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as snippet.

config1.cpp

/*
 * config1.cpp
 *
 * Author, Copyright: Oleg Borodin <onborodin@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 */
 
 
#include <iostream>
#include <libconfig.hpp>
 
int main(int argc, char **argv) {
 
    libconfig::Config config;
 
    try {
        config.readFile("test.conf");
    } catch (std::exception& e) {
        std::cerr << e.what() << std::endl;
        return 1;
    }
 
    std::string foo = config.lookup("foo");
    std::cout << foo << std::endl;
 
    try {
        libconfig::Setting &setting = config.lookup("");
        int n = setting["list"][2];
        std::cout << n << std::endl;
    } catch (std::exception& e) {
        std::cerr << e.what() << std::endl;
        return 1;
    }
 
    return 0;
}

$ cat test.conf
foo = "bar";
list = (1, 2, 4);

$ ./config1
bar
4