通过程序选项,我正在检查参数的有效组合。但由于某种原因,gpu 参数是一个布尔值,无论我是否在命令行上将其设置为 false,它始终为 true。如果我在命令行上指定 gpu 选项,有没有办法可以为 false?我希望能够创建一个布尔变量来表示是否使用了命令行上的选项。
另外,我找不到关于变量映射的 count() 的任何文档。它是 std::map 函数吗?
部分代码:
namespace po = boost::program_options;
po::options_description desc("Allowed Options");
desc.add_options()
("help,h", "Produce help message")
("remove_database,r",po::value<std::vector<std::string>>
(&remove_database),
"Remove a pre-built database, provide a name(s) of the database")
("gpu,u", po::bool_switch()->default_value(false),
"Use GPU? Only for specific algorithms");
po::variables_map vm;
po::store(po::parse_command_line(argc,argv,desc),vm);
po::notify(vm);
//Processing Cmd Args
bool help = vm.count("help");
bool remove = vm.count("remove_database");
bool gpu = vm.count("gpu");
test(help,"help");
test(remove, "remove");
test(gpu, "gpu");
.....
void test(bool var1, std::string var2){
if(var1)
std::cout << var2 << " is active " << std::endl;
else
std::cout << var2 << " is not active " << std::endl;
Output:
$./a.out -r xx -u off
remove is active
gpu is active
$./a.out -r xx -u false
remove is active
gpu is active