if(argc < 3) {

std::cout << "usage: " << argv[0] << " SRC_FILE DEST_FILE" << std::endl;

return 1;

}

// read contents from source and then write it to destination.

file::read(argv[1], [=](const std::string& str, error e){

if(e) {

std::cout << "file::read() failed: " << e.str() << std::endl;

} else {

std::cout << str.length() << " bytes read from: " << argv[1] << std::endl;

file::write(argv[2], str, [=](int nwritten, error e){

if(e) {

std::cout << "file::write() failed: " << e.str() << std::endl;

} else {

std::cout << nwritten << " bytes written to: " << argv[2] << std::endl;

}

});

}

});

return run();