看开源代码 感觉这以后总会用到,写的也简洁
static const char* shortopts = "p:o:m:d:g:b:a:r:x:l:sv"; enum { OPT_HELP = 1, OPT_VERSION, OPT_VALIDATE, OPT_EDGESTATS, OPT_EXACT, OPT_MAXINDEL, OPT_TR, OPT_MAXEDGES }; static const struct option longopts[] = { { "verbose", no_argument, NULL, 'v' }, //NULL 表示getopt_long返回val('v') { "out-prefix", required_argument, NULL, 'o' }, { "min-overlap", required_argument, NULL, 'm' }, { "bubble", required_argument, NULL, 'b' }, { "cut-terminal", required_argument, NULL, 'x' }, { "min-branch-length", required_argument, NULL, 'l' }, { "resolve-small", required_argument, NULL, 'r' }, { "max-divergence", required_argument, NULL, 'd' }, { "max-gap-divergence", required_argument, NULL, 'g' }, { "max-indel", required_argument, NULL, OPT_MAXINDEL }, { "max-edges", required_argument, NULL, OPT_MAXEDGES }, { "smooth", no_argument, NULL, 's' }, { "transitive-reduction", no_argument, NULL, OPT_TR }, { "edge-stats", no_argument, NULL, OPT_EDGESTATS }, { "exact", no_argument, NULL, OPT_EXACT }, { "help", no_argument, NULL, OPT_HELP }, { "version", no_argument, NULL, OPT_VERSION }, { "validate", no_argument, NULL, OPT_VALIDATE}, { NULL, 0, NULL, 0 } };
for (char c; (c = getopt_long(argc, argv, shortopts, longopts, NULL)) != -1;) //不NULL 则返回longopts下表 { std::istringstream arg(optarg != NULL ? optarg : "");//optarg 指向需要val的key 对应的val switch (c) { case 'o': arg >> prefix; break; case 'm': arg >> opt::minOverlap; break; case '?': die = true; break; //需要val 没有传 或 参数不是 -h --help 函数出错返回? case 'v': opt::verbose++; break; case 'l': arg >> opt::trimLengthThreshold; break; case 'b': arg >> opt::numBubbleRounds; break; case 'd': arg >> opt::maxBubbleDivergence; break; case 'g': arg >> opt::maxBubbleGapDivergence; break; case 's': opt::bSmoothGraph = true; break; case 'x': arg >> opt::numTrimRounds; break; case 'r': arg >> opt::resolveSmallRepeatLen; break; case OPT_MAXEDGES: arg >> opt::maxEdges; break; case OPT_TR: opt::bPerformTR = true; break; case OPT_MAXINDEL: arg >> opt::maxIndelLength; break; case OPT_EXACT: opt::bExact = true; break; case OPT_EDGESTATS: opt::bEdgeStats = true; break; case OPT_VALIDATE: opt::bValidate = true; break; case OPT_HELP: std::cout << ASSEMBLE_USAGE_MESSAGE; exit(EXIT_SUCCESS); case OPT_VERSION: std::cout << ASSEMBLE_VERSION_MESSAGE; exit(EXIT_SUCCESS); } }