " Setting 1 is " << settings.get("setting1", 0) << std::endl;
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std::cout << " Setting 2 is " << settings.get("setting2", 0.0) << std::endl;
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std::cout << " Setting 3 is " << settings.get("setting3", "default") << std::endl;
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}
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// Process settings not using empty ptree trick. This one must duplicate much of the code.
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void process_settings_without_trick(const std::string &filename)
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{
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ptree pt;
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read_info(filename, pt);
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if (boost::optional<ptree &> settings = pt.get_child_optional("settings"))
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{
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std::cout << "\n Processing " << filename << std::endl;
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std::cout << " Setting 1 is " << settings.get().get("setting1", 0) << std::endl;
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std::cout << " Setting 2 is " << settings.get().get("setting2", 0.0) << std::endl;
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std::cout << " Setting 3 is " << settings.get().get("setting3", "default") << std::endl;
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}
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else
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{
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std::cout << "\n Processing " << filename << std::endl;
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std::cout << " Setting 1 is " << 0 << std::endl;
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std::cout << " Setting 2 is " << 0.0 << std::endl;
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std::cout << " Setting 3 is " << "default" << std::endl;
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}
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}
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int main()
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{
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try
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{
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std::cout << "Processing settings with empty-ptree-trick:\n";
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process_settings("settings_fully-existent.info");
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process_settings("settings_partially-existent.info");
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process_settings("settings_non-existent.info");
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std::cout << "\nProcessing settings without empty-ptree-trick:\n";
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process_settings_without_trick("settings_fully-existent.info");
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process_settings_without_trick("settings_partially-existent.info");
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process_settings_without_trick("settings_non-existent.info");
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}
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catch (std::exception &e)
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{
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std::cout << "Error: " << e.what() << "\n";
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}
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return 0;
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}
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