std::function<extension_t*()> extension;
option_parser_t parser;
parser.option(0, "extension", 1, [&](const char* s){extension = find_extension(s);});
std::function<extension_t*()> extension;
option_parser_t parser;
parser.option(0, "extension", 1, [&](const char* s){extension = find_extension(s);});